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Evaluation of Surfactant-Modified Bentonite for Acid Red 88 Dye Adsorption in Batch Mode: Kinetic, Equilibrium, and Thermodynamic Studies Publisher



Khatibi AD1 ; Yilmaz M2 ; Mahvi AH3 ; Balarak D1 ; Salehi S4
Authors
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Authors Affiliations
  1. 1. Department of Environmental Health, Health Promotion Research Center, Zahedan University of Medical Sciences, Zahedan, Iran
  2. 2. Osmaniye Korkut Ata University, Faculty of Engineering, Department of Chemical Engineering, Osmaniye, 80000, Turkey
  3. 3. Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
  4. 4. Student Research Committee, Zahedan University of Medical Sciences, Zahedan, Iran

Source: Desalination and Water Treatment Published:2022


Abstract

In this study, hexadecyltrimethylammonium (HDTMA) bentonite was synthesized by placing alkylammonium cation onto bentonite. Acid Red 88 (AR88) removal by hexadecyltrimethylammo-nium (HDTMA) modified bentonite was investigated and the specific surface area obtained using Brunauer–Emmett–Teller analysis was 49.2 m2/g for HDTMA-bentonite. However, for natural bentonite, it was only 17.4 m2/g. The effect of main experimental parameters on the removal of AR88 (i.e., initial AR88 concentration, contact time, and HDTMA-bentonite mass) was investigated. Also, six isotherm models were applied for evaluation of the equilibrium adsorption; among the mentioned models, fitting the adsorption data on Langmuir isotherm was associated with superior results (maximum monolayer capacity (qmax) was 91.7 mg/g). The results gave the green light to the unique usability of the pseudo-second-order kinetics model for the portrayal of adsorption data. Using the intraparticle diffusion model, the identification of the adsorption mechanism process was done so that the trivial effect of the boundary layer was confirmed. Based on Boyd’s kinetic model, the external mass transport was the foremost reason for the adsorption of water from dye– water mixtures. In addition, there is no study in the literature on the removal of Acid Red 88 dye using HDTMA-bentonite. The obtained results indicated that, through using HDTMA-bentonite, the elimination of acid dyes from aqueous solutions can occur simply and in a short time. © 2022 Desalination Publications. All rights reserved.
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