Removal of Hg(II) from aqueous solutions using a novel impregnated resin containing 1-(2-thiazolylazo)-2-naphthol (TAN)
Removal of Hg(II) from aqueous solutions using a novel impregnated resin containing 1-(2-thiazolylazo)-2-naphthol (TAN)
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DOI：
10.1016/j.cej.2011.02.004
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发表时间：
2011-04
影响因子：
15.1
通讯作者：
A. Hosseini-Bandegharaei;M. Hosseini;Yousef Jalalabadi;Masoud Sarwghadi;M. Nedaie;A. Taherian;A. Ghaznavi;A. Eftekhari
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文献类型：
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作者：
A. Hosseini-Bandegharaei;M. Hosseini;Yousef Jalalabadi;Masoud Sarwghadi;M. Nedaie;A. Taherian;A. Ghaznavi;A. Eftekhari
将1-（2-噻唑偶氮）-2-萘酚（TAN）浸渍到Amberlite XAD-4树脂珠上，制备了一种新型高效Hg（II）吸附剂。批量吸附实验进行了使用新的萃取剂浸渍树脂，EIR从水溶液中去除汞（II）。考察了pH值、初始浓度、EIR用量、接触时间和温度等因素对反应的影响。实验结果表明，除汞的最佳条件为pH值5-6，EIR投加量0.5gL− 1，平衡时间55 min。平衡吸附等温线符合Langmuir吸附等温线模型。EIR对Hg（II）离子的最大吸附容量（qmax）为450.45mgg−1。温度的升高增加了吸附。吉布斯自由能（ΔG°）为负值，表明吸附过程在不同温度下都是自发进行的。计算了反应的熵变（ΔS°）和焓变（ΔH°）。动力学研究结果表明，吸附过程符合Bangham动力学模型，孔隙扩散是速率控制步骤。孔隙扩散系数Dp值约为10− 12 m2 s −1。新的EIR可以成功地回收几个连续的周期，而不会显着损失其吸附能力。
A novel efficient Hg(II) adsorbent was prepared by impregnating 1-(2-thiazolylazo)-2-naphtol (TAN) onto Amberlite XAD-4 resin beads. Batch sorption experiments were carried out for the removal of Hg(II) from aqueous solutions using the new extractant-impregnated resin, EIR. The influences of various experimental parameters like pH, initial concentration, EIR dosage, contact time and the effect of temperature were evaluated. Optimum conditions for Hg(II) removal were found to be pH range of 5–6, EIR dosage 0.5gL−1and equilibrium time 55min. The equilibrium sorption isotherm was better described by Langmuir sorption isotherm model. The maximum sorption capacity (qmax) of EIR for Hg(II) ions in terms of monolayer sorption was 450.45mgg−1. Increase of temperature increased the sorption. The obtained negative values of Gibbs free energy (ΔG°) indicated feasible and spontaneous nature of the sorption process at different temperatures. The change of entropy (ΔS°) and enthalpy (ΔH°) were estimated. Results of the kinetic studies showed that the sorption process follows Bangham's kinetic model, and the pore diffusion is the rate-controlling step. The pore diffusion coefficients, Dpvalues, were of the order of 10−12m2s−1. The new EIR could be successfully recycled for several consecutive cycles without significant loss in its sorption capacity.