Huang Danlian, Wang Xi, Zhang Chen, Zeng Guangming, Peng Zhiwei, Zhou Jin, Cheng Min, Wang Rongzhong, Hu Zhengxun, Qin Xiang
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environment Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environment Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China.
Chemosphere. 2017 Nov;186:414-421. doi: 10.1016/j.chemosphere.2017.07.154. Epub 2017 Jul 31.
Significant concerns have been raised over antibiotics pollution in aquatic environments in recent years. In this study, sorption of sulfamethazine (SMT) by novel graphene oxide-coated biochar nanocomposites (GO-BC) based on graphene oxide (GO) with bamboo sawdust biochar (BC) was investigated. In comparison with the original BC, the sorption capacity of GO-BC for SMT increased by 1.14 times. Sorption of SMT onto GO-BC was proved to be dominantly by chemisorption, and Freundlich isotherm described the sorption adequately. It was found that variation of pH and ionic strength obviously affected the sorption of SMT, and GO-BC had a good sorption effect on SMT at pH 3.0-6.0 and lower ionic strength. Obvious enhancement (by 30%) in sorption of SMT on GO-BC was observed, which might be attributed to the increase of functional groups on the surface of GO-BC. Moreover, the main sorption mechanism for SMT was π-π electron-donor-acceptor interaction, while auxiliary sorption mechanisms were inferred as pore-filling, cation exchange, hydrogen bonding interaction and electrostatic interaction. The results indicated that GO-BC sorption was an efficient way for the removal of SMT.
近年来，人们对水环境中的抗生素污染问题高度关注。在本研究中，考察了基于氧化石墨烯（GO）和竹屑生物炭（BC）制备的新型氧化石墨烯包覆生物炭纳米复合材料（GO-BC）对磺胺二甲嘧啶（SMT）的吸附性能。与原始生物炭相比，GO-BC对SMT的吸附容量提高了1.14倍。结果表明，SMT在GO-BC上的吸附以化学吸附为主，Freundlich等温线能较好地描述该吸附过程。研究发现，pH值和离子强度的变化对SMT的吸附有显著影响，GO-BC在pH值为3.0-6.0且离子强度较低时对SMT具有良好的吸附效果。观察到SMT在GO-BC上的吸附明显增强（提高了30%），这可能归因于GO-BC表面官能团的增加。此外，SMT的主要吸附机制为π-π电子供体-受体相互作用，推测辅助吸附机制为孔隙填充、阳离子交换、氢键相互作用和静电相互作用。结果表明，GO-BC吸附是去除SMT的一种有效方法。
