Fe_3O_4/石墨烯活化过硫酸盐降解罗丹明B废水的研究  

Degradation of Rhodamine B Wastewater by Persulfate Activated with Fe_3O_4/graphene

作　　者：杨焱明 冷艳秋[2] 林欣[2] 岳馨馨 郝菲菲[2] 国伟林[2] 

机构地区：[1]山东省科技干部学校,山东济南250101 [2]济南大学资源与环境学院,山东济南250022

出　　处：《环境科学与管理》2014年第4期80-84,共5页Environmental Science and Management

基　　金：山东省自然科学基金项目资助(ZR2013EEM004)

摘　　要：利用水热法合成石墨烯负载Fe3O4催化剂,利用X-射线衍射、红外光谱、比表面积等对其进行表征。以Fe3O4/石墨烯为催化剂,活化过硫酸钾降解罗丹明B,考察了石墨烯与Fe3O4配比、催化剂用量、氧化剂浓度、pH值和温度等因素对其降解性能的影响。石墨烯的加入可以显著提高罗丹明B的降解率,氧化剂用量的增加有利于降解反应,弱酸性条件有利于降解;温度升高对罗丹明B降解有利。在该反应体系中存在的自由基以SO-4为主,·OH和O-2为辅。In this study, the graphene coated Fe3O4 （Fe3O4/graphene） was synthesized by hydrothermal method. The syn- thetic nanoparticles were characterized using X -ray diffraction（ XRD）, Fourier -transform infrared（FFIR） spectra and Brunauer -Emmett- Teller（BET） nitrogen adsorption. Effects of Fe3 O4/graphene addition, persulfate concentration, pH, and tempera- ture on the degradation rate of Rhodamine B by persulfate are examined in batch experiments. Results indicated that the presence of graphene successfully accelerates the degradation rate of RhB. The graphene and Fe3O4 ratio 1：5 favored the Rhodamine B de- composition; the degradation rate increased as the initial persulfate concentration increased; the degradation rate was low at neu- tral and alkaline conditions while acidic conditions was higher; increasing the temperature may significantly accelerate the Rhoda- mine B degradation, and the degradation is found to follow the pseudo - first - order kinetic model. The effect of radical scaven- gers on the degradation of Rhodamine B was also studied, proving that SO4- is the major radical and ·OH andO2- are the assis- tant radicals in this study.

关 键 词：石墨烯 四氧化三铁 硫酸根自由基 过硫酸钾 罗丹明B 

分 类 号：X703.1[环境科学与工程—环境工程]