Title: Kinetics of methylene blue dye adsorption from water using modified fly ash

Authors: Shuyue Zhang; Qi Zhu; Yuanfeng Hui

Addresses: College of Resources and Environment Engineering, Jilin Institute of Chemical Technology, Jilin, China ' College of Resources and Environment Engineering, Jilin Institute of Chemical Technology, Jilin, China ' College of Resources and Environment Engineering, Jilin Institute of Chemical Technology, Jilin, China

Abstract: The effective removal of dye from wastewater is important to curb its harmful effects on the environment and human health. In this study, a combined acidic/ultrasonic method was used to modify fly ash (FA) and utilise it as an adsorbent for methylene blue (MB) dye. The absorption rate of MB reached a maximum of 89.12% at a MB concentration of 30 mg/L, pH of 10, temperature of 20°C, adsorption time of 120 min, and adsorbent dose of 4 g/L. Fits to the adsorption isotherm and adsorption kinetic curve with the Freundlich and pseudo-second-order kinetic models, respectively, revealed chemisorption of MB on FA. This study presents a novel, cost-effective, and energy-saving method for modifying raw fly ash (RFA) to yield an efficient adsorbent with potential for industrial dye wastewater treatment.

Keywords: modify fly ash; methylene blue dye; absorption; aid/ultrasonic method; kinetic models.

DOI: 10.1504/IJGW.2023.132277

International Journal of Global Warming, 2023 Vol.30 No.4, pp.413 - 429

Received: 01 Oct 2022
Received in revised form: 28 Jan 2023
Accepted: 29 Jan 2023
Published online: 14 Jul 2023 *

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