含碳铁泥基催化剂活化H_(2)O_(2)处理亚甲基蓝废水  

Activation of H_(2)O_(2) by carbonaceous iron sludge-derived catalyst for methylene blue wastewater treatment

作　　者：王俩 吴霜 程小双 梁澜 李宁 陈冠益 侯立安[1] WANG Lia;WU Shuang;CHENG Xiaoshuang;LIANG Lan;LI Ning;CHEN Guanyi;HOU Li’an(School of Environmental Science&Engineering,Tianjin University,Tianjin 300350,China;General Water of China Co.,Ltd.,Beijing 100082,China;School of Mechanical Engineering,Tianjin University of Commerce,Tianjin 300134,China)

机构地区：[1]天津大学环境科学与工程学院,天津300350 [2]中环保水务投资有限公司,北京100082 [3]天津商业大学机械工程学院,天津300134

出　　处：《工业水处理》2024年第2期125-132,共8页Industrial Water Treatment

基　　金：天津市自然科学基金(21JCQNJC00400)。

摘　　要：利用铁泥基催化剂构建类Fenton体系可实现污水厂废弃铁泥的资源化利用。热解温度可调控催化剂表面金属和非金属位点组成,影响其对过氧化氢(H_(2)O_(2))的活化效果。对不同热解温度(400~700℃)下制备的催化剂进行形貌、组成、结构和活性等方面的测试。研究发现,700℃下制备的催化剂活化H_(2)O_(2),在100 min内对亚甲基蓝(MB)降解率达92.0%。当热解温度在400~700℃范围内增大时,催化剂比表面积和C含量均增大。机理探究表明,催化剂表面的Fe0、C==C/C—C和C==O活性位点对活化H_(2)O_(2)发挥重要作用,有利于促进亚甲基蓝降解。此外,铁泥基催化剂/H_(2)O_(2)体系中羟基自由基(·OH)和单线态氧(^(1)O_(2))是主要活性物种,超氧自由基(O_(2)^(·-))发挥作用较小。Resource utilization of waste iron sludge from wastewater treatment plants can be achieved by leveraging iron sludge-based catalysts to construct Fenton-like systems.Notably,the pyrolysis temperature modulates the composition of metal and non-metal sites on the catalyst surface,thus affecting the activation of hydrogen peroxide(H_(2)O_(2)).The catalysts prepared at different pyrolysis temperatures(400-700℃)were analyzed in terms of morphology,composition,structure and activity.It was found that the degradation efficiency of methylene blue(MB)could reach 92.0% within 100 min with the activation of H_(2)O_(2) by the catalyst obtained at 700℃.Additionally,the specific surface area and C content of the catalyst increased as the pyrolysis temperature increased from 400℃ to 700℃.The mechanistic investigation revealed that Fe0,C==C/C—C and C==O active sites on the catalyst surface were critical for the activation of H_(2)O_(2),which facilitated MB degradation.Moreover,hydroxyl radicals(·OH)and singlet oxygen(^(1)O_(2))were the dominant active species in the iron sludge-derived catalyst/H_(2)O_(2) system,with superoxide radicals(O_(2)^(·-))playing a minor role.

关 键 词：废弃铁泥 类FENTON 染料废水 

分 类 号：TQ426[化学工程] X703.5[环境科学与工程—环境工程]