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磁性光催化剂TiO2/Ti3C2/Fe3O4的制备及光催化Fenton降解苯胺 认领 引用 被引量：7
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作者 丁小惠 李春虎 +1 位作者 王文泰 王亮 《中国海洋大学学报（自然科学版）》 CAS CSCD 北大核心 2019年第12期67-74,共8页
本文采用共沉淀法制备了磁性TiO2/Ti3C2/Fe3O4 Fenton光催化剂,并通过SEM、TEM、XRD、FT-IR和UV-vis对其微观结构及性能进行了表征,以苯胺为目标降解物,考察了TiO2/Ti3C2/Fe3O4的光降解性能。表征结果表明复合光催化剂饱和磁强度为13.88... 本文采用共沉淀法制备了磁性TiO2/Ti3C2/Fe3O4 Fenton光催化剂,并通过SEM、TEM、XRD、FT-IR和UV-vis对其微观结构及性能进行了表征,以苯胺为目标降解物,考察了TiO2/Ti3C2/Fe3O4的光降解性能。表征结果表明复合光催化剂饱和磁强度为13.88 emu/g,具有较强的顺磁性,可通过外加磁场回收利用。此外,光催化Fenton降解苯胺效率高达91.3%,通过机理分析表明这是因为光催化反应与Fenton反应间存在协同效应,有助于光生电子的转移和OH的产生,从而大幅提高了催化降解苯胺的性能。本文巧妙地将MXene材料与Fenton试剂结合构建光催化Fenton体系,这对新型二维材料MXene的深入研究具有重要意义。 展开更多
关键词 MXene 磁性 TiO2/Ti3C2/Fe3O4 光催化Fenton反应
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溶剂热氧化少层Ti3C2MXene制备二维TiO2/Ti3C2复合光催化剂 认领 引用 被引量：6
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作者 严康 关云锋 +3 位作者 丛野 徐畑祥 朱辉 李轩科 《无机化学学报》 SCIE CAS CSCD 北大核心 2019年第7期1203-1211,共9页
为了改善TiO2光催化剂光生电子-空穴对复合率高、太阳光利用率低的缺陷,采用溶剂热法控制氧化剥离的少层Ti3C2MXene(DL-Ti3C2),制备TiO2/DL-Ti3C2复合光催化剂,并通过降解罗丹明B溶液,研究其光催化性能。结果表明,TiO2/DL-Ti3C2复合光... 为了改善TiO2光催化剂光生电子-空穴对复合率高、太阳光利用率低的缺陷,采用溶剂热法控制氧化剥离的少层Ti3C2MXene(DL-Ti3C2),制备TiO2/DL-Ti3C2复合光催化剂,并通过降解罗丹明B溶液,研究其光催化性能。结果表明,TiO2/DL-Ti3C2复合光催化剂能有效吸收可见光,且光催化性能明显优于DL-Ti3C2和P25。当溶剂热氧化温度为160℃时,复合材料具有最佳的光催化性能。当氧化温度过低时,催化剂中形成的TiO2量不足,产生的光生电子-空穴对数量较少,导致催化剂性能较差;当氧化温度过高时,DL-Ti3C2减少,降低了材料导电性,光生电子-空穴对复合效率高,导致催化剂性能变差。因此,通过改变DL-Ti3C2的氧化温度,可以调控TiO2/DL-Ti3C2复合材料中TiO2和DL-Ti3C2的相对含量,使二者产生协同作用提高复合光催化剂的可见光催化活性。 展开更多
关键词 TiO2/DL-Ti3C2 溶剂热法 光催化 复合材料 协同作用
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Metal-free C(CN)3cooperated with Co–Ti dual sites in bimetallic CoTi-MOF as a tandem photocatalyst for highly efficient C2H4production 认领 引用
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作者 Lijun Xiong Dandan Zhu +4 位作者 Chenglong Qiu Weihong Zeng Mingshi Xu Shanshan Wang Yong Yang 《Green Energy & Environment》 SCIE EI CAS CSCD 2026年第4期1135-1145,共11页
The photocatalytic reduction of carbon dioxide(CO2)into high-value C2+hydrocarbons represents a sustainable pathway to alleviate energy shortages and reduce atmospheric CO2levels.In this study,a unique tandem... The photocatalytic reduction of carbon dioxide(CO2)into high-value C2+hydrocarbons represents a sustainable pathway to alleviate energy shortages and reduce atmospheric CO2levels.In this study,a unique tandem photocatalyst(CoTi-CN)is constructed by integrating bimetallic CoTi-MOF with metal-free half-metallic C(CN)3.This composite demonstrates markedly enhanced activity and selectivity in the photocatalytic CO2reduction to ethylene(C2H4),achieving a C2H4selectivity of 36.8%and a generation yield of 31.3μmol g-1over 5 h.Density functional theory(DFT)calculations combined with in situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)analysis reveal that C(CN)3acts as an efficient CO2to CO converter,while CoTi-MOF favors the adsorption and C-C coupling of*CO intermediates.The spatially decoupled CO generation and C-C coupling processes lead to optimized intermediate coverage and reduced energy barriers,resulting in superior selectivity toward multi-carbon products.This work opens new horizons for the design of tandem photocatalysts that combine half-metallic catalysts with bimetallic MOFs,achieving a significant enhancement in the activity and selectivity of photocatalytic C2H4production. 展开更多
关键词 Tandem catalyst Bimetallic CoTi-MOF Half-metallic C(CN)3 Photocatalytic CO2reduCtion C-C coupling
