Ag_(3)PO_(4)/MIL-125(Ti)Z型异质结的构建及其光催化还原Cr(Ⅵ)的性能  

Synthesis of Z-scheme Ag_(3)PO_(4)/MIL-125(Ti)Heterojunction and Its Performance in Photocatalytic Reduction of Cr(VI)

作　　者：孙玉伟[1,2] 陈畴 祁昕 任楚奇 汤茜 滕洪辉[1,2] 任百祥 SUN Yuwei;CHEN Chou;QI Xin;REN Chuqi;TANG Qian;TENG Honghui;REN Baixiang(College of Engineering,Jilin Normal University,Siping 136000,China;Key Laboratory of Environmental Materials and Pollution Control,Education Department of Jilin Province,Siping 136000,China)

机构地区：[1]吉林师范大学工程学院,四平136000 [2]吉林省高校环境材料与污染控制重点实验室,四平136000

出　　处：《材料研究学报》2023年第11期871-880,共10页Chinese Journal of Materials Research

基　　金：吉林省科技厅项目(YDZJ202201ZYTS368,20210101391JC);吉林省教育厅项目(JJKH20220451KJ,JJKH20230517KJ)。

摘　　要：将Ag_(3)PO_(4)纳米颗粒原位沉积在圆饼状MIL-125(Ti)的表面制备出Ag_(3)PO_(4)/MIL125(Ti)Z型异质结光催化剂,分别用XRD、SEM、EDS、UV-vis、FTIR、EIS和PL等手段表征其晶相结构、形貌特征、光吸收性能、价带结构和电荷分离效率,研究了在模拟太阳光照射下Ag_(3)PO_(4)沉积量不同的Ag_(3)PO_(4)/MIL125(Ti)光催化剂还原Cr(Ⅵ)的性能,以及在光催化过程中初始溶液的p H值和催化剂投加量等的影响。结果表明,Ag_(3)PO_(4)的沉积有效提高了MIL-125(Ti)光催化还原性能。Cr(Ⅵ)溶液初始浓度为10 mg/L、pH为2时,Ag_(3)PO_(4)/MIL-125(Ti)-2对Cr(Ⅵ)的还原率可以达到96.9%。带隙结构计算和自由基捕获实验的结果表明,Ag_(3)PO_(4)/MIL-125(Ti)中的光生载流子符合Z型转移机制。A composite of Z-scheme Ag_(3)PO_(4)/MIL-125(Ti)heterojunction was synthesized by loading Ag_(3)PO_(4)nano particles on the surface of round-shaped MIL-125(Ti).The Ag_(3)PO_(4)/MIL-125(Ti)composite can effectively improve the utilization of light and charge separation efficiency.The crystal-structure,morphology,optical absorption,valence band structure and charge separation efficiency of the prepared Ag_(3)PO_(4)/MIL-125(Ti)composite were characterized by XRD、SEM、EDS、UV-vis、FTIR、EIS and PL testing methods.Under a simulated solar irradiation,the performance of Cr(VI)reduction by Ag_(3)PO_(4)/MIL125(Ti)composite with different deposition amounts of Ag_(3)PO_(4)was studied.Furthermore,the effect of solution pH and catalyst dosage in the photocatalytic reduction process was also discussed.The photocatalytic test results indicated that the deposition of Ag_(3)PO_(4)effectively improved the photocatalytic reduction per-formance of MIL-125(Ti).When the concentration of Cr(VI)solution was 10mg/L and pH was 2,the reduction rate of Cr(VI)by Ag_(3)PO_(4)/MIL-125(Ti)-2 could reach to 96.9%.The results of bandgap structure calculation and free radical trapping experiments show that photon-generated carriers in Ag_(3)PO_(4)/MIL-125(Ti)are conformed to Z-scheme mechanism.

关 键 词：无机非金属材料 MIL-125(Ti) Ag_(3)PO_(4) Z型异质结 光催化 还原Cr(Ⅵ) 

分 类 号：X703.1[环境科学与工程—环境工程]