Enhanced adsorption capacity and selectivity toward inorganic and organic mercury ions from aqueous solution by dye-affinity adsorbents

Saman, N. and Johari, K. and Song, S.-T. and Kong, H. and Cheu, S.-C. and Mat, H. (2019) Enhanced adsorption capacity and selectivity toward inorganic and organic mercury ions from aqueous solution by dye-affinity adsorbents. Environmental Progress and Sustainable Energy, 38 (s1). S54-S67. ISSN 19447442

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Abstract

Adsorption of inorganic mercury Hg(II) and organic methylmercury MeHg(II) ions onto dye-affinity agrowaste (dye-AW) was investigated. The dye-affinity adsorbents were prepared by the chemical-thermal reaction between the agrowaste (AW) and dye solutions i.e., Reactive Red 120 (RR), Reactive Black B (RB), Methylene Blue (MB), and Methyl Orange (MO) under an alkaline condition. An almost perfect removal of Hg(II) was observed for all adsorbents, while for MeHg(II), the dye-affinity adsorbents have a higher removal efficiency than a pristine adsorbent. The maximum adsorption capacity (Q e, max ) of mercury ions onto the Reactive Red 120-modified AW (RR-AW) was 2.60 mmol g �1 for Hg(II) and 0.76 mmol g �1 for MeHg(II). The adsorption rate of Hg(II) was faster than MeHg(II), and both kinetic data followed the pseudo-second order kinetic model with the diffusion steps controlled by the film diffusion. The regenerated adsorbent showed very encouraging results especially toward Hg(II). The promising results were also obtained by using oilfield produced water (OPW) and natural gas condensate (NGC) samples. These studies finally demonstrated that the agricultural wastes initially loaded with dyes have the potential to be good mercury adsorbents. © 2018 American Institute of Chemical Engineers Environ Prog, 38: S54�S67, 2019. © 2018 American Institute of Chemical Engineers

Item Type: Article
Additional Information: cited By 5
Uncontrolled Keywords: Adsorbents; Adsorption; Agricultural wastes; Agriculture; Alkalinity; Aromatic compounds; Azo dyes; Dyeing; Dyes; Gas condensates; Ions; Mercury (metal); Oil fields; Solutions, Adsorption capacities; Alkaline conditions; Enhanced adsorptions; Mercury adsorbents; Oilfield produced waters; Pseudo-second-order kinetic models; Removal efficiencies; Thermal reactions, Mercury compounds
Depositing User: Mr Ahmad Suhairi UTP
Date Deposited: 10 Nov 2023 03:26
Last Modified: 10 Nov 2023 03:26
URI: https://khub.utp.edu.my/scholars/id/eprint/11757

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