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Complement C3a Suppresses Spinal Cord Neural Stem Cell Activation by Inhibiting UCHL1 via the NF-κB p65/Nrf2 Pathway 认领 引用
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作者 Lu Ding Xinyue Li +2 位作者 YaQin Guo Feng-Quan Zhou David Y.B.Deng 《Neuroscience Bulletin》 SCIE CAS CSCD 2026年第1期153-174,共22页
Activation of spinal cord neural stem cells(NSCs)and subsequent neurogenesis holds a promising alternative for spinal cord injury(SCI)repair.Our previous study demonstrated that complement C3a,derived from reactive as... Activation of spinal cord neural stem cells(NSCs)and subsequent neurogenesis holds a promising alternative for spinal cord injury(SCI)repair.Our previous study demonstrated that complement C3a,derived from reactive astrocytes,inhibits NSC proliferation by suppressing protein aggregate clearance through the deubiquitinating enzyme ubiquitin carboxy-terminal hydrolase L1(UCHL1)-proteasome system post-SCI.However,the potential molecular mechanism by which C3a modulates NSC activation via this pathway remains unclear.Here,we revealed that C3a/C3a receptor(C3aR)signaling activated NF-κB p65,which in turn inhibited Nrf2 activity and UCHL1 expression,resulting in diminished proteasome activity and the accumulation of protein aggregates,and ultimately impaired NSC activation.Both knockdown of NF-κB p65 and Nrf2 upregulation restored UCHL1 expression and proteasome activity in vitro,promoting NSC activation by enhancing protein aggregate clearance.Mechanistically,we found that NF-κB p65 regulated Nrf2 activity through a dual mechanism:(1)promoting Keap1-dependent ubiquitination and proteasome degradation of Nrf2;(2)inhibiting protein kinase C-mediated Nrf2 phosphorylation and nuclear translocation.Using the dual-luciferase reporter assay and chromatin immunoprecipitation(ChIP)analysis,we further identified UCHL1 as a direct transcriptional target of Nrf2.Importantly,in vivo experiments using SCI mice confirmed that either C3aR blockade,NF-κB p65 knockdown,or Nrf2 overexpression could rescue SCI-induced UCHL1 downregulation.Together,this study uncovers the C3a-NF-κB p65-Nrf2-UCHL1-proteasome axis as a critical regulator of NSC activation after SCI.This may provide novel molecular targets and intervention strategies for SCI repair. 展开更多
关键词 Complement C3a Neural stem cell activation UCHL1 NF-κB p65/Nrf2 pathway Protein aggregation clearance Spinal cord injury
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Preparation of Ni/Ti3O5@graphene oxide double heterojunction for enhancing hydrogen storage in MgH2 认领 引用 被引量：1
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作者 Zexuan Yang Zhendong Ma +4 位作者 Yongjin Zou Cuili Xiang Lixian Sun Yongpeng Xia Yong Shen Chua 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第2期579-591,共13页
Magnesium hydride serves as a promising solid-state hydrogen storage material owing to its high potential.However,its practical applications are constrained by the high enthalpy of hydrogen absorption and slow kinetic... Magnesium hydride serves as a promising solid-state hydrogen storage material owing to its high potential.However,its practical applications are constrained by the high enthalpy of hydrogen absorption and slow kinetics.In this study,we prepared a Ni/Ti3O5@graphene oxide(GO)dual-heterojunction composite material via solvent heating,electrostatic adsorption,and calcination to improve the hydrogen storage capabilities of MgH2.Adding Ni/Ti3O5@GO to MgH2 lowered the initial dehydrogenation temperature of MgH2 to 183℃;at a dehydrogenation temperature of 275℃,6.4 wt.