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

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Title Comparison of properties and aquatic arsenic removal potentials of organically modified smectite adsorbents
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Subject Organic modification Smectite Arsenic Adsorption Water treatment Clay characterization
 
Description Not Available
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.
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Date 2019-10-15T04:02:12Z
2019-10-15T04:02:12Z
2019-05-01
 
Type Research Paper
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/23360
 
Language English
 
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Publisher Not Available