Comparison of properties and aquatic arsenic removal potentials of organically modified smectite adsorbents

Mukhopadhyay, Raj and Manjaiah, K. M. and Datta, S. C. and Sarkar, Binoy (2019) Comparison of properties and aquatic arsenic removal potentials of organically modified smectite adsorbents. Journal of Hazardous Materials, 377. pp. 124-131. ISSN 0304-3894

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Abstract

Arsenic (As)poses a tremendous threat to human health due to exposure through arsenic-contaminated drinking water and/or food. We aimed to develop organically modified clay adsorbents for the removal of As from aqueous solution. We modified a smectite sample using three organic agents, namely hexadecyl trimethylammonium (HDTMA), chitosan and citric acid, and characterized the products using X-ray diffraction, infrared spectroscopy, and scanning electron microscopy techniques. The characterization techniques suggested successful organic modifications of the smectite sample. The surfactant-modified smectite was the most efficient (66.9%)As removing adsorbent with a maximum adsorption capacity of 473.2 μg g−1. Kinetic study showed that the adsorbents reached As adsorption equilibrium within 3 h, and the data fitted reasonably well to power function and simple Elovich equations (R2 > 0.89). The adsorption data were explained well by the Freundlich and Sips isothermal models. The surfactant-modified and chitosan-grafted organoclays adsorbed As by electrostatic attraction and anion exchange, whereas the citric acid activated smectite followed ligand exchange and simple anion exchange mechanisms. This study thus demonstrated the potential of surfactant-modified clays in removing As from contaminated waters.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Hazardous Materials
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2300/2307
Subjects:
ID Code:
140133
Deposited By:
Deposited On:
14 Jan 2020 16:10
Refereed?:
Yes
Published?:
Published
Last Modified:
23 Sep 2020 05:55