Removal of organochlorine pesticides using zerovalent iron supported on biochar nanocomposite from Nephelium lappaceum (Rambutan) fruit peel waste

Batool, Samavia and Shah, Athar Ali and Abu Bakar, Ahmad Farid and Maah, Mohd Jamil and Abu Bakar, Nor Kartini (2022) Removal of organochlorine pesticides using zerovalent iron supported on biochar nanocomposite from Nephelium lappaceum (Rambutan) fruit peel waste. Chemosphere, 289. ISSN 0045-6535, DOI

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Unique zerovalent iron (Fe-0) supported on biochar nanocomposite (Fe-0-B-RtP) was synthesized from Nephelium lappaceum (Rambutan) fruit peel waste and were applied for the simultaneous removal of 6 selected organochlorine pesticides (OCPs) from aqueous medium. During facile synthesis of Fe-0-B-RtP, Rambutan peel extract was used as the green reducing mediator to reduce Fe2+ to zerovalent iron (Fe-0), instead of toxic sodium borohydride which were used for chemical synthesis. For comparison, chemically synthesized Fe-0-B-Che nanocomposite was also prepared in this work. Characterization study confirmed the successful synthesis and dispersion of Fe-0 nanoparticles on biochar surface. Batch experiments revealed that Fe-0-B-RtP and Fe-0-B-Che nanocomposites combine the advantage of adsorption and dechlorination of OCPs in aqueous medium and up to 96-99% and 83-91% removal was obtained within 120 and 150 min, respectively at initial pH 4. Nevertheless, the reactivity of Fe-0-B-Che nanocomposite decreased 2 folds after being aged in air for one month, whilst Fe-0-B-RtP almost remained the same. Adsorption isotherm of OCPs were fitted well to Langmuir isotherm and then to Freundlich isotherm. The experimental kinetic data were fitted first to pseudo-second-order adsorption kinetic model and then to pseudo-first-order reduction kinetic model. The adsorption mechanism involves pi-pi electron-donor-acceptor interaction and adsorption is facilitated by the hydrophobic sorption and pore filling. After being reused five times, the removal efficiency of regenerated Fe-0-B-Che and Fe-0-B-RtP was 5-13% and 89-92%, respectively. The application of this Fe-0-B-RtP nanocomposite could represent a green and low-cost potential material for adsorption and subsequent reduction of OCPs in aquatic system.

Item Type: Article
Funders: University Malaya Research Grant (UMRG), AFR (Frontier Science)[RP018-14AFR], Universiti Malaya, Malaysia[PG111-2015A], Universiti Malaya, Malaysia[BK058-2015]
Uncontrolled Keywords: Organochlorine pesticides;Nephelium lappaceum peel waste; Peel extract;Zerovalent iron-biochar nanocomposite;Removal; Dechlorination;Regeneration
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Q Science > QK Botany
S Agriculture > SD Forestry
Divisions: Faculty of Science
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 28 Jul 2022 03:18
Last Modified: 28 Jul 2022 03:18

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