%of H2 escaped from the MgH2 bulk.In addition,the hydrogen storage material absorbed 1.8 wt.%H2 at 30℃ for 30 min.The calculated activation energy of dehydrogenation was 48.221±0.141 kJ·mol-1,which was significantly lower than that of the ball-milled MgH2(112.63±1.44 kJ·mol-1).Mechanistic analysis results revealed that the heterojunction constructed from the multiphase compound system provided a large number of active sites and hydrogen diffusion routes,resulting in a synergistic catalytic effect that enhanced the hydrogen storage capacity of MgH2.In this work,we clarified the compositions of fuzzy interfaces in heterostructured materials by conducting ultraviolet photoelectron spectroscopy tests and identified key composite materials for the formation of heterojunctions. 展开更多
关键词 MGH2 Dual heterojunction Ni/Ti3O5@graphene oxide
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Y2O3对Ti-3Al-5.1Cr-4Fe-0.5Mo合金组织与力学性能的影响 认领 引用
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作者 王振成 高科 +2 位作者 程皓文 闫怡叶 李文慧 《热加工工艺》 CAS 北大核心 2026年第12期188-194,共7页
采用真空电弧熔炼技术制备不同Y2O3含量的Ti-3Al-5.1Cr-4Fe-0.5Mo合金。通过X射线衍射仪、扫描电子显微镜以及电子万能试验机等手段研究了Y2O3含量对合金的微观组织与性能的影响。结果表明,Y2O3/Ti-3Al-5.1Cr-4Fe-0.... 采用真空电弧熔炼技术制备不同Y2O3含量的Ti-3Al-5.1Cr-4Fe-0.5Mo合金。通过X射线衍射仪、扫描电子显微镜以及电子万能试验机等手段研究了Y2O3含量对合金的微观组织与性能的影响。结果表明,Y2O3/Ti-3Al-5.1Cr-4Fe-0.5Mo合金由α-Ti和Y2O3析出相组成,随着Y2O3含量的增加,合金中的Y2O3微纳米相含量逐渐增大,合金的抗拉强度、伸长率均呈现先升高后降低的变化规律。0.2Y2O3/Ti-3Al-5.1Cr-4Fe-0.5Mo合金具有最佳的综合性能,其抗拉强度和伸长率分别高达987 MPa、8.1%,相较于0.1Y2O3/Ti-3Al-5.1Cr-4Fe-0.5Mo合金分别提高24.2%和107.7%。优异的综合性能受益于晶内与晶界强化与微纳米Y2O3的细晶强化协同作用。 展开更多
关键词 Ti-3Al-5.1Cr-4Fe-0.5Mo钛合金 Y2O3 力学性能
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MOF衍生TiO2/C复合材料的制备及其光催化CO2还原性能研究 认领 引用
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作者 黄健勇 纵甜甜 +2 位作者 唐家丽 范劲勇 刘琪 《功能材料》 CAS CSCD 北大核心 2026年第3期107-115,共9页
以MIL-125(Ti)为前驱体,在氩气氛围中煅烧制备了MOF衍生TiO2/C复合材料。该材料成功保留了多孔碳骨架(比表面积为192.14 m2/g),并形成了Ti—O—C界面键(XPS显示C—O峰偏移0.3~0.5 eV)及氧空位(O 1s谱中531.46 eV处存在缺陷峰)。碳骨... 以MIL-125(Ti)为前驱体,在氩气氛围中煅烧制备了MOF衍生TiO2/C复合材料。该材料成功保留了多孔碳骨架(比表面积为192.14 m2/g),并形成了Ti—O—C界面键(XPS显示C—O峰偏移0.3~0.5 eV)及氧空位(O 1s谱中531.46 eV处存在缺陷峰)。碳骨架与氧空位的协同作用使带隙窄化至3.01 eV,显著拓宽了光响应范围;光电测试表明,材料的载流子分离效率得到提升(光电流密度达24.74μA·cm-2,较P25提高40%),电荷转移电阻降低。在光催化CO2还原反应中,该材料的CO产率达434.12μmol/(g·h)(较P25提升12倍),且选择性倾向于CO路径(CH4产率为96.09μmol/(g·h))。机理研究表明锐钛矿/金红石混相异质结驱动电子迁移,Ti—O—C键通过介导电荷转移使碳骨架富集电子活化CO2,氧空位则抑制载流子复合并优化反应路径。三者协同形成"碳骨架-氧空位-Ti—O—C"增效机制,为高效MOF衍生光催化剂设计提供了新范式。 展开更多
关键词 MIL-125(Ti) 衍生TiO2/C 光催化 CO2还原
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Stereodivergent reductive C(sp2)-C(sp3)coupling between cycloketone oximes and vinyl halides enabled by tunable photoredox/Ti dual catalysis 认领 引用
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作者 Huai-Gui Li Can-Ming Zhu +6 位作者 Weidong Yuan Hongyi Chen Zhengyuan Bo Chao Deng Yingguang Zhu Kang Chen Qing-Yuan Meng 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第7期443-451,共9页
The stereodivergent coupling via photoredoxransition metal catalysis has emerged as a powerful tool to construct diverse alkenes in both E and Z configurations.Despite well-established catalytic systems involving late... The stereodivergent coupling via photoredoxransition metal catalysis has emerged as a powerful tool to construct diverse alkenes in both E and Z configurations.Despite well-established catalytic systems involving late transition metals,the early transition metal catalyzed stereodivergent synthesis of alkenes still remains underdeveloped.Herein in this work,a stereodivergent reductive C(sp2)-C(sp3)coupling between cycloketone oximes and vinyl halides has been achieved by tunable photoredox/Ti dual catalysis,providing a facile access to a broad scope of cyano-substituted(fluoro)alkenes with high efficiency and controlled E/Z selectivity.Several products exhibited promising antifungal activities. 展开更多
