Enhancing the performance of porous rice husk silica through branched polyethyleneimine grafting for phosphate adsorption

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 perform...

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Main Authors: Suzaimi, N.D., Goh, P.S., Malek, N.A.N.N., Lim, J.W., Ismail, A.F.
Format: Article
Institution: Universiti Teknologi Petronas
Record Id / ISBN-0: utp-eprints.30070 /
Published: Elsevier B.V. 2020
Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85087808393&doi=10.1016%2fj.arabjc.2020.06.023&partnerID=40&md5=c4e36c6c4d3820f2edf3c048cb957972
http://eprints.utp.edu.my/30070/
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spelling utp-eprints.300702022-03-25T03:23:05Z Enhancing the performance of porous rice husk silica through branched polyethyleneimine grafting for phosphate adsorption Suzaimi, N.D. Goh, P.S. Malek, N.A.N.N. Lim, J.W. Ismail, A.F. 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 qm 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. © 2020 Elsevier B.V. 2020 Article NonPeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85087808393&doi=10.1016%2fj.arabjc.2020.06.023&partnerID=40&md5=c4e36c6c4d3820f2edf3c048cb957972 Suzaimi, N.D. and Goh, P.S. and Malek, N.A.N.N. and Lim, J.W. and Ismail, A.F. (2020) Enhancing the performance of porous rice husk silica through branched polyethyleneimine grafting for phosphate adsorption. Arabian Journal of Chemistry, 13 (8). pp. 6682-6695. http://eprints.utp.edu.my/30070/
institution Universiti Teknologi Petronas
collection UTP Institutional Repository
description 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 qm 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. © 2020
format Article
author Suzaimi, N.D.
Goh, P.S.
Malek, N.A.N.N.
Lim, J.W.
Ismail, A.F.
spellingShingle Suzaimi, N.D.
Goh, P.S.
Malek, N.A.N.N.
Lim, J.W.
Ismail, A.F.
Enhancing the performance of porous rice husk silica through branched polyethyleneimine grafting for phosphate adsorption
author_sort Suzaimi, N.D.
title Enhancing the performance of porous rice husk silica through branched polyethyleneimine grafting for phosphate adsorption
title_short Enhancing the performance of porous rice husk silica through branched polyethyleneimine grafting for phosphate adsorption
title_full Enhancing the performance of porous rice husk silica through branched polyethyleneimine grafting for phosphate adsorption
title_fullStr Enhancing the performance of porous rice husk silica through branched polyethyleneimine grafting for phosphate adsorption
title_full_unstemmed Enhancing the performance of porous rice husk silica through branched polyethyleneimine grafting for phosphate adsorption
title_sort enhancing the performance of porous rice husk silica through branched polyethyleneimine grafting for phosphate adsorption
publisher Elsevier B.V.
publishDate 2020
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85087808393&doi=10.1016%2fj.arabjc.2020.06.023&partnerID=40&md5=c4e36c6c4d3820f2edf3c048cb957972
http://eprints.utp.edu.my/30070/
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score 11.62408

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