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Physicochemical stability of calcium-alginate beads immobilizing TiO2 nanoparticles for removal of cationic dye under UV irradiation

Lam, WH, Chong, MN, Amini Horri, B, Tey, BT and Chan, ES (2017) Physicochemical stability of calcium-alginate beads immobilizing TiO2 nanoparticles for removal of cationic dye under UV irradiation Journal of Applied Polymer Science.

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Abstract

Recently, there have been considerable interests to immobilize photocatalyst in alginate beads for removing pollutants from water sources. However, the feasibility of using alginate beads in industry largely depends on its long-term stability during operation. This study investigated the physicochemical stability of alginate/titanium dioxide beads (Alg/TiO2) when exposed to UV irradiation in aqueous environment. The degradation of Alg/TiO2 beads was evident because the diameter and mass of the beads was reduced by 12% and 40%, respectively, after 120 h of irradiation. A substantial amount of TiO2 was leached into the external medium. Consequently, the removal efficiency of model cationic dye was found to reduce after every process cycle. Morphological analysis showed the formation of cavities on the surface of the Alg/TiO2 beads. Interestingly, the blank alginate beads degraded more rapidly than the Alg/TiO2 beads, confirming the UV shielding effect of TiO2. Nevertheless, this study reveals the need to improve the UV stability of alginate-based beads before they can be considered for practical application. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 133, 45002.

Item Type: Article
Subjects : Chemical & Process Engineering
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
NameEmailORCID
Lam, WHUNSPECIFIEDUNSPECIFIED
Chong, MNUNSPECIFIEDUNSPECIFIED
Amini Horri, BUNSPECIFIEDUNSPECIFIED
Tey, BTUNSPECIFIEDUNSPECIFIED
Chan, ESUNSPECIFIEDUNSPECIFIED
Date : 7 March 2017
Identification Number : 10.1002/app.45002
Copyright Disclaimer : This is the peer reviewed version of the following article: Lam, W.-H., Chong, M. N., Horri, B. A., Tey, B.-T. and Chan, E.-S. (2017), Physicochemical stability of calcium-alginate beads immobilizing TiO2 nanoparticles for removal of cationic dye under UV irradiation. J. Appl. Polym. Sci., 45002. doi: 10.1002/app.45002, which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/app.45002/full. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 31 Mar 2017 16:58
Last Modified : 31 Oct 2017 19:11
URI: http://epubs.surrey.ac.uk/id/eprint/813757

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