关键词 Photoredox Ti dual catalysis Stereodivergent Reductive C(sp2)-C(sp³)Coupling Vinyl halides E Z Isomerization
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Hollow tubular In2O3modified carbon nitride for photocatalytic high-yield cleavage of lignin C-C bonds under 395 nm light 认领 引用
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作者 Yixin Li Jianhao Qiu +5 位作者 Guanglu Xia Qiying Liu Biyao Fang Meng Liu Chen Chen Jianfeng Yao 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2026年第4期209-218,共10页
The selective cleavage of Cα-Cβbonds is of great significance to lignin valorization,and photocataly-sis offers an eco-friendly pathway to achieve this process.Here,graphitic carbon nitride(g-C3N4)modifi... The selective cleavage of Cα-Cβbonds is of great significance to lignin valorization,and photocataly-sis offers an eco-friendly pathway to achieve this process.Here,graphitic carbon nitride(g-C3N4)modified with hollow tubular In2O3was constructed via the calcination method for the photocatalytic cleavage of lignin Cα-Cβbonds.MIL-68(In)was used as the precursor of In2O3,imparting a unique hollow tubular structure and a relatively large specific surface area.The hollow tubular structure is helpful for light penetration and scattering,as well as rapid migration of the lignin substrate.The Z-scheme g-C3N4/In2O3heterojunction exhibited 92.1% conversion(corresponding benzaldehyde yield:82.4%)of the lignin model compound 2-phenoxy-1-phenylethanol(PP-ol),outperforming pure In2O3and g-C3N4by 40-and 2.3-fold,respectively,under 395 nm light illumination.By varying the illumination wavelength,the conversion and yields of the g-C3N4/In2O3composites were found to follow wavelength-dependent reactivities.Additionally,photogenerated holes are capable of converting PP-ol into benzoic acid,whereas1O2mainly converts PP-ol into benzaldehyde.This work could encourage the application of metal-organic frameworks in biomass conversion and provide insight into photocatalytic lignin valorization. 展开更多
关键词 Lignin C-C bond cleavage Photocatalysis Metal-organic frameworks g-C3N4 In2O3
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N掺杂TiO2-Fe2O3/C光催化剂的制备及其光催化降解性研究 认领 引用 被引量：2
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作者 李洁 张佳 +1 位作者 陈连喜 吕博 《化工新型材料》 CAS CSCD 北大核心 2025年第2期210-214,共5页
为寻找一种简便且具有良好孔结构的光催化剂合成路径,提升并拓宽其光催化应用范围,通过将N掺杂的双金属Ti-Fe MOFs在500℃的空气气氛中直接热解制备N掺杂TiO2-Fe2O3/C纳米结构。获得的产物显示出独特的树枝状结构,且具有较大... 为寻找一种简便且具有良好孔结构的光催化剂合成路径,提升并拓宽其光催化应用范围,通过将N掺杂的双金属Ti-Fe MOFs在500℃的空气气氛中直接热解制备N掺杂TiO2-Fe2O3/C纳米结构。获得的产物显示出独特的树枝状结构,且具有较大比表面积和良好的介孔结构。同时,红外光谱(FT-IR)和X射线光电子能谱(XPS)结果证实,在空气条件下煅烧后,衍生物仍保留了N和C成分。此外,将制备的N掺杂树枝状双金属结构多孔材料作为光催化剂用于降解亚甲基蓝(MB)染料。结果表明:N掺杂TiO2-Fe2O3/C比N掺杂非Fe参与的TiO2/C和非N非Fe掺杂TiO2/C具有更好的光催化性能,且N掺杂TiO2-Fe2O3/C对MB染料的有效降解率达到81%。 展开更多
关键词 Ti基-MOFs Fe基-MOFs TiO2-Fe2O3/C N掺杂 光催化
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Ti3AlC2-Al对细粒度PcBN合成工艺及性能的影响研究 认领 引用
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作者 周彬 李金玲 +2 位作者 汤黎辉 张世强 栗正新 《超硬材料工程》 CAS 2026年第1期11-16,共6页
