Adsorption of thorium from aqueous solution by HDTMA+-pillared bentonite

You-Qun Wang; Zhi-bin Zhang; Qin Li; Yun-Hai Liu

doi:10.1007/s10967-012-1793-z

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 293: Issue 2

Adsorption of thorium from aqueous solution by HDTMA⁺-pillared bentonite

Authors:

You-Qun Wang

You-Qun Wang

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Zhi-bin Zhang

Zhi-bin Zhang

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Qin Li

Qin Li

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Yun-Hai Liu

Yun-Hai Liu

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Pages:: 519–528

Online Publication Date:: 27 Apr 2012

Publication Date:: 01 Aug 2012

Article Category:: Research Article

DOI:: https://doi.org/10.1007/s10967-012-1793-z

Keywords:: Hexadecyltrimethylammonium bromide; Bentonite; Adsorption; Thorium

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Abstract

The ability of hexadecyltrimethylammonium cation pillared bentonite (HDTMA⁺-bentonite) has been explored for the removal and recovery of thorium from aqueous solutions. The adsorbent was characterized using small-angle X-ray diffraction, high resolution transmission electron microscopy and Fourier transform infrared spectroscopy. The influences of different experimental parameters such as solution pH, initial thorium concentration, contact time and temperature on adsorption were investigated. The HDTMA⁺-bentonite showed the highest thorium sorption capacity at initial pH of 3.5 and contact time of 60 min. Adsorption kinetics was better described by the pseudo-second-order model and adsorption process could be well defined by the Langmuir isotherm. The thermodynamic parameters, ∆G° (298 K), ∆H° and ∆S° were determined to be −31.78, −23.71 kJ/mol and 27.10 J/mol K, respectively, which demonstrated the sorption process of HDTMA⁺-bentonite towards Th(VI) was feasible, spontaneous and exothermic in nature. The adsorption on HDTMA⁺-bentonite was more favor than Na-bentonite, in addition the saturated monolayer sorption capacity increased from 17.88 to 31.20 mg/g at 298 K after HDTMA⁺ pillaring. The adsorbed HDTMA⁺-bentonite could be effectively regenerated by 0.1 mol/L HCl solution for the removal and recovery of Th(VI). Complete removal (99.9 %) of Th(VI) from 1.0 L industry wastewater containing 16.8 mg Th(VI) ions was possible with 7.0 g HDTMA⁺-bentonite.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)