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. |
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dc.publisher |
Elsevier B.V. |
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dc.relation.ispartofseries |
Journal of Hazardous Materials |
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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 |
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dc.type |
Journal Article |
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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 |