PcBN是一种具有高硬度、高热稳定性和化学稳定性的复合超硬材料,是切削铁系黑色金属的理想刀具材料。随着制造业向精密化方向发展,对PcBN的性能要求不断提升。本研究采用0.5μm cBN粉体,通过高温高压烧结法(压力5.5 GPa,功率1 960~2 380... PcBN是一种具有高硬度、高热稳定性和化学稳定性的复合超硬材料,是切削铁系黑色金属的理想刀具材料。随着制造业向精密化方向发展,对PcBN的性能要求不断提升。本研究采用0.5μm cBN粉体,通过高温高压烧结法(压力5.5 GPa,功率1 960~2 380 W,合成时间600 s),以Ti3AlC2-Al为结合剂制备了PcBN。试验结果显示,Ti3AlC2的分解程度随温度升高而增加,2 240 W为完全分解的临界功率。PcBN的最佳烧结功率为2 170 W,此时其密度为3.454 g/cm3,磨耗比为2 953,断裂韧性为12.7 MPa·m1/2,显微硬度HV为3 403.33,综合性能最优。 展开更多
关键词 PCBN 高温高压烧结法 TI3ALC2-AL结合剂 烧结功率 综合性能
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Ti表面Ag/g-C3N4共敏化TiO2纳米膜的构筑及其光电化学行为 认领 引用 被引量：1
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作者 官自超 胡娟 +5 位作者 时海燕 董士刚 刘亚安 王霞 金飘 杜荣归 《金属学报》 SCIE EI CAS CSCD 北大核心 2025年第12期1769-1780,共12页
为提高Ti基体表面TiO2半导体膜的光电化学性能,对不锈钢实施光电化学阴极保护,本工作预先用阳极氧化法在Ti表面构筑TiO2纳米管阵列膜,再依次通过化学气相沉积和化学浴沉积法在阵列膜表面负载类石墨相氮化碳(g-C3N4)和Ag,获... 为提高Ti基体表面TiO2半导体膜的光电化学性能,对不锈钢实施光电化学阴极保护,本工作预先用阳极氧化法在Ti表面构筑TiO2纳米管阵列膜,再依次通过化学气相沉积和化学浴沉积法在阵列膜表面负载类石墨相氮化碳(g-C3N4)和Ag,获得了高性能的Ag/g-C3N4共敏化TiO2纳米管复合膜光阳极。相比于TiO2纳米管膜,经Ag/g-C3N4共敏化后,Ag/g-C3N4/TiO2复合膜的光吸收范围扩展到可见光区,光学性能显著增强。白光照射下,复合膜在含0.2 mol/L NaOH的含50%(体积分数)乙二醇水溶液中的光电流密度达到纯TiO2纳米膜的11倍,表现出优良的光电化学性能。Ti表面Ag/g-C3N4/TiO2纳米管复合膜作为光阳极,可使403不锈钢在0.5 mol/L NaCl溶液中的电极电位相对于自腐蚀电位降低530 mV,光电化学阴极保护效应显著增强,对控制不锈钢腐蚀发挥了良好作用。 展开更多
关键词 Ti 阳极氧化 化学气相沉积 化学浴沉积 TiO2纳米管 g-C3N4 Ag 光电化学阴极保护
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Ti3+自掺杂TiO2纳米管的制备及应用的研究进展 认领 引用
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作者 王艳汝 安雅睿 刘梅川 《理化检验（化学分册）》 CAS CSCD 北大核心 2026年第7期922-928,共7页
TiO2纳米管(TiO2 NTs)具有较高的比表面积和独特的物理化学性质,在能源、环境和传感等领域展现出广阔的应用前景,但存在光吸收范围窄、载流子复合率高等问题,限制了其实际应用。近年来,Ti3+自掺杂TiO2纳米管[Ti(Ⅲ)-TiO2... TiO2纳米管(TiO2 NTs)具有较高的比表面积和独特的物理化学性质,在能源、环境和传感等领域展现出广阔的应用前景,但存在光吸收范围窄、载流子复合率高等问题,限制了其实际应用。近年来,Ti3+自掺杂TiO2纳米管[Ti(Ⅲ)-TiO2 NTs]因其可调节的能带结构和增强的光电性能而受到广泛关注。Ti3+缺陷态的引入降低了TiO2 NTs的带隙宽度,从而拓宽了TiO2 NTs的可见光吸收范围,提高了催化活性和光电性能。为此,系统综述了TiO2 NTs和Ti(Ⅲ)-TiO2 NTs的常用制备方法,简要概述了其结构与性能,并归纳总结了Ti(Ⅲ)-TiO2 NTs在光催化、电化学储能和光电化学等领域的应用进展,同时对未来研究方向进行了展望,以期为解决能源短缺和环境污染等全球性问题提供新的方案参考(引用文献52篇)。 展开更多
关键词 Ti3+自掺杂TiO2纳米管 制备方法 光催化 电化学储能 光电化学
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Ti3C2Tx MXene改性C-TiO2/Cu2O Z型异质结的构建及其光催化降解四环素 认领 引用 被引量：3
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作者 王晓云 范功端 +2 位作者 陈礼洪 牛佳 付爱民 《环境科学学报》 CAS CSCD 北大核心 2025年第12期120-134,共15页
通过煅烧Ti3C2Tx MXene制备C-TiO2,并采用水热法制备Cu2O及不同成分比例的C-TiO2/Cu2O复合光催化材料.同时,对制备的MXene复合材料进行形貌、结构、比表面积和光电特性等表征分析,探讨其对四环素(TC)的光催化降解... 通过煅烧Ti3C2Tx MXene制备C-TiO2,并采用水热法制备Cu2O及不同成分比例的C-TiO2/Cu2O复合光催化材料.同时,对制备的MXene复合材料进行形貌、结构、比表面积和光电特性等表征分析,探讨其对四环素(TC)的光催化降解效能,并考察其光催化活性增强机理.实验结果显示,以450℃煅烧制备的C掺杂TiO2以表面掺杂或负载为主,保持了部分Ti3C2Tx特性,更有利于可见光的吸收.对于50%C-TiO2/Cu2O而言,C掺杂可有效减小TiO2的能带间隙,C-TiO2与Cu2O形成以C层为媒介的Z型异质结构,可有效减小光生e--h+的复合,在pH=7.0时对TC的光催化降解效率为95.5%,其反应速率常数分别是C-TiO2和Cu2O的6.8和4.5倍.经过5次循环重复实验,50%C-TiO2/Cu2O MXene复合材料总体效能与稳定性良好,且在较宽泛pH范围(3~11)内对TC保持优异降解率,具有良好的实际应用前景.淬灭实验及电子顺磁共振测试结果显示,h+是50%C-TiO2/Cu2O降解TC过程中最主要的活性物种,其次为1O2和·O2-.采用密度泛函理论(DFT)计算福井函数(Fukui function)预测了活性物种对TC分子的攻击位置,结合高效液相色谱-质谱联用技术(HPLC-MS)得出TC的光降解过程包括去甲基化、去甲酰化、开环反应、脱水、脱氨基等反应,并最终被氧化为小分子有机物、二氧化碳和水. 展开更多
关键词 Ti3C2TxMXene改性 C-TiO2/Cu2O Z型异质结 四环素 光催化降解机理 密度泛函理论 降解产物
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Aloin blocks the malignant behavior of lung squamous cell carcinoma cells and M2 macrophage polarization by modulating the NR3C2/MT1M axis 认领 引用 被引量：1
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作者 Ying-na Chen Jie-ya Lu +2 位作者 Cheng-feng Gao Zhi-ruo Fang Yan Zhou 《Journal of Integrative Medicine》 SCIE CAS CSCD 2025年第2期195-208,共14页
