| H3PO4改性PS-EDTA树脂对水相中Cu2+、Zn2+和Cd2+的吸附性能研究 |
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| 引用本文： | 李晓丽,王雪艳,李彦锋. H3PO4改性PS-EDTA树脂对水相中Cu2+、Zn2+和Cd2+的吸附性能研究[J]. 离子交换与吸附, 2012, 28(3): 193-203 |
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| 作者姓名： | 李晓丽 王雪艳 李彦锋 |
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| 作者单位： | 1. 兰州大学资源环境学院,兰州大学化学化工学院兰州大学生物化工及环境技术研究所,兰州730000
2. 烟台汽车工程职业学院,烟台,265500 |
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| 基金项目： | 国家水体污染控制与治理科技重大专项 |
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| 摘 要： | 大孔氯甲基化聚苯乙烯小球先后与乙二胺、2-氯乙酸反应得EDTA型螯合树脂(PS-EDTA),再用磷酸在室温处理得PS-EDTA/P树脂。PS-EDTA/P树脂被用于水相中Cu2+、Zn2+和Cd2+的吸附净化处理,探讨了溶液的pH值、初始金属离子浓度、时间、温度等因素对吸附性能的影响,并研究了其对重金属离子的吸附动力学和热力学。结果表明,PS-EDTA/P树脂对Cu2+和Zn2+的吸附符合Langmuir等温式、对Cd2+的吸附符合Freundlich等温式,准二级吸附动力学方程能够很好地描述3种金属离子在树脂上的吸附动力学行为。同时,PS-EDTA/P树脂对重金属吸附的热力学参数表明,PS-EDTA/P树脂对Cu2+、Zn2+和Cd2+的吸附是一个自发的、吸热的过程。已吸附Cu2+、Zn2+和Cd2+的树脂可以用0.1mol/L HCl解吸,解吸后的树脂对Cu2+、Zn2+和Cd2+仍具有较高的吸附量。
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| 关 键 词： | 重金属去除 Cu2+、Zn2+和Cd2+ PS-EDTA/P树脂 吸附 |
ADSORPTION OF Cu2+, Zn2+ AND Cd2+ FROM AQUEOUS SOLUTION ONTO PHOSPHATE-MODIFIED PS-EDTA RESIN |
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| LI Xiaoli , WANG Xueyan , LI Yanfeng. ADSORPTION OF Cu2+, Zn2+ AND Cd2+ FROM AQUEOUS SOLUTION ONTO PHOSPHATE-MODIFIED PS-EDTA RESIN[J]. Ion Exchange and Adsorption, 2012, 28(3): 193-203 |
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| Authors: | LI Xiaoli WANG Xueyan LI Yanfeng |
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| Affiliation: | 1 School of Resource and Environment Science,College of Chemistry and Chemical Engineering,Institute of Biochemical Engineering and Environmental Technology Lanzhou University,Lanzhou 730000,China 2 Yantai Professional School of Automobile Engineering,Yantai 265500 |
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| Abstract: | The adsorption characteristics of Cu2+,Zn2+ and Cd2+ from aqueous solutions on PS-EDTA/P resin were studied.The effects of solution pH,initial metal concentration,contact time and temperature on adsorption were investigated.The adsorption equilibrium data of Cu2+ and Zn2+ were best represented by the Freundlich isotherm model,while those of Cd2+ were well described by the Langmuir isotherm model.The adsorption kinetics of Cu2+,Zn2+ and Cd2+ were found to follow the pseudo-second-order kinetic model.Thermodynamic parameters such as standard enthalpy(ΔH),standard entropy(ΔS) and standard free energy(ΔG) were determined and the results showed that the adsorption process of Cu2+,Zn2+ and Cd2+ was endothermic and spontaneous in nature.Finally,the desorption studies were carried out using 0.1mol/L HCl solution. |
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| Keywords: | Heavy metal removal Cu2+,Zn2+ and Cd2+ PS-EDTA/P resin Adsorption. |
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