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Studies of Cr(VI) adsorption on novel jute cellulose-kaolinite clay biocomposite

DOI:10.5004/dwt.2018.22769
Authors:
Md Minhajul Islam at University of Dhaka
Md Minhajul Islam
Shanta Biswas at University of Dhaka
Shanta Biswas
M. Mehedi Hasan at Bangabandhu Sheikh Mujibur Rahman Science & Technology University
M. Mehedi Hasan
Papia Haque at University of Dhaka
Papia Haque
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Abstract

In this article, we have described the adsorption behavior of a biocomposite adsorbent prepared from crystalline cellulose of jute and kaolinite clay (locally available as Bijoypur clay). Despite lacking structural advantages such as smectite type montmorillonite clay used in other composites, this cellulose-clay composite showed good adsorption capacity. Cellulose was extracted from jute fiber and clay was modified with a surfactant named dodecylamine to prepare the biocomposite adsorbent. Effect of pH and contact time was investigated to figure out chromium adsorption capacity of the adsorbent. Maximum adsorption capacity was obtained at pH 4. The concentration of chromium in the test solution was determined by UV-spectrophotometer. The morphology of the composite was investigated using scanning electron microscope. Differential scanning calorimetry and thermogravimetric analysis of composite were carried out to investigate thermal behavior of the composite. The composite was characterized before and after adsorption experiment using Fourier-transform infrared spectroscopy and X-ray diffraction to validate the interaction of adsorbate chromium with adsorbent. Adsorption data of chromium by the adsorbent was analyzed according to Freundlich, Langmuir, Dubinin–Radushkevich, and Temkin adsorption models. Maximum adsorption capacity calculated from Langmuir isotherm model was 11.76 mg g–1 which was closer to results obtained experimentally. Pseudo-first-order, pseudo-second-order, and intraparticle diffusion kinetic models were proposed to understand the mechanism controlling the adsorption process. Moreover, this biocomposite was easily regenerated in sodium hydroxide solution and a maximum chromium desorption of 81.9% was achieved, which enabled the scope of reusability. Finally, a mechanism was proposed with illustration to show the adsorption potential of the composite.
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Desalination and Water Treatment
www.deswater.com
doi: 10.5004/dwt.2018.22769
123 (2018) 265–276
August
Studies of Cr(VI) adsorption on novel jute cellulose-kaolinite clay biocomposite
Md. Minhajul Islama, Shanta Biswasa, M. Mehedi Hasanb, Papia Haquea,
Sunzida H. Rimub, Mohammed Mizanur Rahmana,b,*
aDepartment of Applied Chemistry and Chemical Engineering, Faculty of Engineering and Technology, University of Dhaka,
Dhaka 1000, Bangladesh, Tel. +880-2-9661920-70/7392; Fax: +880-2-9667222; email: mizanur.rahman@du.ac.bd (M.M. Rahman)
bNational Institute of Textile Engineering and Research, Nayarhat, Savar, Dhaka
Received 13 February 2018; Accepted 5 July 2018
abstract
In this article, we have described the adsorption behavior of a biocomposite adsorbent prepared from
crystalline cellulose of jute and kaolinite clay (locally available as Bijoypur clay). Despite lacking
structural advantages such as smectite type montmorillonite clay used in other composites, this cel-
lulose-clay composite showed good adsorption capacity. Cellulose was extracted from jute fiber and
clay was modified with a surfactant named dodecylamine to prepare the biocomposite adsorbent.
Effect of pH and contact time was investigated to figure out chromium adsorption capacity of the
adsorbent. Maximum adsorption capacity was obtained at pH 4. The concentration of chromium in
the test solution was determined by UV-spectrophotometer. The morphology of the composite was
investigated using scanning electron microscope. Differential scanning calorimetry and thermograv-
imetric analysis of composite were carried out to investigate thermal behavior of the composite. The
composite was characterized before and after adsorption experiment using Fourier-transform infrared
spectroscopy and X-ray diffraction to validate the interaction of adsorbate chromium with adsorbent.
Adsorption data of chromium by the adsorbent was analyzed according to Freundlich, Langmuir,
Dubinin–Radushkevich, and Temkin adsorption models. Maximum adsorption capacity calculated
from Langmuir isotherm model was 11.76 mg g–1 which was closer to results obtained experimentally.
Pseudo-first-order, pseudo-second-order, and intraparticle diffusion kinetic models were proposed
to understand the mechanism controlling the adsorption process. Moreover, this biocomposite was
easily regenerated in sodium hydroxide solution and a maximum chromium desorption of 81.9% was
achieved, which enabled the scope of reusability. Finally, a mechanism was proposed with illustra-
tion to show the adsorption potential of the composite.
Keywords: Biocomposite; Kaolinite; Crystalline cellulose; Chromium; Clay
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