中南大学学报（自然科学版）2023，Vol.54Issue(11)：4295-4305,11.DOI:10.11817/j.issn.1672-7207.2023.11.008
ZnFe2O4光催化还原Cr(Ⅵ)及其机理研究
Investigation on mechanism of photocatalytic reduction of Cr(Ⅵ)by ZnFe2O4
摘要
Abstract
The leaching residue of ZnFe2O4 produced in the process of traditional zinc hydrometallurgy was used as raw material for photocatalytic reduction of Cr(Ⅵ)after pretreatment.The sample was characterized by XRD,FT-IR,SEM and XPS etc,and its photocatalytic performance was also studied.The effects of reaction time,EDTA dosage,solid-liquid ratio,initial solution concentration and pH on the photocatalytic reduction of Cr(Ⅵ)were investigated.The results show that ZnFe2O4 is a n-type semiconductor with a band gap of 1.71 eV and a conduction band edge(vs.RHE)of 0.01 V,which can theoretically reduce Cr(Ⅵ).Because EDTA can consume holes and form[Cr-EDTA]3+ complex,the effective separation of photogenerated electron hole pairs has greatly improved the performance of ZnFe2O4 in photocatalytic reduction of Cr(Ⅵ).Under the optimal conditions of 0.1 mL EDTA,solid-liquid ratio 1 g/L,and initial solution concentration 20 mg/L,pH=3,the reduction rate of Cr(Ⅵ)by ZnFe2O4 reaches 97.95%within 120 min.关键词
中浸渣/ZnFe2O4/EDTA/光催化/Cr(Ⅵ)还原Key words
leaching residue/ZnFe2O4/EDTA/photocatalytic/Cr(Ⅵ)reduction分类
矿业与冶金引用本文复制引用
王宏斌,侯岳茹,蒋良兴,刘芳洋,贾明,张宗良..ZnFe2O4光催化还原Cr(Ⅵ)及其机理研究[J].中南大学学报（自然科学版）,2023,54(11):4295-4305,11.基金项目
国家重点研发计划项目(2022YFC3900804) （2022YFC3900804）
湖南省自然科学基金资助项目(2022JJ10074)(Project(2022YFC3900804)supported by National Key Research and Development Program of China （2022JJ10074）
Project(2022JJ10074)supported by the Natural Science Foundation of Hunan Province) （2022JJ10074）
