Al^(0)-Gr-Fe^(0)活化O_(2)类Fenton氧化降解土霉素的研究  

Oxidative degradation of oxytetracycline by a Fenton-like process with Al^(0)-Gr-Fe^(0) activated of O_(2)

作　　者：陈勇 胡鹭 谭旎 杨昕昱 曾泓文 刘咏[1,2] CHEN Yong;HU Lu;TAN Ni;YANG Xin-yu;ZENG Hong-wen;LIU Yong(College of Chemistry and Materials Science,Sichuan Normal University,Chengdu 610068,China;Key Laboratory of Treatment for Special Wastewater of Sichuan Province Higher Education System,Chengdu 610066,China)

机构地区：[1]四川师范大学化学与材料科学学院,四川成都610068 [2]四川省高校特种废水处理重点试验室,四川成都610066

出　　处：《中国环境科学》2021年第10期4645-4653,共9页China Environmental Science

基　　金：国家自然科学基金资助项目(51878427,51708374)。

摘　　要：采用高能球磨-高温烧结-液相还原法制备了能活化O_(2)原位产生H_(2)O_(2)/·OH的新型功能材料(Al^(0)-Gr-Fe^(0)),通过XRD、SEM、EDS和VSM对Al^(0)-Gr-Fe^(0)进行了表征,探讨了水中土霉素(OTC)在Al^(0)-Gr-Fe^(0)/O_(2)体系中的降解效能和降解途径.结果表明,在初始pH值为6、Al^(0)-Gr-Fe^(0)投加量为2g/L的条件下反应60min后,OTC和TOC的去除率分别达到100.00%和92.93%.循环使用4次后,Al^(0)-Gr-Fe^(0)对OTC的去除率仍有79.27%.通过自由基猝灭试验和自由基捕获试验确定了Al^(0)-Gr-Fe^(0)/O_(2)体系降解OTC的主要活性物种是·OH.Al^(0)-Gr-Fe^(0)/O_(2)体系对OTC的降解归因于:Al^(0)-Gr-Fe^(0)高选择性还原O_(2)为H_(2)O_(2)/·OH;Al^(0)-Gr-Fe^(0)中的Al^(0)还原能促进Fe的循环,从而提高了Fe的催化活性,促进了H_(2)O_(2)分解产生·OH.Fenton oxidation is an effective method to remove antibiotics from aqueous solution.However,there are main disadvantages in the conventional Fenton system.For example,the inconveniences of transport and storage of H_(2)O_(2),the difficulty of recovering the catalyst,and the acidic pH conditions.To address these issues,this project developed a new functional material novel Fenton-like catalyst(Al^(0)-Gr-Fe^(0))capable of activating O_(2) to produce H_(2)O_(2)/•OH in situ was prepared by high energy ball milling-high temperature sintering-liquid phase reduction method.The Al^(0)-Gr-Fe^(0) could activate O_(2) to in-situ produce H_(2)O_(2)/•OH.The Al^(0)-Gr-Fe^(0) was characterized by XRD,SEM,EDS and VSM,respectively.The degradation efficiency and degradation pathways of oxytetracycline(OTC)in water by Al^(0)-Gr-Fe^(0)/O_(2) system were discussed explored.The results showed that the removal efficiencies of OTC and total organic carbon(TOC)were 100.00%and 92.93%,respectively,after 60min reaction at the initial pH of 6,and Al^(0)-Gr-Fe^(0) dosage of 2g/L and reaction time of 60min,the degradation efficiency of OTC and the removal efficiency of TOC were 100.00%and 92.93%,respectively.After 4cycles,the degradation efficiency of OTC by Al^(0)-Gr-Fe^(0) was still decreased to 79.27%after 3 cycles,indicating that Al^(0)-Gr-Fe^(0) had a good reusability.It was proved by free radical scavenge experiments and free radical capture experiments that•OH was the main active species for OTC degradation in Al^(0)-Gr-Fe^(0)/O_(2) system was determined to be•OH by free radical quenching and capture tests.The excellent degradation mechanism ability of OTC degradation by Al^(0)-Gr-Fe^(0)/O_(2) system for OTC was attributed to that Al^(0)-Gr-Fe^(0) the O_(2) could be selectively reduced O_(2) into H_(2)O_(2)/•OH;by Al^(0)-Gr-Fe^(0) and the reduction of Al^(0) in Al^(0)-Gr-Fe^(0) could promote Fe cyclinge,thereby effectively improving the catalytic performance activity of Fe and promoting the decomposition of H_(2)O_(2) to produ

关 键 词：抗生素 土霉素 FENTON氧化 原位产生H_(2)O_(2) 腐蚀电池 

分 类 号：X703[环境科学与工程—环境工程]