S型异质结光催化剂ZnFe_(2)O_(4)/WO_(3)的构筑及光催化还原CO_(2)性能

Construction and photocatalytic CO_(2) reduction performance of S-scheme heterojunction ZnFe_(2)O_(4)/WO_(3) catalysts

通过在WO_(3)纳米片表面负载ZnFe_(2)O_(4)纳米颗粒,构建了一系列S型异质结光催化剂ZnFe_(2)O_(4)/WO_(3),并研究了其光催化CO_(2)还原性能。在没有助催化剂和牺牲剂的条件下,所制备的ZnFe_(2)O_(4)/WO_(3)复合材料可对CO_(2)与水蒸汽进行光催化反应。优化后的材料光照5 h后CO_(2)还原产物CO和CH_(4)的产量分别为7.87和4.88μmol·g^(-1)。相对于单相组分,CO和CH_(4)的产量明显提高。光催化活性的提高,归因于ZnFe_(2)O_(4)和WO_(3)异质结的形成以及光生载流子的S型电荷传输模式。

A series of ZnFe_(2)O_(4)/WO_(3) photocatalysts were constructed by loading Zn Fe_(2)O_(4) nanoparticles on the sur-face of WO_(3) nanosheets,and their performance for photocatalytic CO_(2) reduction was studied.Under the conditions of no cocatalysts and sacrificial agents,the prepared ZnFe_(2)O_(4)/WO_(3) composite materials can catalyze the reaction between CO_(2) and water vapor.After illumination for 5 h,the yields of CO_(2) reduction products CO and CH_(4) of the optimal material were 7.87 and 4.88μmol·g^(-1),respectively.Compared to its counterparts,the yields of CO and CH_(4) were improved.The increased photocatalytic activity of Zn Fe_(2)O_(4)/WO_(3) is attributed to the formation of heterojunc-tions between Zn Fe_(2)O_(4) and WO_(3) as well as the S-scheme charge transfer mode of the photogenerated carriers,both of which are conducive to separation efficiency of photo-generated carriers and photocatalytic CO_(2) reduction activity.