Potential dissolution and photo-dissolution of ZnO thin films

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dc.contributor.author Han, Jie en
dc.contributor.author Qiu, W en
dc.contributor.author Gao, Wei en
dc.date.accessioned 2012-05-23T02:54:32Z en
dc.date.issued 2010 en
dc.identifier.citation JOURNAL OF HAZARDOUS MATERIALS 178(1-3):115-122 15 Jun 2010 en
dc.identifier.issn 0304-3894 en
dc.identifier.uri http://hdl.handle.net/2292/18198 en
dc.description.abstract Potential dissolution and photo-dissolution are important concerns for zinc oxide (ZnO) photocatalysts due to the possible results of catalyst inactivation and secondary pollution from free Zn2+. In this study, magnetron-sputtered ZnO thin films were prepared and exposed under a series of corrosive conditions. ZnO films suffered rapid dissolution under: (a) extreme pH levels (<= 5 or >= 11); (b) 1 mM ethylenediaminetetraacetic acid (EDTA)solution; (c) UV (lambda = 254 nm). The dissolution rate of ZnO films was moderate at pH = 6 and decreased markedly as pH increased to 7. It continued to decrease as pH increased from 7 to 10, then the trend quickly reversed as pH increased further. The lowest dissolution rate was obtained at pH = 10, with only 1.2% ZnO dissolved after 24 h of exposure. Minimal dissolution was observed on ZnO films in alkalised 1 mM oxalate and acetate solutions. Pitting corrosion was observed on ZnO films after UV irradiation, which was ascribed to photo-generated holes on surface defect sites. The presence of hole scavengers (Na2SO3) caused significant suppression on ZnO photo-dissolution. This suppression effect remained in place until hole scavengers were completely consumed, from where the photo-dissolution rates accelerated. (C) 2010 Elsevier B.V. All rights reserved. en
dc.publisher Elsevier B.V. en
dc.relation.ispartofseries Journal of Hazardous Materials en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from http://www.sherpa.ac.uk/romeo/issn/0304-3894/ en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.subject Zinc oxide Photocatalyst Dissolution Photo-dissolution photocatalytic degradation aqueous-solutions zinc acetate doped zno azo-dye oxide nanoparticles suspensions transition efficiency en
dc.title Potential dissolution and photo-dissolution of ZnO thin films en
dc.type Journal Article en
dc.identifier.doi 10.1016/j.jhazmat.2010.01.050 en
pubs.issue 1-3 en
pubs.begin-page 115 en
pubs.volume 178 en
dc.rights.holder Copyright: Elsevier B.V. en
dc.identifier.pmid 20122799 en
pubs.end-page 122 en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 186689 en
pubs.org-id Engineering en
pubs.org-id Chemical and Materials Eng en
pubs.record-created-at-source-date 2012-05-16 en
pubs.dimensions-id 20122799 en

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