摘要
采用改良的Hummer法和化学还原法合成了氧化石墨烯(GO)和还原氧化石墨烯(rGO)并将其应用于催化臭氧氧化去除水中阿特拉津(ATZ)和碘帕醇(IOPA)的研究。通过BET、FT-IR、XRD和XPS等多种表征手段对GO和rGO的理化性质进行了全面的探讨,同时探究了pH值、天然有机物、循环次数和自由基抑制剂对GO和rGO催化臭氧性能的影响。试验结果表明,反应15 min后O_(3)/GO和O_(3)/rGO对ATZ的去除率分别可达83.8%和98.3%。此外,rGO在循环试验中展现出更为优越的稳定性。自由基抑制剂试验和XPS结果表明,^(·)OH、^(1)O_(2)和O_(2)^(·-)为催化臭氧反应中的主要活性氧物种,表面羰基和羟基为主要反应活性位点,最后本研究推测了GO和rGO催化臭氧降解污染物可能的反应机制。
Graphene oxide(GO)and reduced graphene oxide(rGO)were synthesized by the modified Hummer and chemical reduction methods,which have been further applied to ozonation system for atrazine(ATZ)and iopamidol(IOPA).The physicochemical properties of GO and rGO were comprehensively explored by various characterizations,including BET,FT-IR,XRD,and XPS.The effects of pH,natural organic matter,cycling times and free radical inhibitors on atrazine(ATZ)elimination in O_(3)/GO and O_(3)/rGO systems were systematically investigated as well.The experimental results revealed that the removal efficiencies of ATZ in O_(3)/GO and O_(3)/rGO systems were 83.8%and 98.3% after 15 min,respectively.In addition,rGO showed superior stability and reusability in the cycling experiments.Free radical inhibitor experiments and XPS results demonstrated that ^(·)OH,^(1)O_(2) and O_(2)^(·-) are the major free radicals accounting for the ATZ degradation,and the surface-carbonyl and hydroxyl groups were regarded as the main reactive sites.Furthermore,the catalytic ozonation mechanisms of GO and rGO for ATZ mitigation were speculated based on the comprehensive characterization and relevant experimental results.
作者
李路森
李海泉
袁向娟
夏东升
LI Lusen;LI Haiquan;YUAN Xiangjuan;XIA Dongsheng(School of Environmental Engineering,Wuhan Textile University,Wuhan 430200,China;Everbright Green and Environmental Protection Solid Waste Disposal(Huangshi)Co.,Ltd.,Huangshi 435000,China;Engineering Research Center for Clean Production of Textile Dyeing and Printings Ministry of Education,Wuhan 430200,China)
出处
《给水排水》
CSCD
北大核心
2022年第6期67-75,共9页
Water & Wastewater Engineering
基金
国家自然科学基金青年项目(51808412)。
