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Addressing Background Bias in Explainable Orange Fruit Disease Classification Using Deep Learning 认领 引用
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作者 Naeem Ullah Javed Ali Khan +3 位作者 Michelina Ruocco Antonio Della Cioppa Ivanoe De Falco Giovanna Sannino 《Computers, Materials & Continua》 SCIE EI 2026年第8期1998-2030,共33页
Fruit diseases significantly impact agricultural productivity,yet automated detection systems often fail to provide interpretable predictions and are sensitive to background variations in images,particularly in orange... Fruit diseases significantly impact agricultural productivity,yet automated detection systems often fail to provide interpretable predictions and are sensitive to background variations in images,particularly in orange fruit disease datasets.Current deep learning approaches are prone to background bias,which reduces explainability and generalization.To address this,we propose a deep learning framework that explicitly reduces background noise and bias in orange fruit disease image classification while providing interpretable,pixel-level predictions.The framework integrates existing architectural components,including grouped convolutions with channel shuffling,Leaky ReLU and clipped ReLU activations,and attention-based feature extraction,within a bias-aware design motivated by explainability analysis.The contribution lies in the problem-driven integration of these components and a background standardization preprocessing step to improve explanation reliability.A Grid Search algorithm is used to optimize the hyperparameters.Data augmentation is applied to enhance generalization.We used perceptual hashing to ensure no duplicate images existed between training and testing sets,thereby preventing data leakage and maintaining dataset integrity.For interpretability,we employ Local Interpretable Model-agnostic Explanations(LIME);however,initial explanations highlighted irrelevant background regions.To address this,we introduce a novel preprocessing step using the GrabCut algorithm and morphological operations to standardize image backgrounds,ensuring explanations focus solely on diseased regions.Unlike existing methods,our background standardization technique,based on GrabCut and white background standardization,improves the relevance of LIME explanations by reducing background-focused attributions from 62.2%to 7.7%of cases,while yielding modest,consistent improvements in classification accuracy(0.15%–0.24%).We further evaluate DeepOrangeNet’s feature extraction by classifying its learned representations using six classifiers,including linear discriminant analysis,fine decision tree,Gaussian Naive Bayes,fine k-nearest neighbors,linear support vector machine,and logistic regression,demonstrating its superior adaptability.DeepOrangeNet has been compared with the state-of-the-art methods,proving not only its accuracy but also its explainable and lightweight architecture for real-world agricultural implementation. 展开更多
关键词 Background bias orange fruit disease classification agricultural productivity explainable artificial intelligence deep learning
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基于Orange3的大学生数学建模教学改革探索与实践 认领 引用
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作者 张大庆 《教育教学研究前沿》 2026年第2期65-67,共3页
随着人工智能技术的快速普及,大学生数学建模竞赛中数据分析与机器学习类题目占比逐年提升,传统建模教学模式中专业语言学习成本高、算法实践门槛高的问题日益凸显。本文结合Orange3可视化数据分析工具的功能优势,从教学痛点、工具适配... 随着人工智能技术的快速普及,大学生数学建模竞赛中数据分析与机器学习类题目占比逐年提升,传统建模教学模式中专业语言学习成本高、算法实践门槛高的问题日益凸显。本文结合Orange3可视化数据分析工具的功能优势,从教学痛点、工具适配性、教改路径等方面展开研究,提出基于Orange3的数学建模教学改革方案,旨在降低非数学与计算机专业学生的学习门槛,提升建模效率与算法实践能力,为高校数学建模教学提质增效提供新思路。 展开更多
关键词 数学建模 Orange3 可视化建模 教学改革 机器学习
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Synergistic enhancement of visible-light photocatalytic methyl orange degradation via oxygen vacancy TiO2/Sn3O4 composites 认领 引用
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作者 Cailing Jia Zhanting Zhang +4 位作者 Fuwei Yan Fuyue Liu Yanni Wu Fen Wang Haijiao Xie 《日用化学工业（中英文）》 CAS 北大核心 2026年第2期191-200,共10页
