碱改性凹凸棒吸附水体重金属铅实验研究
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摘要
将凹凸棒进行改性,获得高效重金属吸附剂材料-碱改性凹凸棒(PLA-M),主要通过表征分析、单因素试验、吸附动力学试验、吸附等温试验,获得了最佳反应条件,并利用动力学方程和等温方程拟合,对吸附机理简单分析。试验结果表明:PLA-M材料有很大的比表面积,而且孔径比较大,在投加量0.2g、Pb~(2+)的初始浓度500mg/L、pH为4、温度30℃时吸附效果最好,反应平衡时,Pb~(2+)吸附速率达到97%以上,饱和吸附量接近0.5g/g,动力学试验表明,二级动力学方程对吸附过程的拟合结果最佳,R~2可以达到0.99,说明PLA-M对Pb~(2+)的吸附以化学吸附为主;等温试验表明,Langmuir方程对吸附过程的拟合结果较好,R~2接近0.7,说明PLA-M对Pb~(2+)的吸附以单层吸附为主。
引文
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[2]Liu p,Wang T M.Adsorption properties of hyperbaranched aliphatic polyester grafted ATP towards heavy metal ions[J].Journal of Hazardous Materials,2007,149(1):75
[3]Liu p,Wang T M,Su Z X.Self-assembly of well-defined polyacrylamide-polystyrene copolymer on fibrillar clays via ultrasonic-assisted surface-initiated atom transfer radical polymer-ization[J].Journal of Nanoscience and Nanotechnology,2006,6(6):1684
[4]Murray H H.Traditional and new applications for kaolin,smectite,and palygorskite:a general overview[J].Applied Clay Science,2000,17(5/6):207
[5]NeamanA,Singe A.Possible use of the Sacalum(Yucatan)palygorskite as drilling muds[J].Applied Clay Science,2004,25(1/2):121
[6]Potgieter J H,Potgieter-Vermaak S S,Kalibantonga P D.Heavy mentals removal from solution by palygorskite clay[J].Minerals Engineering.2006,19(5):463
[7]胡振琪,杨秀红,高爱林.粘土矿物对重金属镉的吸附研究[J].金属矿山,2004,(6):53-55
[8]Fan Q H,Li Z,Zhao H G,et al.Adsorption of Pb(Ⅱ)on palygorskite from aqueous solution:Effects of PH,ionic strength and temperature[J].Apply Clay Science,2009,45:111-116
[9]邓月华.改性凹凸棒吸附去除水中铅离子心得安及溶解性有机物[D].南京大学,2012.
[10]Cao E H,Robert B,David J A.Electrochemical properties of Na-attapulgite[J].Journal of Colloid and Interface Science,1996,179(1):143
[11]谭光群,袁红雁,刘勇,等.小麦秸杆对水中Pb(2+)和Cd(2+)的吸附特性[J].环境科学,2011,32(8):2298-2304
[12]孔泳,王志良,孙涛,等.凹凸棒应用于重金属离子吸附剂的研究[J].分析测试学报,2010,29(12):1224-1227
[13]殷竟洲,杨文澜,夏士鹏.壳聚糖改性凹凸棒对重金属离子的吸附[J].化工环保,2007,27(3):276-279