Extremely efficient electro-Fenton-like Sb(Ⅲ) detoxification using nanoscale Ti-Ce binary oxide: An effective design to boost catalytic activity via non-radical pathway  

作　　者：Yifan Ren Yanbiao Liu Fuqiang Liu Fang Li Chensi Shen Zhuangchun Wu 

机构地区：[1]Textile Pollution Controlling Engineering Center of Ministry of Environmental Protection,College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China [2]Shanghai Institute of Pollution Control and Ecological Security,Shanghai 200092,China [3]Institute of Functional Materials,Donghua University,Shanghai 201620,China

出　　处：《Chinese Chemical Letters》2021年第8期2519-2523,共5页中国化学快报（英文版）

基　　金：supported by the Natural Science Foundation of Shanghai,China (No.18ZR1401000)。

摘　　要：Environmental risks posed by discharge of the emerging contaminant antimony(Sb) into water bodies have raised global concerns recently.The toxicity of Sb has been shown to be species-dependent,with Sb(Ⅲ) demonstrating much greater toxicity than Sb(V).Here,we proposed an electrochemical filtration system to achieve rapid detoxification of Sb(Ⅲ) via a non-radical pathway.The key to this technology was an electroactive carbon nanotube filter functionalized with nanoscale Ti-Ce binary oxide.Under an electric field,in situ generated H_(2) O_(2) could react with the Ti-Ce binary oxide to produce hydroperoxide complexes,which enabled an efficient transformation of Sb(Ⅲ) to the less toxic Sb(V)(τ<2 s) at neutral pH.The impact of important operational parameters was assessed and optimized,and system efficacy could be maintained over a wide pH range and long-term operation.An optimum detoxification efficiency of> 90% was achieved using lake water spiked with Sb(Ⅲ) at 500 μg/L.The results showed that Ti/Ce-hydroperoxo surface complexes were the dominant species responsible for the non-radical oxidation of Sb(Ⅲ) based on extensive experimental evidences and advanced characterizations.This study provides a robust and effective strategy for the detoxification of water containing Sb(Ⅲ) and other similar heavy metal ions by integrating state-of-the-art advanced oxidation processes,electrochemistry and nano-filtration technology.

关 键 词：Sb(Ⅲ)detoxification Ti-Ce binary oxide Electro-Fenton-like Non-radical mechanism Continuous flow 

分 类 号：TQ426[化学工程] X703[环境科学与工程—环境工程]