Heterojunction engineering is recognized as a promising strategy to modulate the photocatalytic properties of semiconductors.Herein,lead-free Cs2CuBr4perovskite quantum dots(PQDs)were confined in a mesoporous Cu...Heterojunction engineering is recognized as a promising strategy to modulate the photocatalytic properties of semiconductors.Herein,lead-free Cs2CuBr4perovskite quantum dots(PQDs)were confined in a mesoporous CuO framework and a p-n type S-scheme heterojunction of Cs2CuBr4/CuO(CCB/CuO)photocatalyst was fabricated.Experimental characterizations confirmed the effective confinement of the Cs2CuBr4PQDs in the mesoporous CuO framework,which enabled intimate contact in the interface of CCB/CuO heterojunction,thus facilitating the interfacial charge migration and separation between p-type CuO and n-type Cs2CuBr4.Owing to the outstanding charge transport property and CO2adsorption capacity,the developed CCB/CuO heterojunction exhibited remarkably enhanced photocatalytic CO2conversion efficiency with an electron consumption rate(Relectron)of 281.1μmol g-1h-1,which was approximately2.8 times higher than that of pristine Cs2CuBr4.These findings provide some insights into the rational engineering design of lead-free perovskite-based heterostructures for efficient photocatalytic CO2conversion.展开更多
Mesoporous CeO2 was first synthesized by hydrothermal method,and then used to synthesize different contents of CuO)x/CeO2(x:molar ratio of Cu to Ce) by deposition-precipitation method.These materials were characterize...Mesoporous CeO2 was first synthesized by hydrothermal method,and then used to synthesize different contents of CuO)x/CeO2(x:molar ratio of Cu to Ce) by deposition-precipitation method.These materials were characterized by X-ray diffraction(XRD),N2 adsorption and desorption,H2 temperature programmed reduction(H2-TPR) and O2 temperature programmed desorption(O2-TPD) to study the crystal structure,surface area,and the mechanism of CO oxidation.The results show that,on XRD patterns,no evidence of CuO diffraction peaks is present until Cu loading is increased to 20%.The BET surface area decreases noticeably with the increase of Cu content.Compared with other samples,the better reducibility and activity oxygen species of(CuO)10%/CeO2coincide with its better catalytic activity.展开更多
The adsorption of mesoporous Fe3O4–SiO2–TiO2(MFST), which can be separated easily from solution by a magnet, for the removal of methyl orange(MO) was investigated. The nitrogen adsorption–desorption measurement sho...The adsorption of mesoporous Fe3O4–SiO2–TiO2(MFST), which can be separated easily from solution by a magnet, for the removal of methyl orange(MO) was investigated. The nitrogen adsorption–desorption measurement shows successful synthesis of MFST with an average pore size of 3.8 nm and a large specific surface area of55 m2·g-1. About 95% adsorption percentage of MO is achieved with an initial concentration of 10 mg·L-1in the dark and the MFST exhibits superior adsorption ability under acid conditions. The adsorption data fit well with the pseudo-second order model for adsorption. After 4 cycles, the adsorption rate for MO remains 74% in the dark and the MFST can be recovered in a magnetic field with a recovery of about 80 %(by mass). It demonstrates that the samples have significant value on applications of wastewater treatment.展开更多
基金financially supported by Natural Science Foundation of Shanghai(No.22ZR1460700)Shanghai Institute of Technology(No.XTCX2022-28)。
摘要Heterojunction engineering is recognized as a promising strategy to modulate the photocatalytic properties of semiconductors.Herein,lead-free Cs2CuBr4perovskite quantum dots(PQDs)were confined in a mesoporous CuO framework and a p-n type S-scheme heterojunction of Cs2CuBr4/CuO(CCB/CuO)photocatalyst was fabricated.Experimental characterizations confirmed the effective confinement of the Cs2CuBr4PQDs in the mesoporous CuO framework,which enabled intimate contact in the interface of CCB/CuO heterojunction,thus facilitating the interfacial charge migration and separation between p-type CuO and n-type Cs2CuBr4.Owing to the outstanding charge transport property and CO2adsorption capacity,the developed CCB/CuO heterojunction exhibited remarkably enhanced photocatalytic CO2conversion efficiency with an electron consumption rate(Relectron)of 281.1μmol g-1h-1,which was approximately2.8 times higher than that of pristine Cs2CuBr4.These findings provide some insights into the rational engineering design of lead-free perovskite-based heterostructures for efficient photocatalytic CO2conversion.
基金Project(2011FZ030)supported by the Natural Science Foundation of Yunnan Province,ChinaProjects(2011144,2011221)supported by Analysis and Test Foundation of Kunming University of Science and Technology,China
摘要Mesoporous CeO2 was first synthesized by hydrothermal method,and then used to synthesize different contents of CuO)x/CeO2(x:molar ratio of Cu to Ce) by deposition-precipitation method.These materials were characterized by X-ray diffraction(XRD),N2 adsorption and desorption,H2 temperature programmed reduction(H2-TPR) and O2 temperature programmed desorption(O2-TPD) to study the crystal structure,surface area,and the mechanism of CO oxidation.The results show that,on XRD patterns,no evidence of CuO diffraction peaks is present until Cu loading is increased to 20%.The BET surface area decreases noticeably with the increase of Cu content.Compared with other samples,the better reducibility and activity oxygen species of(CuO)10%/CeO2coincide with its better catalytic activity.
基金Supported by the National Natural Science Foundation of China(2011011013-2)the Youth Foundation of Science and Technology Agency of Shanxi Province,China(2011021020-2)
摘要The adsorption of mesoporous Fe3O4–SiO2–TiO2(MFST), which can be separated easily from solution by a magnet, for the removal of methyl orange(MO) was investigated. The nitrogen adsorption–desorption measurement shows successful synthesis of MFST with an average pore size of 3.8 nm and a large specific surface area of55 m2·g-1. About 95% adsorption percentage of MO is achieved with an initial concentration of 10 mg·L-1in the dark and the MFST exhibits superior adsorption ability under acid conditions. The adsorption data fit well with the pseudo-second order model for adsorption. After 4 cycles, the adsorption rate for MO remains 74% in the dark and the MFST can be recovered in a magnetic field with a recovery of about 80 %(by mass). It demonstrates that the samples have significant value on applications of wastewater treatment.