Beijing Key Laboratory for Solid Waste Utilization and Management, Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, China.
J Hazard Mater. 2013 Jan 15;244-245:94-101. doi: 10.1016/j.jhazmat.2012.11.043. Epub 2012 Nov 26.
Silica-based adsorbent was prepared by γ-radiation induced grafting of vinyl imidazole (VIM) onto the silanized silica, which was silanized by chlorotrimethylsilane (TMCS). The effects of monomer concentration and absorbed dose on the grafting yield were investigated to optimize the reaction conditions. Thermodynamic analysis, FTIR analysis and XPS spectra manifested that VIM was successfully grafted onto the silica surface. The SS-g-VIM adsorbent had excellent selectivity for Hg(II) adsorption in mixture divalent cationic metal solution and a high adsorption capacity of Hg(II). The theoretical maximum adsorption capacity was calculated to be 355.9 mg g(-1) (1.774 mmol g(-1)) in HgCl(2)/HNO(3) solution at pH 5 at room temperature. The adsorption kinetics and adsorption isotherm were investigated. It was found that the Langmuir isotherm model fitted well with the adsorption process and the adsorption of Hg(II) onto SS-g-VIM adsorbent could be considered as a spontaneous, endothermic and chemical sorption process. The comprehensive results suggested that SS-g-VIM adsorbent has potential application for the removal of Hg(II) from wastewater.
采用γ射线引发的硅烷化硅胶上接枝乙烯基咪唑（VIM）的方法制备了基于硅的吸附剂，硅胶是用三甲基氯硅烷（TMCS）硅烷化的。考察了单体浓度和吸收剂量对接枝率的影响，以优化反应条件。热力学分析、FTIR 分析和 XPS 谱表明，VIM 成功接枝到硅胶表面。SS-g-VIM 吸附剂对混合二价阳离子金属溶液中的 Hg(II)吸附具有优异的选择性和高吸附容量。在室温下 pH 值为 5 的 HgCl(2)/HNO(3)溶液中，理论最大吸附容量计算为 355.9mg g(-1)（1.774mmol g(-1)）。研究了吸附动力学和吸附等温线。结果表明，Langmuir 等温线模型很好地拟合了吸附过程，Hg(II)在 SS-g-VIM 吸附剂上的吸附可以被认为是自发的、吸热的和化学吸附过程。综合结果表明，SS-g-VIM 吸附剂具有从废水中去除 Hg(II)的潜在应用。