Objective:Aloin,the main active component in Aloe vera(L.)Burm.f.,has shown promising anti-tumor effects.This study investigated the impact of aloin in lung squamous cell carcinoma(LUSC)and explored its functional mec... Objective:Aloin,the main active component in Aloe vera(L.)Burm.f.,has shown promising anti-tumor effects.This study investigated the impact of aloin in lung squamous cell carcinoma(LUSC)and explored its functional mechanism.Methods:We analyzed the viability,migration,invasion,proliferation,and apoptosis of two LUSC cell lines after treatment with aloin.Target molecules of aloin and downstream target transcripts of nuclear receptor subfamily 3 group C member 2(NR3C2)were predicted by bioinformatics.The biological functions of NR3C2 and metallothionein 1M(MT1M)in the malignant properties of LUSC cells were determined.A co-culture system of LUSC cells with monocyte-derived macrophages was constructed.Mouse xenograft tumor models were generated to analyze the functions of aloin and NR3C2 in the tumorigenic activity of LUSC cells and macrophage polarization in vivo.Results:Aloin suppressed malignant properties of LUSC cells in vitro.However,these effects were negated by the silencing of NR3C2.NR3C2 was found to activate MT1M transcription by binding to its promoter.Additional upregulation of MT1M suppressed the malignant behavior of LUSC cells augmented by NR3C2 silencing.Analysis of the M1 and M2 markers/cytokines in the macrophages or the culture supernatant revealed that aloin treatment or MT1M overexpression in LUSC cells enhanced M1 polarization while suppressing M2 polarization of macrophages,whereas NR3C2 silencing led to reverse trends.Consistent findings were reproduced in vivo.Conclusion:This study demonstrated that aloin activates the NR3C2/MT1M axis to suppress the malignant behavior of LUSC cells and M2 macrophage polarization.Please cite this article as:Chen YN,Lu JY,Gao CF,Fang ZR,Zhou Y.Aloin blocks the malignant behavior of lung squamous cell carcinoma cells and M2 macrophage polarization by modulating the NR3C2/MT1M axis. 展开更多
关键词 Aloin NR3C2 MT1M Macrophages Lung squamous cell carcinoma
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Ti3C2Tx包覆钛酸锂电极的电化学性能研究 认领 引用
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作者 刘敬敬 袁志成 《塑料科技》 CAS 北大核心 2026年第8期36-42,共7页
为改善钛酸锂(LTO)电极的导电性和倍率性能,采用化学气相沉积(CVD)与表面接枝改性相结合的方法,制备不同质量分数MXene(Ti3C2Tx)包覆的LTO复合电极。X射线衍射(XRD)与场发射透射电子显微镜(TEM)结果表明,MXene以二维片层均匀包覆于LTO... 为改善钛酸锂(LTO)电极的导电性和倍率性能,采用化学气相沉积(CVD)与表面接枝改性相结合的方法,制备不同质量分数MXene(Ti3C2Tx)包覆的LTO复合电极。X射线衍射(XRD)与场发射透射电子显微镜(TEM)结果表明,MXene以二维片层均匀包覆于LTO颗粒表面,未改变尖晶石相结构,同时构建了连续导电网络。循环后扫描电子显微镜(SEM)形貌显示,MXene包覆显著抑制颗粒开裂并增强结构完整性。热重分析(TG)显示,包覆有效抑制LTO的逐步热分解,同时提升残留率。热逸走分析(TR)表明,包覆降低材料的起始分解温度。电化学测试结果显示,4%的MXene包覆的LTO复合电极具有最佳综合性能,其电荷转移电阻(Rct)由158.22Ω降至86.31Ω,锂离子扩散系数(DLi+)提升至4.56×1015 cm2/s,库仑效率(CE)提高至63.91%。在1.0 C倍率下容量保持率达94.07%,远高于未包覆样品的69.95%。MXene包覆显著提升循环稳定性和倍率性能。MXene包覆通过构建稳定的电子、离子协同传输通道和增强界面结合,实现LTO电极在结构稳定性、导电性及循环性能上的综合优化。研究为高功率锂离子电池中的高性能负极材料的设计提供新思路。 展开更多
关键词 钛酸锂 Ti3C2Tx包覆 电化学性能 晶体结构变化
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Effect of Cr2O3/Cr3C2additions on mechanical and tribological properties of Ti(C,N)-based cermets 认领 引用
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作者 Mei-ling LIU Ya-jing CAO +1 位作者 Wan-xiu HAI Yu-hong CHEN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2025年第2期525-537,共13页
