Regeneration of thiol-functionalized mesostructured silica adsorbents of mercury

被引：63

作者：

Arencibia, Amaya ^{[1
]}

Aguado, Jose ^{[1
]}

Arsuaga, Jesus M. ^{[1
]}

机构：

[1] Rey Juan Carlos Univ, Dept Chem & Environm Technol, Sch Expt Sci & Technol ESCET, Madrid 28933, Spain

来源：

APPLIED SURFACE SCIENCE | 2010年 / 256卷 / 17期

关键词：

Mesostructured silica; Thiol functionalization; Mercury removal; Adsorbent regeneration; HEAVY-METAL IONS; MESOPOROUS MATERIALS; ADSORPTION; SURFACE; MONOLAYERS; CAPACITY;

D O I：

10.1016/j.apsusc.2009.12.139

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The regeneration of thiol-functionalized SBA-15 adsorbents of mercury is presented in this article. The influence of temperature and pH on the adsorption process was studied. The effect due to the presence of complexing agents in aqueous solution on the desorption step was also evaluated. Hg(II) maximum adsorption capacities at different temperatures ranging from 20 degrees C to 60 degrees C were obtained and it was found that temperature does not affect the adsorption process. Mercury adsorption capacity was also determined in the presence of HNO(3) and HCl up to 3 M concentration. The comparison of the results showed that whereas hydrochloric acid exhibits an appreciable capacity to regenerate the thiol-functionalized SBA-15 adsorbent, the nitric acid results inefficient. The difference was attributed to the mercury complexing ability of chloride anion. Four complexing compounds, KBr, KSCN, (NH(2))(2)CS, and HBr were tested for desorbing mercury in regeneration experiments. All agents were able to remove significant amounts of adsorbed mercury, being hydrobromic acid the complexing compound that yields the best results. (C) 2010 Elsevier B. V. All rights reserved.

引用

页码：5453 / 5457

页数：5