Malik Lateef Ahmad, Bashir Arshid, Manzoor Taniya, Pandith Altaf Hussain
Department of Chemistry, University of Kashmir Hazratbal Srinagar-190006 Kashmir India
RSC Adv. 2019 May 21;9(28):15976-15985. doi: 10.1039/c9ra00243j. eCollection 2019 May 20.
Glutathione has tremendous binding potential with metal ions present in water. However, the solubility of glutathione in water limits its productivity in the removal of these toxic ions from aqueous systems. The removability of heavy ions with glutathione and the associated adsorption capability are enhanced; for this purpose, glutathione is coated over hollow zinc oxide particles. Glutathione-coated hollow zinc oxide (Glu@h-ZnO) was successfully synthesized under microwave (MW) conditions using polystyrene (PS) as the template. The as-synthesized material was characterized by Fourier transform infrared (FTIR) spectroscopy, and the results were supported by X-ray diffraction crystallography (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermal gravimetric analysis (TGA), differential thermal analysis (DTA), dynamic light scattering (DLS), Brunauer-Emmett-Teller (BET) studies and zeta potential () analysis. The sorption performance of Glu@h-ZnO towards the uptake of Hg, Cd and Pb ions from an aqueous medium under non-competitive batch conditions was investigated and the material was found to have the maximum affinity for Hg ions with a maximum adsorption ( ) capacity of 233 mg g. The adsorption kinetics for Hg ions and the effects of pH and on the adsorption properties were also studied in detail. Finally, the experimental data were correlated with theoretical data obtained from density functional theory (DFT) studies and good agreement between the two was obtained.
谷胱甘肽与水中存在的金属离子具有巨大的结合潜力。然而，谷胱甘肽在水中的溶解度限制了其从水体系中去除这些有毒离子的效率。谷胱甘肽对重金属离子的去除能力及其相关吸附能力得到了增强；为此，将谷胱甘肽包覆在空心氧化锌颗粒上。以聚苯乙烯（PS）为模板，在微波（MW）条件下成功合成了谷胱甘肽包覆的空心氧化锌（Glu@h-ZnO）。通过傅里叶变换红外（FTIR）光谱对合成的材料进行了表征，结果得到了X射线衍射晶体学（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、热重分析（TGA）、差热分析（DTA）、动态光散射（DLS）、布鲁诺尔-埃米特-泰勒（BET）研究和zeta电位（）分析的支持。研究了Glu@h-ZnO在非竞争性分批条件下从水介质中吸附Hg、Cd和Pb离子的性能，发现该材料对Hg离子具有最大亲和力，最大吸附（）容量为233 mg g。还详细研究了Hg离子的吸附动力学以及pH和对吸附性能的影响。最后，将实验数据与密度泛函理论（DFT）研究获得的理论数据进行了关联，两者之间取得了良好的一致性。
