Algae decorated TiO2/Ag hybrid nanofiber membrane with enhanced photocatalytic activity for Cr(VI) removal under visible light

Wang, L., Zhang, C., Gao, F., Mailhot, G. and Pan, G. ORCID: 0000-0003-0920-3018, 2016. Algae decorated TiO2/Ag hybrid nanofiber membrane with enhanced photocatalytic activity for Cr(VI) removal under visible light. Chemical Engineering Journal: an International Journal of Research and Development. ISSN 1385-8947

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Abstract

Algae as an abundant natural biomass, more attention has been paid to explore its potential application in environmental pollutants treatment. This work prepared the algae-TiO2/Ag bionano hybrid material by loading algae cells on the ultrafine TiO2/Ag chitosan hybrid nanofiber mat. For the first time, the synergistic photocatalytic effect of fresh algae and TiO2/Ag nanomaterial was investigated by removal of Cr(VI). The addition of algae significantly improved the photo-removal of Cr(VI) in the system with TiO2/Ag hybrid nanomaterial under visible light irradiation. Meanwhile, the photocatalytic mechanism was studied. The photogenerated reactive oxygen species were quantified and the addition of algae apparently decreased the yields of •OH to 31.0 µM, while improved the yields of 1O2 and O2•− in the reaction system with TiO2/Ag hybrid nanofiber mats. The change of superoxide dismutase activity and malondialdehyde content in algae indicated that TiO2/Ag could impose oxidative stress and cause lipid peroxidation in algae cells. During the course of irradiation, algae released substances could act as scavenger for holes, thus inhibited the recombination of hole/electron and enhanced the photocatalytic reduction of Cr(VI) by electrons on TiO2 surface. Algae was simultaneously photodegraded in the system and the resulting O2•−, organic free radicals could promote the reduction of Cr(VI). This functional hybrid nanofiber mat was easily recovered and maintained a great photocatalytic activity on the five successive cycles. This algae-photocatalyst hybrid material has promising applications potential in heavy metal removal and organic pollutants treatment.

Item Type: Journal article
Publication Title: Chemical Engineering Journal: an International Journal of Research and Development
Creators: Wang, L., Zhang, C., Gao, F., Mailhot, G. and Pan, G.
Publisher: Elsevier
Date: 8 December 2016
ISSN: 1385-8947
Identifiers:
NumberType
10.1016/j.cej.2016.12.020DOI
S1385894716317673Publisher Item Identifier
Divisions: Schools > School of Animal, Rural and Environmental Sciences
Depositing User: Jill Tomkinson
Date Added: 08 Dec 2016 16:17
Last Modified: 09 Jun 2017 14:09
URI: http://irep.ntu.ac.uk/id/eprint/29305

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