Herein,the catalysts of ultrathin g-C_(3)N_(4)surface-modified hollow spherical Bi2MoO6(g-C_(3)N_(4)/Bi2MoO6,abbreviated as CN/BMO)were fabricated by the co-solvothermal method.The variable valence Mo^(5+)/Mo^(6+)ioni...Herein,the catalysts of ultrathin g-C_(3)N_(4)surface-modified hollow spherical Bi2MoO6(g-C_(3)N_(4)/Bi2MoO6,abbreviated as CN/BMO)were fabricated by the co-solvothermal method.The variable valence Mo^(5+)/Mo^(6+)ionic bridge in CN/BMO catalysts can boost the rapid transfer of photogenerated electrons from Bi2MoO6to g-C_(3)N_(4).And the synergy effect of g-C_(3)N_(4)and Bi2MoO6components remarkably enhance CO_(2)adsorption capability.CN/BMO-2 catalyst has the best performances for visible light-driven CO_(2)reduction compared with single Bi2MoO6and g-C_(3)N_(4),i.e.,its amount and selectivity of CO product are 139.50μmol g-1and 96.88%for 9 h,respectively.Based on the results of characterizations and density functional theory calculation,the photocatalytic mechanism for CO_(2)reduction is proposed.The high-efficient separation efficiency of photogenerated electron-hole pairs,induced by variable valence Mo^(5+)/Mo^(6+)ionic bridge,can boost the rate-limiting steps(COOH*-to-CO*and CO*desorption)of selective visible light-driven CO_(2)conversion into CO.It inspires the establishment of efficient photocatalysts for CO_(2)conversion.展开更多
针对Bi_(2)MoO_(6)光催化剂在光催化反应过程中电子-空穴对分离效率低的问题,以期通过稀土离子掺杂对其光催化性能进行改性.采用溶剂热法合成了系列稀土离子掺杂的Bi_(2)MoO_(6)光催化剂,即为RE3+/Bi_(2)MoO_(6)(RE3+=Tb3+、Sm3+).通过...针对Bi_(2)MoO_(6)光催化剂在光催化反应过程中电子-空穴对分离效率低的问题,以期通过稀土离子掺杂对其光催化性能进行改性.采用溶剂热法合成了系列稀土离子掺杂的Bi_(2)MoO_(6)光催化剂,即为RE3+/Bi_(2)MoO_(6)(RE3+=Tb3+、Sm3+).通过多种分析手段对RE3+/Bi_(2)MoO_(6)材料的组成、结构和形貌进行了表征,并以有机染料罗丹明B(RhB)为模拟污染物,研究了该材料在可见光下的光催化活性.结果表明:稀土Tb3+、Sm3+离子掺杂改性后,样品的比表面积增大,并且对其能带结构、可见光吸收范围均有所调节,光生电子-空穴对的分离效率提高.在可见光下,样品4%Tb3+/Bi_(2)MoO_(6)和4%Sm3+/Bi_(2)MoO_(6)对50 mL 10 mg/L RhB的光降解率均达95%以上,较纯相Bi_(2)MoO_(6)的光催化效率提升了近2倍.展开更多
基金supported by the National Natural Science Foundation of China(21972166)the Beijing Natural Science Foundation(2202045)the National Key Research and Development Program of China(2019YFC1907600)。
文摘Herein,the catalysts of ultrathin g-C_(3)N_(4)surface-modified hollow spherical Bi2MoO6(g-C_(3)N_(4)/Bi2MoO6,abbreviated as CN/BMO)were fabricated by the co-solvothermal method.The variable valence Mo^(5+)/Mo^(6+)ionic bridge in CN/BMO catalysts can boost the rapid transfer of photogenerated electrons from Bi2MoO6to g-C_(3)N_(4).And the synergy effect of g-C_(3)N_(4)and Bi2MoO6components remarkably enhance CO_(2)adsorption capability.CN/BMO-2 catalyst has the best performances for visible light-driven CO_(2)reduction compared with single Bi2MoO6and g-C_(3)N_(4),i.e.,its amount and selectivity of CO product are 139.50μmol g-1and 96.88%for 9 h,respectively.Based on the results of characterizations and density functional theory calculation,the photocatalytic mechanism for CO_(2)reduction is proposed.The high-efficient separation efficiency of photogenerated electron-hole pairs,induced by variable valence Mo^(5+)/Mo^(6+)ionic bridge,can boost the rate-limiting steps(COOH*-to-CO*and CO*desorption)of selective visible light-driven CO_(2)conversion into CO.It inspires the establishment of efficient photocatalysts for CO_(2)conversion.
文摘针对Bi_(2)MoO_(6)光催化剂在光催化反应过程中电子-空穴对分离效率低的问题,以期通过稀土离子掺杂对其光催化性能进行改性.采用溶剂热法合成了系列稀土离子掺杂的Bi_(2)MoO_(6)光催化剂,即为RE3+/Bi_(2)MoO_(6)(RE3+=Tb3+、Sm3+).通过多种分析手段对RE3+/Bi_(2)MoO_(6)材料的组成、结构和形貌进行了表征,并以有机染料罗丹明B(RhB)为模拟污染物,研究了该材料在可见光下的光催化活性.结果表明:稀土Tb3+、Sm3+离子掺杂改性后,样品的比表面积增大,并且对其能带结构、可见光吸收范围均有所调节,光生电子-空穴对的分离效率提高.在可见光下,样品4%Tb3+/Bi_(2)MoO_(6)和4%Sm3+/Bi_(2)MoO_(6)对50 mL 10 mg/L RhB的光降解率均达95%以上,较纯相Bi_(2)MoO_(6)的光催化效率提升了近2倍.
