以五水硝酸铋、KX(X=Cl、Br、I)、硅藻土为原料,采用直接水解法制备了质量比不同的Bi OX/硅藻土复合光催化剂,并进行了XRD和SEM表征分析,同时采用罗丹明B为目标降解物,以50 W LED紫光/蓝光灯为光源考察了制备光催化剂的可见光光催化性...以五水硝酸铋、KX(X=Cl、Br、I)、硅藻土为原料,采用直接水解法制备了质量比不同的Bi OX/硅藻土复合光催化剂,并进行了XRD和SEM表征分析,同时采用罗丹明B为目标降解物,以50 W LED紫光/蓝光灯为光源考察了制备光催化剂的可见光光催化性能。结果表明BiOX在硅藻土圆筛上成功负载且为片状分级结构,同等条件下,水解体系中1.0 g硅藻土负载Bi OBr得到的复合光催化剂具有最优的光催化性能,在染料初始浓度为15 mg/L,催化剂用量为0.15 g,50 W LED蓝光灯照射50 min的条件下罗丹明B的降解率达到了86.7%。展开更多
In this study, bismuth oxyhalide（Bi OXs（X_Cl, Br, I）） semiconductors were prepared by a simple solvothermal method, with ethanol serving as solvent and a series of tetrabutylammonium halide surfactants as halogen ...In this study, bismuth oxyhalide（Bi OXs（X_Cl, Br, I）） semiconductors were prepared by a simple solvothermal method, with ethanol serving as solvent and a series of tetrabutylammonium halide surfactants as halogen sources. Under identical synthetic conditions, Bi OBr was more readily constructed into regular flower-like hierarchical architectures. The photocatalytic properties of the materials were studied by monitoring the degradation of rhodamine B（Rh B）,with visible light absorption, and colorless salicylic acid（SA）. It was found that both Rh B and SA were rapidly degraded on the surface of Bi OBr. Bi OCl was rather active for the degradation of Rh B,but ineffective toward the degradation of SA. However, neither Rh B nor SA could be degraded effectively in the case of Bi OI. Further experiments such as UV–visible spectroscopy and detection of U OH and O2 Uradicals suggest that the electronic structure of the Bi OX photocatalysts is responsible for the difference in their activities.展开更多
A series of BiOX(X=Cl,Br) were prepared by simple hydrolysis and then calcined at various temperatures and they were characterized by XRD,Raman,SEM,DSC-TGA,BET and UV-Vis.The photocatalytic activity was evaluated by p...A series of BiOX(X=Cl,Br) were prepared by simple hydrolysis and then calcined at various temperatures and they were characterized by XRD,Raman,SEM,DSC-TGA,BET and UV-Vis.The photocatalytic activity was evaluated by photocatalytic degradation of methyl orange(MO) solution under simulated solar light irradiation.The results show that the phase structure,crystallite size,morphology,specific surface area,porous structure,and the absorption band-edges are related to the calcination temperature.For BiOBr,it has completely transformed to Bi24O31Br10 at 600℃ and begins to transform to Bi2 O3 at 800℃.As for BiOCl,it begins to transform to Bi24O31Cl10 at 600℃ and completely transforms to Bi24O31Cl10 at 800℃.Finally,the photocatalytic activity of BiOCl decreases with the temperature increasing owing to decrease of the specific surface areas and pore size,while the photocatalytic activity of BiOBr increases in the first stage and then decreases,which is related to good crystallization and three-dimensional structure.展开更多
The hierarchical BiOX(X=Cl, Br, I) microflowers were successfully synthesized via simple precipitation method at 160 ℃ for 24 h and characterized by XRD, SEM, TEM, UV-vis DRS and N_2 adsorption-desorption techniques....The hierarchical BiOX(X=Cl, Br, I) microflowers were successfully synthesized via simple precipitation method at 160 ℃ for 24 h and characterized by XRD, SEM, TEM, UV-vis DRS and N_2 adsorption-desorption techniques. The as-prepared samples were pure phases and of microflowers composed of nanosheets which intercrossed with each other. The specific surface areas were about 22.9, 17.3 and 16.2 m^2/g for BiOCl, BiOBr and BiOI, respectively. The photocatalytic activities of BiOX powers were evaluated by RhB degradation under UV-vis light irradiation in the order of BiOCl > BiOBr > BiOI. Also, the kinetics of RhB degradation over BiOI was selectively investigated, demonstrating that the kinetics of Rh B degradation follows apparent first-order kinetics and fits the Langmuir-Hinshelwood model.展开更多
