Journal
ARABIAN JOURNAL OF CHEMISTRY
Volume 13, Issue 8, Pages 6682-6695Publisher
ELSEVIER
DOI: 10.1016/j.arabjc.2020.06.023
Keywords
Phosphate; Adsorption; Branched polyethyleneimine; Rice husk nano-adsorbent; Porous silica
Categories
Funding
- Ministry of Higher Education Malaysia under Fundamental Research Grant Scheme (FRGS) [5F005]
- Ministry of Higher Education Malaysia under HiCOE grant [4J435]
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Removal of phosphate is necessary to prevent eutrophication and remediate other environmental issues. In this study, branched polyethyleneimine (bPEI) was grafted onto rice husk porous silica (RSi-bPEI) to enhance the selective adsorption of phosphate. The adsorption tests for phosphate were performed at various conditions to assess the effects of pH, dose, initial concentration, and contact time. As confirmed by FTIR-spectra, it was proposed that phosphate species anchored onto RSi-bPEI through ion-exchange and hydrogen bonding. The increase in positive charge of RSi-bPEI, which was due to the presence of protonated amine, played a key role in offering more adsorption sites to augment the adsorption by means of electrostatic attraction. Consequently, RSi-bPEI exhibited q(m) of 123.46 mg g(-1), which was two-fold better than that of RSi. The adsorption behavior was best described by Langmuir isotherms and the pseudo-second-order kinetics model. Based on the competitive study, the co-existing anions did not interfere with adsorption due to the fact that phosphate could form both inner and outer sphere complexes. In addition to the high performance, high efficiency in wide pH range as well as good stability and easy recyclability are the other promising criteria of RSi-bPEI that promote its practical usage in treating phosphate-induced eutrophication of water bodies. (C) 2020 Published by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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