The escalating pace of industrialization has significantly intensified water pollution challenges,for instance,the persistent organic pollutants like methyl orange(MO).Conventional remediation techniques,such as adsor... The escalating pace of industrialization has significantly intensified water pollution challenges,for instance,the persistent organic pollutants like methyl orange(MO).Conventional remediation techniques,such as adsorption and biological degradation,are often hampered by low efficiency and the risk of secondary pollution.Photocatalysis emerges as a promising sustainable alternative;however,the benchmark material titanium dioxide(TiO2)suffers from its intrinsic limitations,notably its wide bandgap energy(≥3.4 eV)restricting its activity to the region of the ultraviolet light and its rapid recombination of photogenerated charge carriers.To overcome these constraints,this research focused on synthesizing novel TiO2/Sn3O4 heterojunction composite photocatalysts via a solvothermal approach.Comprehensive characterization techniques confirmed the successful formation of the composite,which revealed that ultrathin Sn3O4 nanosheets uniformly coated TiO2 nanospheres.This unique architecture effectively reduced the overall crystallinity and introduced the beneficial oxygen vacancies.Under visible-light irradiation(λ≥420 nm),the optimized TiO2/Sn3O4 composite exhibited the exceptional photocatalytic performance,which achieved 96%degradation of MO within just 60 minutes.The calculated apparent kinetic rate constant(0.103 min-1)was remarkably(5.15 times)higher than that of pristine TiO2.ESR experiments identified that hydroxyl radicals(·OH)was the predominant active species driving the degradation.Furthermore,cyclic degradation tests demonstrated its excellent material stability,with the composite retaining 85%of its initial efficiency after four consecutive reuse cycles.This work underscored the synergistic effects within the TiO2/Sn3O4 heterojunction,which significantly enhanced the visible-light absorption,charge separation,and photocatalytic activity,which provided the valuable insights for designing efficient,stable catalysts for the advanced environmental remediation applications. 展开更多
关键词 TiO2/Sn3O4composite visible-light photocatalysis methyl orange degradation oxygen vacancies hydroxyl radicals
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基于Orange集成多机器学习模型的城市周边农地流转价格评估研究——以武汉市为例 认领 引用 被引量：2
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作者 张祚 张跻耀 +1 位作者 晏学丽 廖慧 《中国土地科学》 CSSCI CSCD 北大核心 2025年第5期92-106,共15页
研究目的:探索一种新型的精准、高效且易操作的农地流转价格估价方法,对城市周边农地流转价格实现全局性快速评估,并解析影响因素,为农地流转的科学管理提供技术支撑。研究方法:以武汉市为例,选取多源数据指标为预测因子,基于Orange平台... 研究目的:探索一种新型的精准、高效且易操作的农地流转价格估价方法,对城市周边农地流转价格实现全局性快速评估,并解析影响因素,为农地流转的科学管理提供技术支撑。研究方法:以武汉市为例,选取多源数据指标为预测因子,基于Orange平台,构建多机器学习模型并融合堆叠(Stacking)集成学习的方式,分析城市周边农地流转价格的影响因素并进行价格预测。研究结果:(1)融合多源数据和机器学习的Orange工作流能高效评估精细尺度下的农地流转价格,并具有很好的可解释性和泛化能力。旱地最优模型为自适应提升(AdaBoost)模型,水田最优模型为AdaBoost与随机森林(RF)、极端梯度提升(XGBoost)、K近邻(KNN)模型堆叠的集成学习模型。(2)武汉市农地流转价格的主导影响因素为中心城镇影响度、景观生态多样性指数、农用地经济等指数等,且前两者分别具有显著正向影响和负向影响。(3)武汉市跨城区农地流转价格差异明显,但整体呈现“中心—边缘”递减的空间特征。旱地价格以中高值为主,水田价格以中低值为主,且在局部表现出异质性。研究结论:多源数据预测因子和多机器学习模型的堆叠可以实现武汉市周边农地流转价格的高效评估,而Orange作为可视化编程平台,不但很好支撑了建模过程,并有效降低了建模门槛。未来,积极推动农地流转市场发育的同时,应进一步更新、完善城市农地基准地价评估方法体系。 展开更多
关键词 农地流转价格 地价评估 多机器学习 集成学习模型 Orange
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Remarkable fluorescence enhancement of acridine orange and rhodamine B through immobilization on zirconia nanotube array film and its application on nitrite sensing 认领 引用
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作者 Dong Liu Xixin Wang +1 位作者 Dongxin Liu Jianling Zhao 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第5期26-37,共12页
Zirconia nanotube array films(ZNAF)prepared by anodic oxidation method were used as immobilization materials for acridine orange(AO),rhodamine B(RB)and AO-RB systems.A comparative study on their fluorescence emission ... Zirconia nanotube array films(ZNAF)prepared by anodic oxidation method were used as immobilization materials for acridine orange(AO),rhodamine B(RB)and AO-RB systems.A comparative study on their fluorescence emission intensity,fluorescence resonance energy transfer(FRET)and fluorescence detection of nitrite in aqueous solutions and on immobilization films with ZNAF as carriers was carried out.Results demonstrate that the solution pH values and immobilization on ZNAF have a great influence on the per-formance of these fluorescent molecules.Compared with aqueous solutions,the fluorescence emission in-tensity of AO and RB is considerably increased by immobilization,which is 8.0 and 4.2 times higher than the original,respectively.The energy transfer efficiency(E)of the AO-RB system increases from 40.9%to 84.8%by loading it on ZNAF.Moreover,after immobilization onto ZNAF,the fluorescence detection performance of nitrite is also significantly improved.The limit of detection decreases from 0.95 ng/mL to 0.22 ng/mL and the sensitivity increases from 939.18 to 15,031.68 mL/μg through loading AO onto ZNAF. 展开更多
