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一步溶胶-凝胶法制备的硫醇功能化无孔二氧化硅微球对汞（II）水溶液的去除

Removal of aqueous Hg(ii) by thiol-functionalized nonporous silica microspheres prepared by one-step sol-gel method.

作者信息

Liang Ruixue, Zou Hua

机构信息

School of Materials Science and Engineering, University of Shanghai for Science and Technology 516 Jungong Road Shanghai 200093 China

出版信息

RSC Adv. 2020 May 15;10(31):18534-18542. doi: 10.1039/d0ra02759f. eCollection 2020 May 10.

DOI:10.1039/d0ra02759f
PMID:35517226
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9053728/
Abstract

It is well known that thiol-functionalized silica (SiO-SH) can be used as an effective adsorbent for the removal of Hg(ii) from water. Studies in this field have focused on porous silica gels and mesoporous silicas that have large surface area and pore volume, while nonporous silica particles are seldom reported. This work aims to investigate the Hg(ii) adsorption properties of nonporous SiO-SH microspheres prepared by a simple one-step sol-gel method. The effects of pH, initial concentration of Hg(ii) and temperature on the adsorption properties of the SiO-SH microspheres were studied batch adsorption experiments. The maximum adsorption capacity for Hg(ii) at 293 K calculated from the Langmuir equation was 377.36 mg g. The adsorption kinetics and equilibrium data were well-fitted to the pseudo-second-order model and the Langmuir isotherm model, respectively.

摘要

众所周知，硫醇官能化二氧化硅（SiO-SH）可作为一种有效的吸附剂用于去除水中的汞（II）。该领域的研究主要集中在具有大表面积和孔体积的多孔硅胶和介孔二氧化硅上，而关于无孔二氧化硅颗粒的报道较少。本工作旨在研究通过简单的一步溶胶-凝胶法制备的无孔SiO-SH微球对汞（II）的吸附性能。通过批量吸附实验研究了pH值、汞（II）初始浓度和温度对SiO-SH微球吸附性能的影响。根据朗缪尔方程计算得出，在293K时汞（II）的最大吸附容量为377.36mg/g。吸附动力学和平衡数据分别很好地拟合了准二级模型和朗缪尔等温线模型。

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