Reduction and adsorption co-processes for selenate removal by zeolite-supported nanoscale zero-valent iron

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Published: Nov 10, 2021
Keywords:
Selenate Selenium Fly ash Zeolite Nanoscale zero-valent iron Adsorption

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Jakkapop Phanthasri
Department of Environmental Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen 40002, Thailand
Dickson Y.S. Yan
Faculty of Science & Technology, The Technological and Higher Education Institute of Hong Kong, New Territories, Hong Kong
Kitirote Wantala
Department of Chemical Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen 40002, Thailand
Rattabal Khunphonoi
Department of Environmental Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen 40002, Thailand
Visanu Tanboonchuy
Department of Environmental Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen 40002, Thailand

Abstract

The removal of selenate (Se6+) from aqueous solutions by zeolite Na-P1 supported nanoscale zero-valent iron (Z-NZVI) was investigated. Zeolite was synthesized from the fly ash of the byproducts discharged from coal-fired power, and used as supporting material for NZVI. The synthesized Z-NZVI was characterized using various techniques including x-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and BET surface area analysis, and. The results revealed that iron nanoparticles were highly dispersed on the zeolite surfaces which apparently lessened the agglomeration of iron nanoparticles resulting in the enhanced reduction process. The adsorption of Se6+ on Z-NZVI related well with Langmuir isotherm model with maximum adsorption capacity of 15.432 mg·g-1. The experimental results showed that the removal of Se6+ by Z-NZVI increased when the temperature increased. The reactions were found to conform to pseudo second order kinetics. The reaction process occurred spontaneously (-ΔG°), in an endothermic process (ΔH°=29.6 J·mol-1), and with increased randomness (ΔS°=97.17 J·mol-1K-1). This study suggested that Z-NZVI is a promising and efficient material for the selenate removal from wastewater.

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How to Cite
Phanthasri, J. ., Yan, D. Y. ., Wantala, K. ., Khunphonoi, R. ., & Tanboonchuy, V. . (2021). Reduction and adsorption co-processes for selenate removal by zeolite-supported nanoscale zero-valent iron. Engineering and Applied Science Research, 49(3), 363–372. Retrieved from https://ph01.tci-thaijo.org/index.php/easr/article/view/246567
Issue
Vol. 49 No. 3 (2022)
Section
ORIGINAL RESEARCH

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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