关键词 ZrO2 nanotube arrays Acridine orange Rhodamine B Nitrite Detection
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Joint transcriptomic and metabolomic analyses reveal the mechanism of flesh transcoloration and orange flesh formation in melon 认领 引用
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作者 Zhongyuan Wang Denghu Cheng +11 位作者 Shihui Yao Siyu Zhang Jiahao Duan Jun Hu Jiafa Wang Yongchao Yang Chao Li Yongqi Wang Xiaozhen Yang Xian Zhang Chunhua Wei Yong Zhang 《Vegetable Research》 2025年第1期258-270,共13页
Flesh color is a critical commodity trait of melon,directly influencing consumer preference and the fruit's market value.This study investigates the crucial role of carotenoids in determining melon flesh coloratio... Flesh color is a critical commodity trait of melon,directly influencing consumer preference and the fruit's market value.This study investigates the crucial role of carotenoids in determining melon flesh coloration by examining color transitions and carotenoid profiles during fruit development in'TianYu'(white flesh)and'TianJu'(orange flesh)melons.Research has demonstrated that the color change in melon flesh results from carotenoid accumulation,withβ-carotene being the primary compound responsible for the formation of orange flesh.Transcriptome analysis revealed that 2,459 and 947 differentially expressed genes(DEGs)were involved in melon pulp color change and orange pulp formation,respectively.Among these DEGs,the study identified and analyzed those related to carotenoid synthesis and metabolism.The results indicated that genes encoding key enzymes for pyruvate synthesis,phytoene synthase(PSY),phytoene desaturase(PDS),and lycopeneβ-cyclase(LCYB)play significant roles in fruit pulp color change and carotenoid accumulation.Notably,the genes encoding PDS(MELO3C017772.2)and LCYB(MELO3C020744.2)were found to be potentially critical genes forβ-carotene synthesis and orange flesh formation.Moreover,functional enrichment analysis of DEGs emphasized the importance of transcriptional regulation and transcription factors such as MYB,WRKY,ERF,and bHLH,whose differential expression during color change suggests their potential to regulate carotenoid pathway genes.This study not only elucidates the molecular mechanisms underlying melon flesh color variation but also reveals the potential regulatory roles of key genes and transcription factors,providing valuable insights for enhancing melon quality,informing breeding strategies,and exploring potential genetic engineering approaches for color manipulation. 展开更多
关键词 fruit development orange flesh formation transcriptomic analysis melon color transitions metabolomic analysis carotenoid profiles flesh transcoloration
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Apples to oranges:environmentally derived,dynamic regulation of serotonin neuron subpopulations in adulthood? 认领 引用
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作者 Christopher J.O’Connell Matthew J.Robson 《Neural Regeneration Research》 SCIE CAS CSCD 2025年第9期2596-2597,共2页
Traumatic brain injury(TBI)is a public health problem with an undue economic burden that impacts nearly every age,ethnic,and gender group across the globe(Capizzi et al.,2020).TBIs are often sustained during a dynamic... Traumatic brain injury(TBI)is a public health problem with an undue economic burden that impacts nearly every age,ethnic,and gender group across the globe(Capizzi et al.,2020).TBIs are often sustained during a dynamic range of exposures to energetic environmental forces and as such outcomes are typically heterogeneous regarding severity and pathology(Capizzi et al.,2020). 展开更多
关键词 sustained orange dynamic
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基于香橙派Orange Pi 5B开发的矿石识别系统 认领 引用
