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Harnessing wood bottom ash for efficient arsenic removal from wastewater: Adsorption mechanisms and process optimisation

This study explored the innovative application of wood bottom ash (WBA) as an adsorbent for arsenic (As) removal from wastewater, focusing on the adsorption mechanism and optimisation of the operational conditions. Comprehensive spectroscopic analyses, including FE-SEM/EDS, BET, XRF, XRD, FT-IR, and...

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Published in:Chemosphere (Oxford) 2024-09, Vol.364, p.143204, Article 143204
Main Authors: Lee, Jae-In, Jeong, Yohan, Lee, Youn-Jun, Lee, Chang-Gu, Park, Seong-Jik
Format: Article
Language:English
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Summary:This study explored the innovative application of wood bottom ash (WBA) as an adsorbent for arsenic (As) removal from wastewater, focusing on the adsorption mechanism and optimisation of the operational conditions. Comprehensive spectroscopic analyses, including FE-SEM/EDS, BET, XRF, XRD, FT-IR, and XPS, were performed to examine the elemental and mineralogical changes in WBA before and after As adsorption. The study assessed the adsorption kinetics and isotherms, revealing that As adsorption reached equilibrium within 48 h, with a maximum capacity of 121.13 mg/g. The adsorption process followed a pseudo-second-order kinetic model and aligned well with the Langmuir isotherm, indicating that the process is governed by chemisorption and occurs as monolayer adsorption. The primary removal mechanism was the surface precipitation of amorphous calcium arsenate. Response surface methodology was employed to analyse and optimise the factors influencing As removal, including solution pH, ionic strength, adsorbent dose and reaction time. The optimal conditions for maximum As removal were pH 7.11, 8.37 mM ionic strength, 9.08 g/L WBA dose, and 2.58 h reaction time. This study offers novel insights into the efficient and cost-effective use of WBA for As removal, highlighting its potential as a sustainable solution for wastewater treatment in developing countries. [Display omitted] •Wood bottom ash effectively adsorbs arsenic, achieving a capacity of 121.13 mg/g.•WBA was mainly Ca (56.6%) and C (32.5%), with Ca as CaCO3 (71.3%) and Ca(OH)2 (28.7%).•The primary adsorption mechanism is the surface precipitation of amorphous calcium arsenate.•Optimal arsenic removal conditions include pH 7.11, 8.37 mM ionic strength, 9.08 g/L WBA dose and 2.58 h reaction time.
ISSN:0045-6535
1879-1298
1879-1298
DOI:10.1016/j.chemosphere.2024.143204