Cr2O3was used as grain inhibitor in Ti(C,N)-based cermets with vacuum sintering.The microstructure and mechanical and tribological properties of cermets with Cr2O3and Cr3C2were investigated.The resul... Cr2O3was used as grain inhibitor in Ti(C,N)-based cermets with vacuum sintering.The microstructure and mechanical and tribological properties of cermets with Cr2O3and Cr3C2were investigated.The results show that adding Cr2O3promotes a gray core/gray rim structure formation and finer size of Ti(C,N)hard phase.Compared with the cermet with an equal Cr3C2addition,the cermet with 0.6 wt.%Cr2O3exhibits 16.5%higher transverse rupture strength.This enhancement is likely due to the smaller lattice misfit at the coreim interface and more uniform Cr distribution in the binder.Additionally,at room temperature(25℃)and 800℃,Cr2O3-containing cermets demonstrate lower coefficients of friction and volume wear ratios than Cr3C2-containing cermets,with the wear ratio difference reaching an order of magnitude.Scanning electron microscopy and X-ray photoelectron spectroscopy results further confirm more oxidation wear in Cr2O3-containing cermets than in Cr3C2-containing cermets. 展开更多
关键词 Ti(C,N) Cr2O3 grain inhibitor mechanical properties tribological properties
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circNR3C2 promotes chondrogenic differentiation and cartilage repair of human adipose-derived stem cells via the hsa-miR-647/SOX9 pathway 认领 引用
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作者 Dabiao Hou Huajun Wang +3 位作者 Hao Guo Dongbin Luo Xiaofei Zheng Simin Luo 《Animal Models and Experimental Medicine》 CAS CSCD 2025年第12期2209-2221,共13页
Background:Human adipose-derived stem cells(hADSCs)are seed cells with application prospects in cartilage repair.However,the mechanism of hADSC chondrogenic differentiation is still unclear.This study identifies a nov... Background:Human adipose-derived stem cells(hADSCs)are seed cells with application prospects in cartilage repair.However,the mechanism of hADSC chondrogenic differentiation is still unclear.This study identifies a novel circRNA,circNR3C2,which is significantly upregulated during the chondrogenic differentiation of hADSCs.Methods:To analyze their role in hADSC chondrogenic differentiation,hADSCs were separated and identified by flow cytometry.Thereafter,we conducted Alcian Blue staining to assess chondrogenic differentiation levels.Additionally,RT-qPCR was carried out to detect levels of the cartilage-related genes COL2,Aggrecan and SOX9.Moreover,overlapping target SOX9 and circNR3C2 miRNAs were detected by bioinformatics and luciferase analyses.Finally,the role of circNR3C2 was confirmed in vivo using animal models.Results:We confirmed that the cell surface receptors CD44,CD90 and CD105 were positively expressed on hADSCs,and their cartilage differentiation levels dramatically increased after 2 weeks.Expression of the cartilage-related genes COL2 and Aggrecan and circNR3C2 also markedly increased.CircNR3C2 overexpression enhanced cartilage differentiation of hADSCs,while up-regulating COL2,SOX9 and Aggrecan.Bioinformatics analysis identified hsa-miR-647 as the target miRNA of circ-NR3C2 and SOX9.Hsa-miR-647 overexpression in hADSCs can antagonize the effect of circNR3C2 on chondrogenic differentiation,and reverse its effect on regulating the expression of COL2,Aggrecan,and SOX9.We also showed that hADSCs overexpressing circNR3C2 promote cartilage repair in vivo.Conclusions:We show that circNR3C2 modulates SOX9 expression to promote hsamiR-647-mediated hADSC chondrogenic differentiation;targeting circNR3C2 may help to develop new treatments to manage cartilage-related disorders. 展开更多
