Arsenic adsorption mechanism on palm oil fuel ash (POFA) powder suspension

Mohamad Sukri, Mohamad Yusof and Mohd Hafiz Dzarfan, Othman and Roswanira, Abdul Wahab and Khairulazhar, Jumbri and Fazira Ilyana, Abdul Razak and Kurniawan, Tonni Agustiono and Rozaimi, Abu Samah and Azeman, Mustafa and Mukhlis, A. Rahman and Juhana, Jaafar and Ahmad Fauzii, Ismail (2020) Arsenic adsorption mechanism on palm oil fuel ash (POFA) powder suspension. Journal of Hazardous Materials, 383 (121214). pp. 1-10. ISSN 0304-3894. (Published)

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The contribution of palm oil fuel ash (POFA), an agricultural waste as a low cost adsorbent for the removal of arsenite (As(III)) and arsenate (As(V)) was explored. Investigation on the adsorbency characteristics of POFA suspension revealed that the surface area, particle size, composition, and crystallinity of the SiO2 rich mullite structure were the crucial factors in ensuring a high adsorption capacity of the ions. Maximum adsorption capacities of As(III) and As(V) at 91.2 and 99.4 mg g−1, respectively, were obtained when POFA of 30 μm particle size was employed at pH 3 with the highest calcination temperature at 1150 °C. An optimum dosage of 1.0 g of dried POFA powder successfully removed 48.7% and 50.2% of As(III) and As(V), respectively. Molecular modeling using the density functional theory consequently identified the energy for the proposed reaction routes between the SiO− and As+ species. The high stability of the POFA suspension in water in conjunction with good adsorption capacity of As(III) and As(V) seen in this study, thus envisages its feasibility as a potential alternative absorbent for the remediation of water polluted with heavy metals.

Item Type: Article
Additional Information: Indexed by Scopus
Uncontrolled Keywords: Water and wastewater treatment; Agricultural waste; Low cost adsorbent; Heavy metal; BET analysis
Subjects: T Technology > TD Environmental technology. Sanitary engineering
T Technology > TP Chemical technology
Faculty/Division: Faculty of Chemical & Natural Resources Engineering
Depositing User: Mrs Norsaini Abdul Samat
Date Deposited: 27 Mar 2020 02:46
Last Modified: 27 Mar 2020 02:46
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