以五水硝酸铋、KX(X=Cl、Br、I)、硅藻土为原料,采用水热法合成负载有BiOX(Br、I、Cl)的新型硅藻土光催化材料,并进行了XRD和SEM表征分析,同时采用罗丹明B为目标降解物,以50 W LED紫光/蓝光灯为光源考察了制备光催化剂的可见光光催化性...以五水硝酸铋、KX(X=Cl、Br、I)、硅藻土为原料,采用水热法合成负载有BiOX(Br、I、Cl)的新型硅藻土光催化材料,并进行了XRD和SEM表征分析,同时采用罗丹明B为目标降解物,以50 W LED紫光/蓝光灯为光源考察了制备光催化剂的可见光光催化性能﹒结果表明,制备的Bi OX/硅藻土复合催化剂均有可见光催化活性,PVP辅助条件下制备的BiOI/硅藻土具有最佳的光催化活性,罗丹明B初始浓度15 mg/L,催化剂用量0.15 g,LED蓝光照射50 min,降解率达到96%﹒展开更多
基金supported by the National Natural Science Foundation of China (Nos. 21377067, 21177072, 21207079)Natural Science Foundation for Innovation Group of Hubei Province, China (No. 2009CDA020)open fund (KF2011-07) from the State Key Laboratory of Environmental Chemistry and Ecotoxicology, RCEES, CAS
文摘In this study, bismuth oxyhalide（Bi OXs（X_Cl, Br, I）） semiconductors were prepared by a simple solvothermal method, with ethanol serving as solvent and a series of tetrabutylammonium halide surfactants as halogen sources. Under identical synthetic conditions, Bi OBr was more readily constructed into regular flower-like hierarchical architectures. The photocatalytic properties of the materials were studied by monitoring the degradation of rhodamine B（Rh B）,with visible light absorption, and colorless salicylic acid（SA）. It was found that both Rh B and SA were rapidly degraded on the surface of Bi OBr. Bi OCl was rather active for the degradation of Rh B,but ineffective toward the degradation of SA. However, neither Rh B nor SA could be degraded effectively in the case of Bi OI. Further experiments such as UV–visible spectroscopy and detection of U OH and O2 Uradicals suggest that the electronic structure of the Bi OX photocatalysts is responsible for the difference in their activities.
基金Projects(21676178,21506144,21706179)supported by the National Natural Science Foundation of ChinaProject(2019L0138)supported by the Science and Technology Innovation Program of Higher Education Institutions in Shanxi Province,ChinaProject(201901D211100)supported by the Natural Science Foundation of Shanxi Province for Young Scientists,China
文摘A series of BiOX(X=Cl,Br) were prepared by simple hydrolysis and then calcined at various temperatures and they were characterized by XRD,Raman,SEM,DSC-TGA,BET and UV-Vis.The photocatalytic activity was evaluated by photocatalytic degradation of methyl orange(MO) solution under simulated solar light irradiation.The results show that the phase structure,crystallite size,morphology,specific surface area,porous structure,and the absorption band-edges are related to the calcination temperature.For BiOBr,it has completely transformed to Bi24O31Br10 at 600℃ and begins to transform to Bi2 O3 at 800℃.As for BiOCl,it begins to transform to Bi24O31Cl10 at 600℃ and completely transforms to Bi24O31Cl10 at 800℃.Finally,the photocatalytic activity of BiOCl decreases with the temperature increasing owing to decrease of the specific surface areas and pore size,while the photocatalytic activity of BiOBr increases in the first stage and then decreases,which is related to good crystallization and three-dimensional structure.
基金Project(21301194)supported by the National Natural Science Foundation of ChinaProject(20130162120031)supported by Research Fund for the Doctoral Program of Higher Education of China
文摘The hierarchical BiOX(X=Cl, Br, I) microflowers were successfully synthesized via simple precipitation method at 160 ℃ for 24 h and characterized by XRD, SEM, TEM, UV-vis DRS and N_2 adsorption-desorption techniques. The as-prepared samples were pure phases and of microflowers composed of nanosheets which intercrossed with each other. The specific surface areas were about 22.9, 17.3 and 16.2 m^2/g for BiOCl, BiOBr and BiOI, respectively. The photocatalytic activities of BiOX powers were evaluated by RhB degradation under UV-vis light irradiation in the order of BiOCl > BiOBr > BiOI. Also, the kinetics of RhB degradation over BiOI was selectively investigated, demonstrating that the kinetics of Rh B degradation follows apparent first-order kinetics and fits the Langmuir-Hinshelwood model.
