Removal of heavy metal ions using a novel cross-linked polyzwitterionic phosphonate
Removal of heavy metal ions using a novel cross-linked polyzwitterionic phosphonate
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DOI：
10.1016/j.seppur.2012.07.019
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发表时间：
2012-09-19
影响因子：
8.6
通讯作者：
Ali, Shaikh A.
中科院分区：
文献类型：
--
作者：
Al Hamouz, Othman Charles S.;Ali, Shaikh A.
在叔丁基过氧化氢存在下，二烯丙基氨基甲基膦酸与1，1，4，4-四烯丙基哌嗪二氯化物（10mol%）在85 ℃水溶液中进行环聚合，合成了一种新型的交联聚两性离子酸（CPZA）。用NaOH处理后，CPZA转化为交联的阴离子交联剂（CAPE）。CAPE对Pb 2+和Cu 2+的吸附符合Lagergren二级动力学模型，吸附等温线符合Langmuir和Freundlich模型。结果表明，该复合材料对Pb ~（2+）的吸附量大于对Cu ~（2+）的吸附量，而对Cu ~（2+）的吸附速率大于对Pb ~（2+）的吸附速率。吸附过程是自发的，吸热的性质与负和正值的Δ G和Δ H，分别。Cu ~（2+）和Pb ~（2+）的吸附活化能分别为12.8和17.9 kJ/mol，表明吸附过程是一个有利的过程。该树脂对重金属离子具有良好的吸附性能和解吸性能，表明该树脂对重金属离子具有良好的吸附和解吸性能。一种有效的合成树脂将使其能够用于处理受污染的废水。(c)2012爱思唯尔有限公司版权所有。
A novel cross-linked polyzwitterionic acid (CPZA) was synthesized via cyclocopolymerization of diallylaminomethylphosphonic acid and 1,1,4,4-tetraallylpiperazinium dichloride (10 mol%), a cross-linker, in the presence of tert-butylhydroperoxide in aqueous solution at 85 degrees C. CPZA, upon treatment with NaOH, was converted into a cross-linked anionic polyelectrolyte (CAPE). The experimental data for the adsorption of Pb2+ and Cu2+ on CAPE fitted Lagergren second-order kinetic model and Langmuir as well as Freundlich isotherm models. The adsorption capacity of Pb2+ was higher than that of Cu2+ while the rate of adsorption was found to be higher for Cu2+. The adsorption process was spontaneous and endothermic in nature with negative and positive values for Delta G and Delta H, respectively. The low activation energies of 12.8 and 17.9 kJ/mol for Cu2+ and Pb2+, respectively, indicated the adsorption as a favorable process. The excellent adsorption and very good desorption efficiencies implied the efficacy of the resin in removing as well as recovering the metal ions from aqueous solution. An efficient synthetic access to the resin would enable its use in the treatment of contaminated waste water. (c) 2012 Elsevier B.V. All rights reserved.