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作者 付琴 林奇兵 常周林 《矿业研究与开发》 CAS 北大核心 2025年第2期254-260,共7页
针对目前矿石检测技术准确性不高、效率低、实时性差以及环境适应性弱等问题,提出了一种基于香橙派的矿石识别系统。该系统利用高清摄像头实时捕获矿石图像,并通过香橙派Orange Pi 5B开发板搭载YOLOv4-tiny-tf2模型处理图像数据,实现矿... 针对目前矿石检测技术准确性不高、效率低、实时性差以及环境适应性弱等问题,提出了一种基于香橙派的矿石识别系统。该系统利用高清摄像头实时捕获矿石图像,并通过香橙派Orange Pi 5B开发板搭载YOLOv4-tiny-tf2模型处理图像数据,实现矿石种类的高效准确识别。结果表明:轻量化的YOLOv4-tiny-tf2模型在不牺牲模型精度的情况下简化了其结构,更适合在配置较低的设备上部署,具备了较高的便携性;相较于传统的人工视觉检测和化学分析方法,基于香橙派Orange Pi 5B的矿石识别系统能够实时识别矿石,识别准确率达到93.75%,具有较高的可靠性和稳定性。 展开更多
关键词 矿石识别系统 香橙派Orange Pi 5B YOLOv4-tiny-tf2 准确率
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基于Orange软件的数据分析应用 认领 引用
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作者 邓伟萍 孙志梅 邱月 《信息与电脑》 2025年第24期220-222,共3页
现代数据分析是一项融合数据处理与人工智能技术进行价值信息挖掘并辅助科学决策的工作。文章基于Orange软件,通过一个心脏病预测的案例展示数据预处理、特征提取、选择机器学习模型、训练与预测、评估整个流程,说明每个流程常用模块功... 现代数据分析是一项融合数据处理与人工智能技术进行价值信息挖掘并辅助科学决策的工作。文章基于Orange软件,通过一个心脏病预测的案例展示数据预处理、特征提取、选择机器学习模型、训练与预测、评估整个流程,说明每个流程常用模块功能与必要参数,并以图形化方式展示结果。通过机器学习模型的对比测试结果,说明模型适用性选择方法。这对学习并应用Orange软件进行深度数据分析具有良好的促进作用。 展开更多
关键词 数据分析 机器学习 Orange
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Structural modifications and applications of orange peel pectin polysaccharides:a review of recent research advances 认领 引用
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作者 Bo-Han Jia Ling-Zhuo An +1 位作者 Xian-Ce Cao Hong-Yu Li 《Traditional Medicine Research》 2025年第8期44-56,共13页
Pectin is a natural polysaccharide with a complex structure consisting of linear and branched regions rich in galacturonic acid.The growing interest in orange peel pectin can be attributed to its abundant supply.Accor... Pectin is a natural polysaccharide with a complex structure consisting of linear and branched regions rich in galacturonic acid.The growing interest in orange peel pectin can be attributed to its abundant supply.According to statistics,about 10 million tons of orange peel waste are produced worldwide each year.Traditionally,the extraction and utilization of pectin have focused on its gelling,thickening,and stabilizing properties in food.However,as more and more research teams have found that pectin has good biocompatibility,biodegradability and easy chemical modification,its potential in drug delivery systems,tissue engineering,and wound healing is gradually being explored.This review focuses on orange peel pectin polysaccharides and discusses its traditional and modern extraction techniques,especially the advanced method of subcritical water extraction.This study also outlines the structural modifications of pectin such as methylation and acetylation,and introduces its antioxidant and anticancer biological activities and their emerging roles in the development of advanced biomaterials such as bone tissue engineering and fibre pad dressings. 展开更多
关键词 orange peel pectin extraction structural modification biomedical applications
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Rapid decolorization of Acid Orange Ⅱ aqueous solution by amorphous zero-valent iron 认领 引用 被引量：12
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作者 Changqin Zhang Zhengwang Zhu +1 位作者 Haifeng Zhang Zhuangqi Hu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2012年第6期1021-1026,共6页
Some problems including low treatment capacity,agglomeration and clogging phenomena,and short working life,limit the application of pre-treatment methods involving zero-valent iron （ZVI）.In this article,ZVI was froz... Some problems including low treatment capacity,agglomeration and clogging phenomena,and short working life,limit the application of pre-treatment methods involving zero-valent iron （ZVI）.In this article,ZVI was frozen in an amorphous state through a melt-spinning technique,and the decolorization effect of amorphous ZVI on Acid Orange II solution was investigated under varied conditions of experimental variables such as reaction temperature,ribbon dosage,and initial pH.Batch experiments suggested that the decolorization rate was enhanced with the increase of reaction temperature and ribbon dosage,but decreased with increasing initial solution pH.Kinetic analyses indicated that the decolorization process followed a first order exponential kinetic model,and the surface-normalized decolorization rate could reach 2.09 L/（m^2 ·min） at room temperature,which was about ten times larger than any previously reported under similar conditions.Recycling experiments also proved that the ribbons could be reused at least four times without obvious decay of decolorization rate and efficiency.This study suggests a tremendous application potential for amorphous ZVI in remediation of groundwater or wastewater contaminated with azo dyes. 展开更多
