Adsorption of Hg(II) in water by thiol-functionalized MCM-41

被引：0
|
作者：
Qin, Qingdong [1 ]
Chen, Zhizhen [2 ]
Fu, Dafang [1 ]
Ma, Jun [3 ]
机构：
[1] School of Civil Engineering, Southeast University
[2] Central and Southern China Municipal Engineering Design and Research Institute Co., Ltd
[3] School of Municipal and Environmental Engineering, Harbin Institute of Technology
来源：
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2013年 / 43卷 / 05期
关键词：
Adsorption; Hg(II); Isotherm; Thiol-functionalized MCM-41;
D O I：
10.3969/j.issn.1001-0505.2013.05.019
中图分类号：
学科分类号：
摘要：
MCM-41 was modified by 3-mercaptopropyltrimethoxysilane to remove Hg(II) from aqueous solution. The thiol-functionalized MCM-41 obtained was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). In addition, the influences of the initial solution concentration, contact time, temperature, pH and concentration of chloride ion on the adsorption ability of thiol-functionalized MCM-41 for Hg(II) in water were investigated. The results show that the adsorption of Hg(II) by thiol-functionalized MCM-41 accords with the pseudo-second-order kinetic model and the adsorption isotherm can be fitted well by the Langmuir model. The increase of temperature benefits the adsorption of Hg(II) by thiol-functionalized MCM-41, indicating that the adsorption is endothermic. The maximum adsorption capacities are 219 and 258 mg/g at the temperatures of 298 and 308 K respectively. The solution pH (2.0 to 7.6) has no significant effect on the adsorption of Hg(II) by thiol-functionalized MCM-41. However, the adsorption capacity decreases with the increase in the chloride ion concentration. Finally, the results of desorption experiments show that the thiol-functionalized MCM-41 has a relatively high affinity to Hg(II).
引用
收藏
页码：1011 / 1016
页数：5
相关论文
共 13 条
  • [1] Chiarle S., Ratto M., Rovatti M., Mercury removal from water by ion exchange resins adsorption, Water Research, 34, 11, pp. 2971-2978, (2000)
  • [2] Benhammou A., Yaacoubi A., Nibou L., Et al., Study of the removal of mercury (II) chromium(VI) from aqueous solutions by Moroccan stevensite, Journal of Hazardous Materials, B117, 213, pp. 243-249, (2005)
  • [3] Babi B.M., Milonji S.K., Polovina M.J., Et al., Adsorption of zinc, cadmium and mercury ions from aqueous solutions on an activated carbon cloth, Carbon, 40, 7, pp. 1109-1115, (2002)
  • [4] Zhang C., Zhou W., Lu P., Et al., Adsorption of Pb(II) by mercapto-modified MCM-41, Chemistry, 69, 7, pp. 529-531, (2006)
  • [5] Puanngam M., Unob F., Preparation and use of chemically modified MCM-41 and silica gel as selective adsorbents for Hg (II) ions, Journal of Hazardous Materials, 154, 1-3, pp. 578-587, (2008)
  • [6] Teng M., Wang H., Li F., Et al., Thioether-functionalized mesoporous fiber membranes: sol-gel combined electrospun fabrication and their applications for Hg<sup>2+</sup> removal, Journal of Colloid and Interface Science, 355, 1, pp. 23-28, (2011)
  • [7] Jeong E.Y., Ansari M.B., Mo Y.H., Et al., Removal of Cu(II) from water by tetrakis(4-carboxyphenyl) porphyrin-functionalized mesoporous silica, Journal of Hazardous Materials, 185, 2-3, pp. 1311-1317, (2011)
  • [8] Broyer M., Valange S., Bellat J.P., Et al., Influence of aging, thermal, hydrothermal, and mechanical treatments on the porosity of MCM-41 mesoporous silica, Langmuir, 18, 13, pp. 5083-5091, (2002)
  • [9] Mercier L., Pinnavaia T.J., Heavy metal ion adsorbents formed by the grafting of a thiol functionality to mesoporous silica molecular sieves: factors affecting Hg(II) uptake, Environmetal Science and Technology, 32, 18, pp. 2749-2754, (1998)
  • [10] Ramakrishna T.V., Aravamudan G., Vijayakumar M., Spectrophotometric determination of mercury(II) as the ternary complex with rhodamine 6G and iodide, Analytica Chimica Acta, 84, 2, pp. 369-375, (1976)
12