Enhanced adsorption of mercury ions on thiol derivatized single wall carbon nanotubes

被引：159

作者：

Bandaru, Narasimha Murthy ^{[1
]}

Reta, Nekane ^{[2
]}

Dalal, Habibullah ^{[1
]}

Ellis, Amanda V. ^{[1
]}

Shapter, Joseph ^{[1
]}

Voelcker, Nicolas H. ^{[2
]}

机构：

[1] Flinders Univ S Australia, Sch Chem & Phys Sci, Flinders Ctr NanoScale Sci & Technol, Adelaide, SA 5001, Australia

[2] Univ S Australia, Mawson Inst, Mawson Lakes, SA 5095, Australia

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2013年 / 261卷

基金：

澳大利亚研究理事会;

关键词：

Single walled carbon nanotube; Thiol; Mercury; Adsorption; Desorption; Nanomaterials; AQUEOUS-SOLUTIONS; RAMAN-SPECTROSCOPY; ACTIVATED CARBON; REMOVAL; SILICA; NANOPARTICLES; DESORPTION; SURFACE; HG(II); WATER;

D O I：

10.1016/j.jhazmat.2013.07.076

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Thiol-derivatized single walled carbon nanotube (SWCNT-SH) powders were synthesized by reacting acid-cut SWCNTs with cysteamine hydrochloride using carbodiimide coupling. Infrared (IR) spectroscopy, Raman spectroscopy and thermogravimetric analysis confirmed the successful functionalization of the SWCNTs. SWCNT-SH powders exhibited a threefold higher adsorption capacity for Hg(II) ions compared to pristine SWCNTs, and a fourfold higher adsorption capacity compared to activated carbon. The influence of adsorption time, pH, initial metal concentration and adsorbent dose on Hg(II) ion removal was investigated. The maximum adsorption capacity of the SWCNT-SH powders was estimated by using equilibrium isotherms, such as Freundlich and Langmuir, and the maximum adsorption capacity of the SWCNT-SH powder was found to be 131 mg/g. A first-order rate model was employed to describe the kinetic adsorption process of Hg(II) ions onto the SWCNT-SH powders. Desorption studies revealed that Hg(II) ions could be easily removed from the SWCNT-SH powders by altering the pH. Further, the adsorption efficiency of recovered SWCNT-SH powders was retained up to 91%, even after 5 adsorption/desorption cycles. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：534 / 541

页数：8

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