关键词 amorphous zero-valent iron Acid Orange Ⅱ decolorization surface-normalized decolorization rate recycle amorphous zero-valent iron Acid Orange II decolorization surface-normalized decolorization rate recycle
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Quantification of Flavonoids in Brazilian Orange Peels and Industrial Orange Juice Processing Wastes 认领 引用 被引量：5
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作者 Regina M.S.Pereira Begona Giménez-Cassina Lopez +4 位作者 Susana N.Diniz Alyne Alexandrino Antunes Daniel Moreno Garcia Carlos Rocha Oliveira Maria Cristina Marcucci 《Agricultural Sciences》 2017年第7期631-644,共14页
The flavonoid content in orange peels of different Brazilian citrus varieties such as bahia, lima, lima-of-persian, morcote, pera, ponkan, seleta, cravo, kinkan and pomelo was assessed. Industry processing juice waste... The flavonoid content in orange peels of different Brazilian citrus varieties such as bahia, lima, lima-of-persian, morcote, pera, ponkan, seleta, cravo, kinkan and pomelo was assessed. Industry processing juice wastes such as bagasse, bagasse residues, animal feeding bagasse, pulp WEUE and CORE-wash were also analyzed. The HPLC analysis indicates that the most abundant flavonoids found in these Brazilian citrus peels are hesperidin and naringin. The solvents used are selective for flavonoid extraction, and depending on their polarity, glycoside or aglycone flavonoids are extracted. The use of multivariate analysis shows that DMSO is the best solvent to extract glycosides flavanones while hexane displays high selectivity in the extraction of polymethoxylated flavones. The flavonoids present in the orange wastes, obtained at different stages of the industrial processing, are qualitative and quantitatively different. The identification and quantification of the flavonoid composition in each Brazilian citrus variety were evaluated and allowed the selection of the best solvent for the extraction of each specific class of flavonoids. These compounds were found to be more abundant in the fruit peels than in their juices, revealing their great industrial potential. The residual portion of the processing juices is also rich in flavonoids, depending on the processing step. 展开更多
关键词 Citrus Orange Peel Flavonoid Brazilian Orange Orange Juice Processing Wastes
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Lanthanum and boron co-doped BiVO_4 with enhanced visible light photocatalytic activity for degradation of methyl orange 认领 引用 被引量：13
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作者 王敏 车寅生 +2 位作者 牛超 党明岩 董多 《Journal of Rare Earths》 SCIE EI CAS CSCD 2013年第9期878-884,共7页
BiVO4 photocatalysts co-doped with La and B were prepared by sol-gel method using citric acid as chelate. The samples were characterized by X-ray photoelectron spectroscopy （XPS）, X-ray diffraction （XRD）, scanning... BiVO4 photocatalysts co-doped with La and B were prepared by sol-gel method using citric acid as chelate. The samples were characterized by X-ray photoelectron spectroscopy （XPS）, X-ray diffraction （XRD）, scanning electron microscopy （SEM）, Bru-mauer-Emmett-Teller （BET）, UV-Vis diffuse reflectance spectra （DRS） and the photocatalytic activity was investigated by photo-catalytic degradation of methyl orange （MO）. The results showed that boron and lanthanum ions incorporated into the lattice of BiVO4, and co-doping led to more surface oxygen vacancies, high specific surface areas, small crystallite size, narrow band gap and intense light absorbance in visible region. And the doped La（III） ions could help the separation of photogenerated electrons. Com-pared with BiVO4 and B-BiVO4, the photocatalytic activity of La-B co-doped BiVO4 was remarkably improved due to the synergistic effects of the co-doped ions. The degradation rate of MO in 60 min was 98.4%when La doping content was 0.05 mol.%, which was much higher than that of pure BiVO4（20%） and B-BiVO4（37%）. 展开更多
