MIL-101(Fe)对草甘膦的吸附行为研究  

Adsorption of glyphosate by MIL-101(Fe)

作　　者：蒋实 黄芳[2] 林晓宇 吴桂萍 崔龙哲 Jiang Shi;Huang Fang;Lin Xiaoyu;Wu Guiping;Cui Longzhe(College of Resources and Environmental Science,South-Central University for Nationalities,Wuhan 430074,China;Huangshi Institute of Environmental Sciences,Huangshi 435003,China)

机构地区：[1]中南民族大学资源与环境学院,湖北武汉430074 [2]黄石市环境保护研究所,湖北黄石435003

出　　处：《武汉科技大学学报》2019年第2期121-128,共8页Journal of Wuhan University of Science and Technology

基　　金：湖北省自然科学基金资助项目(2015CFB550)

摘　　要：采用溶剂热法制备MIL-101(Fe)用作吸附材料,借助XRD、SEM、XPS及氮气吸脱附测试对所制材料的形貌及结构进行表征,研究了溶液pH值、反应时间、溶液浓度以及温度对其吸附草甘膦行为的影响。结果表明,当pH为3时,MIL-101(Fe)对草甘膦的吸附效果最佳,且随着温度的升高,MIL-101(Fe)对草甘膦的吸附速率明显增加,吸附过程符合拟二级动力学,等温吸附实验数据符合Langmuir和Temkin模型。MIL-101(Fe)吸附草甘膦属自发吸热的化学吸附反应,MIL-101(Fe)的中心金属Fe与草甘膦中O的配位在吸附过程中起主要作用。MIL-101(Fe) were prepared by solvothermal method and used as adsorption materials. The structure and morphology of the samples were characterized by XRD,SEM,XPS and N 2 adsorption-desorption isotherms,and the effects of pH,reaction time,concentration and temperature on the adsorption of GP by MIL-101(Fe) were investigated. The results show that MIL-101(Fe)materials manifest the best adsorption properties under pH value of 3,and the adsorption rate of GP by MIL-101(Fe) increases significantly with the increase of temperature. The adsorption process conforms with the pseudo-second-order kinetics,and isothermal adsorption test data are compliant with the Langmuir and Temkin isotherm models. The adsorption of GP on MIL-101(Fe) is spontaneous and endothermic,and the coordination between the Fe(Ⅲ) of MIL-101 (Fe) and the oxygen from GP dominates the adsorption process.

关 键 词：MIL-101(Fe) 草甘膦 吸附行为 等温吸附 吸附动力学 吸附热力学 

分 类 号：O647.32[理学—物理化学]