Sorption of trace heavy metals by thiol containing chelating resins
Sorption of trace heavy metals by thiol containing chelating resins
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DOI：
10.1080/07366290008934676
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发表时间：
2000-01-01
影响因子：
2
通讯作者：
Streat, M
中科院分区：
文献类型：
--
作者：
Saha, B;Iglesias, M;Streat, M
研究了巯基螯合树脂（硫甲基树脂和Duolite GT-73）对铜、镉、镍和锌离子的吸附性能。这些聚合物的物理和化学表征的形式，扫描电子显微镜（SEM），BET和朗缪尔表面积测量，傅里叶变换红外光谱（FTIR）分析，X射线光电子能谱（XPS）分析，原子组成测量，钠容量测定和zeta电位测量已进行评估其作为吸附剂的痕量有毒金属去除的性能。采用密度泛函理论（DFT）对孔径分布数据进行了分析。在间歇平衡实验中研究了这些吸附剂对水溶液中金属离子的吸附。还研究了pH值对金属吸附容量的影响。这些聚合物的动力学性能进行了评估，并通过孔扩散模型分析了结果。该树脂已被用于微型柱，以研究对所需的金属离子的选择性。使用盐酸（1 M和4 M）、硫酸（1 M和4 M）和酸化硫脲研究了金属离子的解吸。本研究证实，这些硫醇基螯合树脂是非常有效的选择性去除水中痕量重金属。
The sorption of copper, cadmium, nickel and zinc ions on thiol (-SH) based chelating polymeric resins (thiomethyl resin and Duolite GT-73) has been investigated. The physical and chemical characterisation of these polymers in the form of scanning electron micrographs (SEM), BET and Langmuir surface area measurements, Fourier transform infra red spectroscopy (FTIR) analysis, X-ray photoelectron spectroscopy (XPS) analysis, atomic composition measurement, sodium capacity determination and zeta potential measurements have been conducted to assess their performance as sorbents for trace toxic metal removal. Density functional theory (DFT) has been used to analyse the pore size distribution data. The adsorption of metal ions from aqueous solution on these sorbents has been studied in batch equilibrium experiments. The influence of pH on metal adsorption capacity has also been examined. The kinetic performance of these polymers has been assessed and the results have been analysed by a pore diffusion model. The resins have been used in mini-columns to study the selectivity towards the desired metal ion. The desorption of metal ions has been studied using hydrochloric acid (1 M and 4 M), sulphuric acid (1 M and 4 M) and acidified thiourea. The present study confirms that these thiol based chelating resins are very effective for selective removal of trace heavy metals from Water.