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    刘乔丹, 李辉, 刘勇弟. 石墨烯介导铁还原菌耦合针铁矿体系降解四氯化碳[J]. 华东理工大学学报(自然科学版), 2024, 50(1): 46-53. DOI: 10.14135/j.cnki.1006-3080.20221209001
    引用本文: 刘乔丹, 李辉, 刘勇弟. 石墨烯介导铁还原菌耦合针铁矿体系降解四氯化碳[J]. 华东理工大学学报(自然科学版), 2024, 50(1): 46-53. DOI: 10.14135/j.cnki.1006-3080.20221209001
    LIU Qiaodan, LI Hui, LIU Yongdi. Degradation of Carbon Tetrachloride by Graphene Mediated Iron-Reducing Bacteria Coupled with Goethite System[J]. Journal of East China University of Science and Technology, 2024, 50(1): 46-53. DOI: 10.14135/j.cnki.1006-3080.20221209001
    Citation: LIU Qiaodan, LI Hui, LIU Yongdi. Degradation of Carbon Tetrachloride by Graphene Mediated Iron-Reducing Bacteria Coupled with Goethite System[J]. Journal of East China University of Science and Technology, 2024, 50(1): 46-53. DOI: 10.14135/j.cnki.1006-3080.20221209001

    石墨烯介导铁还原菌耦合针铁矿体系降解四氯化碳

    Degradation of Carbon Tetrachloride by Graphene Mediated Iron-Reducing Bacteria Coupled with Goethite System

    • 摘要: 研究了氧化石墨烯(GO)、还原氧化石墨烯(rGO)及双氧水改性还原氧化石墨烯(rGO(H2O2))3种石墨烯介导铁还原菌耦合针铁矿体系的铁还原过程以及该体系强化降解四氯化碳的机理。结果表明:不同石墨烯均能有效促进铁还原菌还原针铁矿和铁还原菌耦合针铁矿体系对四氯化碳的降解,其中rGO的促进作用最为显著,其机理主要与石墨烯表面的醌类等基团具有更强的电子传递能力、吸附态Fe(II)浓度高及能生成还原能力强的次生铁矿蓝铁矿等因素有关。

       

      Abstract: Graphene oxide (GO), reduced graphene oxide (rGO) and hydrogen peroxide-modified reduced graphene oxide (rGO (H2O2)) were prepared and their effect on the reduction of Fe (III) in a coupled system of iron-reducing bacteria and iron oxides was studied. The formation of secondary minerals and the electron transfer processes in graphene were investigated. The kinetics of carbon tetrachloride degradation by iron-reducing bacteria and iron oxides mediated by graphene was determined, and the mechanism of carbon tetrachloride degradation by iron-reducing bacteria and iron oxides mediated by graphene was studied by electrochemistry. The results showed that the specific surface area of rGO was the largest, which facilitated the adsorption of iron oxides and organic compounds. Among the different graphenes, rGO and GO had the strongest and weakest electron transfer ability, respectively. H2O2 could reduce the quinone, semiquinone and other redox-active functional groups in graphene, thus compromising the electron transfer ability. All materials effectively assisted iron-reducing bacteria to reduce goethite, with rGO being the most effective on iron reduction of Shiva bacteria. The materials could also promote the degradation of carbon tetrachloride in a coupled system of iron oxides and iron-reducing bacteria, with rGO being the most effective. The mechanism of action was proposed to be the strong electron transfer ability of quinones and other functional groups on the surface of graphene, its larger specific surface area, and the abundance of adsorbed Fe (II) on the surface. In addition, the formation of secondary minerals with a strong reduction ability also contributes to the action.

       

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