Degradation of azo dye orange II under dark ambient conditions by calcium strontium copper perovskite

Chen, Huihuang, Motuzas, Julius, Martens, Wayde and da Costa, Joao C. Diniz (2017) Degradation of azo dye orange II under dark ambient conditions by calcium strontium copper perovskite. Applied Catalysis B-Environmental, 221 691-700. doi:10.1016/j.apcatb.2017.09.056


Author Chen, Huihuang
Motuzas, Julius
Martens, Wayde
da Costa, Joao C. Diniz
Title Degradation of azo dye orange II under dark ambient conditions by calcium strontium copper perovskite
Journal name Applied Catalysis B-Environmental   Check publisher's open access policy
ISSN 0926-3373
1873-3883
Publication date 2017-09-27
Year available 2017
Sub-type Article (original research)
DOI 10.1016/j.apcatb.2017.09.056
Open Access Status Not yet assessed
Volume 221
Start page 691
End page 700
Total pages 10
Place of publication Amsterdam, The Netherlands
Publisher Elsevier
Language eng
Subject 1503 Catalysis
2300 Environmental Science
1508 Process Chemistry and Technology
Abstract This work investigates the effect of calcium strontium copper (CSC) based catalysts for the degradation of an azo dye orange II (OII) under dark conditions without the addition of peroxides or ozone. CSC were synthesized via a combined EDTA-citric acid complexation method. The resultant catalyst was composed of perovskite and metal oxide phases, however, the perovskite phase was the most active for degradation of OII. The content of Ca and Sr in the A-site of the perovskite structure was varied whilst the B-site was Cu rich. CSC compounds with higher Ca content in the A-site were slightly more effective at degrading OII. The degradation kinetics under dark conditions was fast with up to 80% of OII being degraded within 10 min. TOC results showed that the degradation was only partial as more than 60% of the organic carbon remained in the solution, supported by the formation of by-products determined by HPLC. The remainder of the carbon were found to be adsorbed on the surface of the spent CSC catalyst, as by-products of the reaction and OII molecules. The CSC catalyst proved to be effective for breaking -N=N- bonds from solutions containing low (10 ppm) to high (100 ppm) OII concentrations. This reaction produced electrons which generated radical species, including hydroxyl radicals as confirmed by 2-propanol, which further degraded OII and its by-products.
Keyword Visible-Light
Photocatalytic Degradation
Efficient Degradation
Catalytic-Activity
Organic-Dyes
Oxide
Adsorption
Oxidation
Surface
Oxygen
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID FT130100405
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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Created: Sat, 11 Nov 2017, 23:04:19 EST