关键词 La-B-codoped BiVO4 photocatalyst visible light methyl orange solution rare earths
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Effect of harvest time on the chemical composition and antioxidant capacity of Gannan navel orange(Citrus sinensis L. Osbeck 'Newhall')juice 认领 引用 被引量：11
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作者 ZHANG Jun ZHANG Jing-yi +6 位作者 SHAN You-xia GUO Can HE Lian ZHANG Lin-yan LING Wei LIANG Yan ZHONG Ba-lian 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2022年第1期261-272,共12页
The present study investigates the chemical composition and antioxidant capacity of juice from the Gannan navel orange, which is harvested at one-to two-week intervals during the ripening period. The total soluble sol... The present study investigates the chemical composition and antioxidant capacity of juice from the Gannan navel orange, which is harvested at one-to two-week intervals during the ripening period. The total soluble solid(TSS), total polyphenol content(TPC), total flavonoid content(TFC), sucrose and hesperidin contents gradually increase with the ripening of the fruit, followed by slight declines at the late maturity stage. Contrary to these observations, the contents of titratable acid(TA), vitamin C(Vc), and limonin trend downward throughout the ripening period. However, the contents of fructose, glucose, and narirutin fluctuate throughout the harvest time. Three in vitro antioxidant assays consistently indicate that the harvest time exerts no significant influence(P>0.01) on the antioxidant capacity. Furthermore, principal component analysis(PCA) and Pearson’s correlation test are performed to provide an overview of the complete dataset.This study provides valuable information for evaluating the fruit quality and determining when to harvest the fruit in order to meet the preferences of consumers. Meanwhile, our observations suggest that the fruits subjected to juice processing should be harvested at the late maturity stage to alleviate the "delayed bitterness" problem without compromising the antioxidant capacity and the flavonoid content in the juice. 展开更多
关键词 navel orange antioxidant harvest time chemical composition
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Mechanisms of Enhancement of Photocatalytic Properties and Activity of Nd3+-Doped TiO_2 for Methyl Orange Degradation 认领 引用 被引量：10
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作者 侯梅芳 李芳柏 +3 位作者 李瑞丰 万洪富 周国逸 谢克昌 《Journal of Rare Earths》 SCIE EI CAS 2004年第4期542-546,共5页
Nd3+-doped TiO_2 powders were prepared by the sol-gel method. Their crystal pattern and parameter, the specific surface area, the surface chemical state of Ti and the ratio of O/Ti were characterized. The results s... Nd3+-doped TiO_2 powders were prepared by the sol-gel method. Their crystal pattern and parameter, the specific surface area, the surface chemical state of Ti and the ratio of O/Ti were characterized. The results show that Nd impurity hinders the crystal transformation, and decreases the relative intensity of (101) peak. The crystallite sizes of Nd3+-doped TiO_2 powders decrease while their specific surface area increase owing to the Nd3+ doping. The XPS measurement shows that the content of Ti(Ⅲ) and ratio of O/Ti on their surfaces increase significantly with the increase of Nd3+ dosage. The adsorption and photodegradation experiments show that the optimum molar content of Nd3+ is 1.2%. 展开更多
关键词 catalytic chemistry photocatalysis TiO_2 neodymium, methyl orange rare earths
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Amino-functionalized magnetic bacterial cellulose/activated carbon composite for Pb^2+ and methyl orange sorption from aqueous solution 认领 引用 被引量：9
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作者 Xiaogui Huang Xiaozhang Zhan +2 位作者 Cuilian Wen Feng Xu Lijin Luo 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2018年第5期855-863,共9页
