镍改性硅藻土对废水中Pb(Ⅱ)吸附性能的研究  

The Ni modification of diatomite and its influence on the Pb(Ⅱ) adsorption performance in waste water

作　　者：周慧杰 杨慧敏 王硕 王丽[1] 郭小惠[1] 刘金彦[1] ZHOU Huijie;YANG Huimin;WANG Shuo;WANG Li;GUO Xiaohui;LIU Jinyan(Chemistry and Chemical Engineering School,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学化学与化工学院

出　　处：《内蒙古科技大学学报》2019年第2期109-112,165,共5页Journal of Inner Mongolia University of Science and Technology

基　　金：内蒙古自治区自然科学基金资助项目(2017BS0204);内蒙古科技大学博士启动基金资助项目(2016QDL-B06);内蒙古科技大学大学生科技创新基金资助项目(2017046)

摘　　要：采用SEM,XRD对改性硅藻土进行表征,考察了改性剂加入量、吸附剂的投入量、溶液初始浓度、溶液初始pH值和吸附时间等因素对铅离子在改性硅藻土上吸附的影响,并进行了吸附动力学研究.结果表明:改性后孔径明显比原生硅藻土大,同时,SiO 2的结晶度明显增强,这说明经高温煅烧去除了一部分有机杂质;改性硅藻土对铅离子吸附量可达到62.67 mg/g;改性硅藻土对铅离子的吸附行为符合准二级动力学模型.Modified diatomite adsorbent used for the removal of Pb(Ⅱ)from waste water was prepared by fully mixing diatomite samples with Ni^2+solution and CTAB.The adsorbent was characterized by Scanning Electron Microscope(SEM)and X-Ray diffractome(XRD).Batch adsorption experiments were conducted to study the influence of various factors,such as the amount of Ni^2+,adsorbent dose,initial concentration of Pb(Ⅱ)solution,initial pH,and contact time on the adsorption of Pb(Ⅱ)solution.At the same time,the adsorption kinetics was investigated.The results indicate that the morphology of diatomite changed greatly after the modification,and the pore size of the modified diatomite was obviously larger than the original native diatomite.After the modification,the crystallinity of SiO2 was obviously enhanced,indicating that some organic impurities were removed by high temperature calcination.The adsorption amount of Pb(Ⅱ)on the modified diatomite could reach 62.67 mg/g.The adsorption behavior of the modified diatomite in Pb(Ⅱ)solution is well fitted to the pseudo-second-order kinetic model.

关 键 词：硅藻土 改性 重金属离子 吸附理论 

分 类 号：O069[理学]