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Effective Dye Removal from Waste Water Using a Novel Low-Cost NaOH-Modified Fly Ash

Published online by Cambridge University Press:  01 January 2024

Xiaoming Gao ,
Yuan Dai ,
Yu Zhang ,
Xiang Zhai  and
Feng Fu
Xiaoming Gao*
Affiliation:
Department of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan’an University, Yan’an, Shaanxi 716000, China
Yuan Dai
Affiliation:
Department of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan’an University, Yan’an, Shaanxi 716000, China
Yu Zhang
Affiliation:
Department of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan’an University, Yan’an, Shaanxi 716000, China
Xiang Zhai
Affiliation:
Department of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan’an University, Yan’an, Shaanxi 716000, China
Feng Fu
Affiliation:
Department of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan’an University, Yan’an, Shaanxi 716000, China
*
*E-mail address of corresponding author: [email protected]
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Abstract

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Dyes are toxic and considered to be extremely hazardous to natural environments. Hence, adsorbents to remove dyes from contaminated water are needed. To develop adsorbents with a high adsorption capacity for different dyes, easy separation, and low cost, a novel dye adsorbent was prepared by activating fly ash with NaOH. The adsorbent morphology, structure, and specific surface area were characterized using scanning electron microscopy, X-ray powder diffraction, and surface area measurements using N2 adsorption-desorption. The adsorption abilities of the synthesized adsorbents were examined based on methylene blue and acid fuchsin adsorption from water. The capabilities of the adsorbents as a function of adsorbent use, dye type, dye concentration, time, and pH were investigated and compared. The results for methylene blue and acid fuchsin adsorption were modeled using pseudo-second order kinetics and the Langmuir adsorption isotherm, respectively. These modified adsorbents synthesized from fly ash may provide a promising solution to purify dye-contaminated waste water with the advantages of high efficiency and low cost.

Keywords

Acid FuchsinAdsorptionDye AdsorptionMethylene BlueNaOH-Modified Fly AshWastewater Treatment
Type
Article
Information
Clays and Clay Minerals , Volume 64 , Issue 6 , December 2016 , pp. 695 - 705
Copyright
Copyright © Clay Minerals Society 2016

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