A new nanostructured amino-functionalized magnetic bacterial cellulose/activated carbon（BC/AC）composite bioadsorbent（AMBCAC）was prepared for removal of Pb^2＋ and methyl orange（MO）from aqueous solution.The resul... A new nanostructured amino-functionalized magnetic bacterial cellulose/activated carbon（BC/AC）composite bioadsorbent（AMBCAC）was prepared for removal of Pb^2＋ and methyl orange（MO）from aqueous solution.The results demonstrated that the equilibrium adsorption capacity（qe）for Pb^2＋ obviously increases by 2.14 times after introduction of amino groups,the optimum p H for Pb^2＋and MO adsorption was 5.0 and 3.0,respectively,and the qeof AMBCAC was 161.78 mg g^-1 for Pb^2＋ and 83.26 mg g^-1 for MO under the optimal conditions in this investigation.The kinetics and adsorption isotherm data of the sorption process were well fitted by pseudo-second-order kinetic model and Langmuir isotherm respectively.The thermodynamic results（the Gibbs free energy change G〈0,the enthalpy change H〉0,the entropy change S〉0）implied that the adsorption process of Pb^2＋ and MO was feasible,endothermic and spontaneous in nature.These results support that the AMBCAC composite developed in this work can provide a cheap and efficient way for easy removal of both Pb^2＋ and MO as a promising adsorbent candidate for wastewater treatment. 展开更多
关键词 Bacterial cellulose Activated carbon Pb^2＋ Methyl orange Adsorption
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Preparation,characterization of Y3+-doped TiO_2 nanoparticles and their photocatalytic activities for methyl orange degradation 认领 引用 被引量：11
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作者 牛新书 李素娟 +1 位作者 楚慧慧 周建国 《Journal of Rare Earths》 SCIE EI CAS CSCD 2011年第3期225-229,共5页
A series of pure and Y3＋-doped TiO2 nanoparticles with high photocatalytic activities were prepared by a sol-gel method using tetra-n-butyl titanate as precursor.The as-prepared catalysts were characterized by X-ray ... A series of pure and Y3＋-doped TiO2 nanoparticles with high photocatalytic activities were prepared by a sol-gel method using tetra-n-butyl titanate as precursor.The as-prepared catalysts were characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM） and diffuse reflectance spectroscopy（DRS）.The results indicated that yttrium doping could effectively reduce the crystalline size,inhibit the anatase-to-rutile phase transformation and surppress the recombination of the photogenerated electron-hole pairs.The DRS results showed that the optical absorption edge shifted to red direction owing to yttrium ion doping.The photocatalytic activities of samples were evaluated by the photodegradation of methyl orange（MO） aqueous solution under 300 W high pressure mercury lamp irradiation.Photodegradation results revealed that Y3＋ doping could greatly improve the photocatalytic activity of TiO2.In this experiment,the optimal dosage was 1.5 mol.% when samples were calcined at 773 K for 2 h,which caused a MO photodegradation rate of 99.8% under UV irradiation for 70 min. 展开更多
关键词 nano titanium dioxide sol-gel method Y3＋-doping methyl orange photocatalysis rare earths
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Decolorization of Methyl Orange by a new clay-supported nanoscale zero-valent iron:Synergetic effect,efficiency optimization and mechanism 认领 引用 被引量：10
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作者 Xiaoguang Li Ying Zhao +5 位作者 Beidou Xi Xiaoguang Meng Bin Gong Rui Li Xing Peng Hongliang Liu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2017年第2期8-17,共10页
In this study, a novel nanoscale zero-valent iron（n ZVI） composite material was successfully synthesized using a low-cost natural clay, ＂Hangjin 2~#clay＂（HJ clay） as the support and tested for the decolorization... In this study, a novel nanoscale zero-valent iron（n ZVI） composite material was successfully synthesized using a low-cost natural clay, ＂Hangjin 2~#clay＂（HJ clay） as the support and tested for the decolorization of the azo dye Methyl Orange（MO） in aqueous solution by n ZVI particles. According to the characterization and MO decolorization experiments, the sample with 5：1 HJ clay-supported n ZVI（HJ ZVI） mass ratio（HJ-n ZVI5） showed the best dispersion and reactivity and the highest MO decolorization efficiency. With the same equivalent Fe0 dosage, the HJ-n ZVI1 and HJ-n ZVI5 samples demonstrated a synergetic effect for the decolorization of MO： their decolorization efficiencies were much higher than that achieved by physical mixing of HJ clay and n ZVIs, or the sum of HJ clay and n ZVIs alone. The synergetic effect was primarily due to the improved dispersion and more effective utilization of the n ZVI particles on/in the composite materials. Higher decolorization efficiency of MO was obtained at larger HJ-n ZVI dosage, higher temperature and under N2 atmosphere, while the MO initial concentration and p H were negatively correlated to the efficiency. HJ clay not only works as a carrier for n ZVI nanoparticles, but also contributes to the decolorization through an ＂adsorption-enhanced reduction＂ mechanism. The high efficiency of HJ-n ZVI for decontamination gives it great potential for use in a variety of remediation applications. 展开更多
