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氧化石墨烯改性污泥基生物炭对培氟沙星的去除机理研究
郑永昕1, 魏东宁1, 余学2, 黄刘辉1, 胡辉美1, 黄红丽1
1.湖南农业大学 资源环境学院;2.广东家宝城市管理科技有限公司
摘要:
为获得培氟沙星废水高效去除的环境友好型吸附剂,以城市剩余污泥为原料制备了SBC(污泥基生物炭),并采用氧化石墨烯对其改性得到GO-SBC(氧化石墨烯改性生物炭),利用SEM和FTIR对其进行表征,通过静态吸附试验探讨了生物炭对培氟沙星的去除效果,并通过吸附模型和FTIR、XPS表征技术进一步探究了GO-SBC对培氟沙星的吸附机理。结果表明:①改性后的GO-SBC表面更加粗糙,生物炭表面含氧官能团数量增加。②动力学吸附研究表明,GO-SBC对培氟沙星的最大吸附容量为137.51 mg/g,比SBC对培氟沙星的吸附容量提高了40.32%,且GO-SBC对培氟沙星的吸附更符合伪二级动力学方程,表明吸附过程主要以化学吸附为主。③GO-SBC对培氟沙星的吸附符合Freundlich等温吸附模型,表明该吸附过程为多层吸附。④热力学研究表明吸附过程为自发吸热反应。⑤GO-SBC对培氟沙星的吸附机制主要有两种作用,一种是π-π相互作用,另一种是GO-SBC的N—H与培氟沙星的C—H相互作用。研究显示, GO-SBC是一种高效去除培氟沙星的吸附剂,这为城市剩余污泥的资源化利用提供了出路,也为抗生素废水治理提供了方法。
关键词:  氧化石墨烯  生物炭  培氟沙星  吸附机理
DOI:
分类号:
基金项目:湖南省教育厅优秀青年项目(17B119),湖南省重点研究计划项目(2018SK2022)
Removal mechanism of pefloxacin by graphene oxide modified sludge based biochar
,et al
Abstract:
In order to obtain an environmentally friendly adsorbent for the efficient removal of pefloxacin in wastewater, SBC (sludge-based biochar) was prepared from urban surplus sludge and modified with graphene oxide to obtain GO-SBC (graphene oxide modified biochar). Their characterization was carried out through various SEM and FTIR techniques. Furthermore, the removal efficiency of biochar before and after modification for pefloxacin was studied by static adsorption experiments. Finally, the adsorption behavior of pefloxacin on GO-SBC was investigated through adsorption models, and the potential adsorption mechanisms were further analyzed by the FTIR and XPS techniques. The results showed that: (1) GO-SBC surface has become rougher, and there are more oxygen-containing functional groups compared with SBC.; (2) Kinetics adsorption studies showed that the removal rate of pefloxacin by GO-SBC increased by 40.32% compared with SBC, and its maximum adsorption capacity was 137.51 mg/g; the adsorption process was in accordance with the pseudo-second-order kinetic model, which indicated that the adsorption process was mainly dominated by chemical adsorption; (3) The adsorption of pefloxacin by GO-SBC conforms to the Freundlich model, indicating that the adsorption process was a multi-layer adsorption; (4) The thermodynamic analysis showed that the adsorption process is a spontaneous endothermic reaction; (5) There are two main adsorption mechanisms of GO-SBC for pefloxacin; one is the π-π interaction ,and the other is the interaction between N—H of GO-SBC and C—H on pefloxacin. Therefore, GO-SBC could be a highly effective adsorbent for removing pefloxacin, which provides the ideas for the resource utilization of urban residual sludge, and also provides a method for antibiotic wastewater treatment.
Key words:  graphene oxide  biochar  pefloxacin  adsorption mechanism