Sulfide oxidation under aerobic conditions can produce active oxygen for the transformation of organic pollutants in aquatic environments.However,the catalytic performance of transition metal-supported carbon material on this process is poor understood.This study found that Co-loaded carbon nanotubes(CNTs)was able to realize the efficient aerobic transformation of antibiotic ciprofloxacin(CIP)by sulfide,with the pseudo-first order reaction rate constant improved from 0.013 h-1 without catalyst to 0.44-0.71 h-1 with 100 mg/L Co-loaded CNTs.Singlet oxygen(1O2)was the main active specie playing key roles in the process of CIP aerobic transformation with presence of Co-loaded CNTs.Mechanism studies indicated that the excellent electron transfer ability of Co-loaded CNTs might play an important role to promote the electron transfer and facilitate the formation of intermediate H2O2 and 1O2.Additionally,the Co-loaded CNTs/sulfide system effectively reduced the acute toxicity of organic pollutant,and Co-loaded CNTs showed remarkable cycling stability and negligible leaching.This study gives a better understanding for the Co-loaded CNTs mediated aerobic antibiotics transformation by sulfide,and provide a reference for the application of Co-loaded carbon materials on organics aerobic transformation by sulfide.
Han-Qing Zhao、Peili Lu、Fei Chen、Chen-Xuan Li、Rui Yan、Yang Mu
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State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China
CAS Key Laboratory of Urban Pollutant Conversion,Department of Environmental Science and Engineering,University of Science and Technology of China,Hefei 230026,China
Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment,College of Environment and Ecology,Chongqing University,Chongqing 400045,China
College of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China
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