关键词 Nanoscale zero-valent iron Clay Material optimization Methyl Orange
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Electrochemical oxidation of reactive brilliant orange X-GN dye on boron-doped diamond anode 认领 引用 被引量：9
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作者 MA Li ZHANG Ming-quan +4 位作者 ZHU Cheng-wu MEI Rui-qiong WEI Qiu-ping ZHOU Bo YU Zhi-ming 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第8期1825-1835,共11页
In this study,the electrochemical oxidation of reactive brilliant orange X-GN dye with a boron-doped diamond(BDD)anode was investigated.The BDD electrodes were deposited on the niobium(Nb)substrates by the hot filamen... In this study,the electrochemical oxidation of reactive brilliant orange X-GN dye with a boron-doped diamond(BDD)anode was investigated.The BDD electrodes were deposited on the niobium(Nb)substrates by the hot filament chemical vapor deposition method.The effects of processing parameters,such as film thickness,current density,supporting electrolyte concentration,initial solution pH,solution temperature,and initial dye concentration,were evaluated following the variation in the degradation efficiency.The microstructure and the electrochemical property of BDD were characterized by scanning electron microscopy,Raman spectroscopy,and electrochemical workstation;and the degradation of X-GN was estimated using UV-Vis spectrophotometry.Further,the results indicated that the film thickness of BDD had a significant impact on the electrolysis of X-GN.After 3 h of treatment,100%color and 63.2%total organic carbon removal was achieved under optimized experimental conditions:current density of 100 mA/cm2,supporting electrolyte concentration of 0.05 mol/L,initial solution pH 3.08,and solution temperature of 60°C. 展开更多
关键词 reactive brilliant orange X-GN boron-doped diamond film thickness electrochemical oxidation
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Hydrothermal fabrication and visible-light-driven photocatalytic properties of bismuth vanadate with multiple morphologies and/or porous structures for Methyl Orange degradation 认领 引用 被引量：7
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作者 Haiyan Jiang Hongxing Dai +4 位作者 Xue Meng Lei Zhang Jiguang Deng Yuxi Liu Chak Tong Au 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2012年第3期449-457,共9页
Monoclinic BiVO4 with multiple morphologies and/or porous structures were fabricated using the hydrothermal strategy. The materials were characterized by means of the XRD, Raman, TGA/DSC, SEM, XPS, and UV-Vis techniqu... Monoclinic BiVO4 with multiple morphologies and/or porous structures were fabricated using the hydrothermal strategy. The materials were characterized by means of the XRD, Raman, TGA/DSC, SEM, XPS, and UV-Vis techniques. The photocatalytic activities of the BiVO4 materials were evaluated for the degradation of Methyl Orange under visible-light irradiation. It is observed that pH value and surfactant exerted a great effect on the morphology and pore structure of the BiVO4 product. Spherical BiVO4 with porous structures, flower-cluster-like BiVO4, and flower-bundle-like BiVO4 were generated hydrothermally at 100°C with poly（vinyl pyrrolidone） （PVP） and urea （pH = 2） and at 160°C with NaHCO3 （pH = 7 and 8）, respectively. The PVP-derived BiVO4 showed much higher surface areas （5.0-8.4 m2/g） and narrower bandgap energies （2.45-2.49 eV）. The best photocatalytic performance of the spherical BiVO4 material with a surface area of 8.4 m2/g was associated with its higher surface area, narrower bandgap energy, higher surface oxygen vacancy density, and unique porous architecture. 展开更多
关键词 visible-light-driven catalyst porous bismuth vanadate hydrothermal fabrication Methyl Orange degradation photocatalysis
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