Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.ese.2021.100097
Title: Magnetic poly(acrylic acid)-based hydrogels for rapid ammonium sorption and efficient sorbent separation from sewage
Authors: Cruz, Heidy 
Yap Gabon, M.
Salehin, Sirajus
Seviour, Thomas
Laycock, Bronwyn
Pikaar, Ilje
Keywords: Ammonium recovery
Magnetic nanoparticles
Polymer hydrogels
Resource recovery
Sewage
Wastewater treatment
Issue Date: 1-Apr-2021
Publisher: Elsevier B.V.
Citation: Cruz, Heidy, Yap Gabon, M., Salehin, Sirajus, Seviour, Thomas, Laycock, Bronwyn, Pikaar, Ilje (2021-04-01). Magnetic poly(acrylic acid)-based hydrogels for rapid ammonium sorption and efficient sorbent separation from sewage. Environmental Science and Ecotechnology 6 : 100097. ScholarBank@NUS Repository. https://doi.org/10.1016/j.ese.2021.100097
Rights: Attribution-NonCommercial-NoDerivatives 4.0 International
Abstract: Ammonium sorption and recovery processes typically take place in conventional packed columns, with a configuration that enables maximum sorption by the sorbents. However, batch or semi-continuous operations in packed columns have associated issues such as scaling and frequent backwashing requirements, which are economically prohibitive. As an alternative, ammonium sorption could occur in well-mixed continuously stirred tanks, which would allow for the ammonium sorption process to be retrofitted in existing wastewater treatment plants, provided that efficient sorbent separation can be achieved. This study demonstrates, for the first time, the preparation of magnetic poly(acrylic acid)-based (PAA) ammonium sorbents through the incorporation of magnetic (Fe3O4) nanoparticles (MNP) produced via scalable and cost-effective electrochemical synthesis. The MNP and PAA hydrogels were synthesized independently and the MNPs subsequently integrated into the PAA hydrogel network by particle diffusion and physical entrapment. No adverse effects on swelling and ammonium sorption following immersion in either synthetic or real sewage were observed after MNPs were incorporated into the hydrogels. Importantly, PAA-MNP hydrogels demonstrated high ammonium sorption efficiencies (80–93%) in real sewage and achieved rapid ammonium recovery of 73 ± 1.1% within 15 min of mild acid washing (pH 4) 15 min at a maximum recovery. © 2021
Source Title: Environmental Science and Ecotechnology
URI: https://scholarbank.nus.edu.sg/handle/10635/233212
ISSN: 2666-4984
DOI: 10.1016/j.ese.2021.100097
Rights: Attribution-NonCommercial-NoDerivatives 4.0 International
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