聚乙烯醇(PVA)改性膨胀石墨对亚甲基蓝废水的吸附  

Adsorption of methylene blue dye from wastewater by expanded graphite modified using PVA

作　　者：赵越[1] 马乐宽[1] 赵康平[1] 吴波[1] 杨文杰[1] 

机构地区：[1]环境保护部环境规划院,北京100012

出　　处：《环境工程学报》2015年第12期5709-5713,共5页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(40901149)

摘　　要：以天然鳞片石墨为原料,聚乙烯醇(PVA)为改性剂,采用浸渍法制备改性膨胀石墨(M-EG),对改性膨胀石墨(M-EG)的官能团结构组成、比表面积、孔径分布及孔隙度等进行了表征,研究了其对亚甲基蓝染料废水的吸附性能,并对其吸附动力学、等温吸附类型和吸附热力学进行了研究。结果表明,经PVA改性后,M-EG的比表面积、孔隙度均增大,表面极性降低;M-EG对亚甲基蓝染料的吸附符合二级动力学吸附模型,并符合Langmiur等温吸附模型和Freundlich等温吸附模型;该反应为吸热的自发反应。Modified expanded graphite（ M-EG） was prepared by polyvinyl alcohol（ PVA）. The surface functional group,specific surface area,pore size distribution of the adsorbents were characterized. Especially,the adsorption kinetics,isothermal adsorption and adsorption thermodynamics of methylene blue dye wastewater by M-EG were experimental studied. It was showed that PVA treatment increased the pores structure and surface functional groups of EG and reduced surface polarity. The adsorption reaction onto M-EG conformed second adsorption kinetics model,and accorded with the Langmiur isothermal equation and Freundlich isotherm equation.The adsorption reaction was endothermic spontaneous.

关 键 词：膨胀石墨 废水 吸附 

分 类 号：X703[环境科学与工程—环境工程]