Adsorption kinetics and thermodynamics studies of gold(III) ions using thioctic acid functionalized silica coated magnetite nanoparticles

被引：70

作者：

Abd Razak, Nur Fadzilah ^{[1
]}

Shamsuddin, Mustaffa ^{[1
,2
]}

Lee, Siew Ling ^{[1
,2
]}

机构：

[1] Univ Teknol Malaysia, Dept Chem, Fac Sci, Utm Johor Bahru 81310, Johor, Malaysia

[2] Univ Teknol Malaysia, Ctr Sustainable Nanomat, Utm Johor Bahru 81310, Johor, Malaysia

来源：

CHEMICAL ENGINEERING RESEARCH & DESIGN | 2018年 / 130卷

关键词：

Thioctic acid; Adsorbent; Au(III) ions; Isotherm; Kinetics and thermodynamics; SELF-ASSEMBLED MONOLAYERS; ACTIVATED CARBON; SELECTIVE ADSORPTION; GOLD IONS; AQUEOUS-SOLUTIONS; BUCKWHEAT HULLS; WASTE-WATER; RECOVERY; EXTRACTION; BIOSORPTION;

D O I：

10.1016/j.cherd.2017.12.004

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Thioctic acid functionalized silica coated magnetite nanoparticles, RS-SR-NH-SiO2-Fe3O4, has been synthesized and its ability for the recovery of Au(III) in aqueous solutions was assessed. The results of the adsorption thermodynamics and kinetics showed that this magnetic adsorbent has good adsorption capacity for Au(III) and the best interpretation for the experimental data was given by the Langmuir isotherm model. The adsorption kinetics of RS-SR-NH-SiO2-Fe3O4 was well fitted with the pseudo-second-order rate equation. The thermodynamic parameters Delta G, Delta H and Delta S were also evaluated and the overall adsorption process was exothermic and spontaneous in nature. (C) 2017 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

引用

页码：18 / 28

页数：11

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