Photocatalytic reduction of Cr(Ⅵ) over cinder-based nanoneedle in presence of tartaric acid: Synergistic performance and mechanism  

作　　者：Wenwu Yang Zhenfei Yang Luhua Shao Sijian Li Yutang Liu Xinnian Xia 

机构地区：[1]College of Chemistry and Chemical Engineering,Hunan University,Changsha 410082,China [2]Advanced Catalytic Engineering Research Center of the Ministry of Education,Hunan University,Changsha 410082,China [3]College of Environmental Science and Engineering,Hunan University,Lushan South Road,Yuelu District,Changsha 410082,China

出　　处：《Journal of Environmental Sciences》2021年第9期194-204,共11页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos.51672077, 51872089)。

摘　　要：Cr(Ⅵ) is a common heavy metal ion, which will seriously harm human body and environment.Therefore, the removal of Cr(Ⅵ) has become an attractive topic.In this work, cinder was used as a raw material to synthesize a nanoneedle material: γ-(AlOOH@FeOOH)(γ-Al@Fe).The physicochemical properties of γ-Al@Fe were thoroughly characterized, and its effectiveness as a catalyst for photocatalytic reduction of Cr(Ⅵ) was evaluated.The results showed that Cr(Ⅵ) could be efficiently reduced by γ-Al@Fe in the presence of tartaric acid(TA) under visible light.The variable factors on the reaction were investigated in detail, and the results showed that under optimal conditions(γ-Al@Fe 0.4 g/L, TA 0.6 g/L, pH 2), Cr(Ⅵ)was completely reduced within 7 min.Besides, scavenger experiments and EPR proved that O_(2)^(·-) and CO_(2)^(·-) played a significant role in the photocatalytic reduction of Cr(Ⅵ).TA acts as a sacrificial agent to trap the holes and generate strong reducing free radicals: CO_(2)^(·-).Dissolving O_(2) could react with electrons to generate O_(2)^(·-).This work discussed the performance and mechanism of photocatalytic reduction of Cr(Ⅵ) in detail, which provided a new idea for the resource utilization of solid waste and the treatment of heavy metal sewage.

关 键 词：CINDER Tartaric acid Visible light photocatalysis Cr(Ⅵ)removal Reduction mechanism 

分 类 号：X703[环境科学与工程—环境工程]