关键词 cartilage repair chondrocyte differentiation circNR3c2 hADSCs hsa-miR-647 SOX9
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过渡金属Zn2+表面修饰Ti3C2Tx Mxene构筑高性能超级电容器负极 认领 引用
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作者 杨力豪 《材料科学》 2026年第3期85-92,共8页
Ti3C2Tx Mxene因其独特的理化特性,被广泛认为是高性能超级电容器的有前景的负极材料。然而,其储能潜力受限于固有缺陷,如层间堆叠问题及存在不利的-F表面端基。本研究报道了一种调控并提升Ti3C2Tx电化学性能的表面修饰策略。采用离子... Ti3C2Tx Mxene因其独特的理化特性,被广泛认为是高性能超级电容器的有前景的负极材料。然而,其储能潜力受限于固有缺陷,如层间堆叠问题及存在不利的-F表面端基。本研究报道了一种调控并提升Ti3C2Tx电化学性能的表面修饰策略。采用离子交换法将Zn2+离子嵌入Ti3C2Tx的层间间隙,有效扩展了离子扩散路径并暴露更多活性位点。经此结构调控后,所得Ti3C2Tx-Zn薄膜电极在1 A·g−1的电流密度下比电容高达361 F·g−1,较原始Ti3C2Tx薄膜电极(242 F·g−1)提升1.43倍;电流密度升至20 A·g−1时电容保持率为85%,10 A·g−1电流密度下1万次循环后容量保持率高达99.8%,展现出优异倍率性能与良好的循环稳定性。本研究通过层间工程优化Ti3C2Tx表面组分与结构,为过渡金属离子表面修饰MXene材料在超级电容器中的应用提供了科学依据与技术参考。 展开更多
关键词 超级电容器 负极 Ti3C2Tx 插层 表面修饰
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Inhibition of the Arp2/3 Complex Attenuates Angiotensin Ⅱ-Induced Cardiomyocyte Hypertrophy 认领 引用
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作者 LING Li PAN Cong-Bin +2 位作者 WAN Lu-Xuan YANG Zhuang-Zhuang REN Zhan-Hong 《中国生物化学与分子生物学报》 CAS CSCD 北大核心 2025年第9期1332-1341,I0003-I0007,共10页
Pathological cardiac hypertrophy is an early and significant cardiac structural characteristic that contributes to the onset and progression of heart failure(HF).Its mainly structural feature is the abnormally enlarge... Pathological cardiac hypertrophy is an early and significant cardiac structural characteristic that contributes to the onset and progression of heart failure(HF).Its mainly structural feature is the abnormally enlarged cardiomyocyte.Effective intervention targets for abnormally enlarged cardiomyocyte remain to be identified.Previous studies have shown that the cellular shape and size can be regulated by the actin related protein 2/3(Arp2/3)complex,which is an actin-binding protein complex involved in the actin nucleation and assembly.However,the roles of the Arp2/3 complex in cardiomyocyte hypertrophy remain unknown.Here our study identifies its novel roles in the occurrence and development of cardiomyocyte hypertrophy.We found that mRNA levels of all subunits from the Arp2/3 complex are significantly upregulated(P<0.05)in the angiotensin Ⅱ(Ang Ⅱ)-induced neonatal rat primary and H9c2 cardiomyocyte hypertrophy.Further studies showed that siRNA-directed ARPC 2 silencing inhibits the reactivation of fetal genes and enlargement of cardiomyocyte area induced by Ang Ⅱ in neonatal rat primary cardiomyocytes(NRCMs)and H9c2 cells(P<0.05).In addition,the upstream activators of the Arp2/3 complex including SH3 protein interacting with Nck,90 kD(SPIN90)and Ras-related C3 botulinum toxin substrate 1(Rac1)/WASp family Verprolin-homologous protein-2(WAVE-2)are upregulated(P<0.05)in Ang Ⅱ-induced neonatal rat primary and H9c2 cardiomyocyte hypertrophy,indicating the excessive activation of the Arp2/3 complex.We further show that CK666,a specific Arp2/3 complex inhibitor,prevents the reactivation of fetal genes and the enlargement of cardiomyocyte area induced by Ang Ⅱ in NRCMs and H9c2 cells(P<0.05).Our results reveal that the Arp2/3 complex plays a crucial role in Ang Ⅱ-induced cardiomyocyte hypertrophy,which is beneficial to further studies about the molecular mechanisms by which the Arp2/3 complex regulates pathological cardiac hypertrophy. 展开更多
关键词 cardiomyocyte hypertrophy Arp2/3 complex angiotensinⅡ(AngⅡ) neonatal rat primary cardiomyocytes(NRcMs) H9c2 cells
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