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Effect of phosphate on heterogeneous Fenton oxidation of catechol by nano-Fe3O4: Inhibitor or stabilizer?
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing.
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing.
University of Jinan, Institute of Chemistry and Chemical Engineering, University of Jinan, School of Chemistry and Chemical Engineering, University of Jinan.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0001-9794-8305
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Number of Authors: 52016 (English)In: Journal of Environmental Sciences(China), ISSN 1001-0742, E-ISSN 1878-7320, Vol. 39, p. 69-76Article in journal (Refereed) Published
Abstract [en]

The effect of phosphate on adsorption and oxidation of catechol, 1,2-dihydroxybenzene, in a heterogeneous Fenton system was investigated. In situ attenuated total reflectance infrared spectroscopy (ATR-FTIR) was used to monitor the surface speciation at the nano-Fe3O4 catalyst surface. The presence of phosphate decreased the removal rate of catechol and the abatement of dissolved organic compounds, as well as the decomposition of H2O2. This effect of phosphate was mainly due to its strong reaction with surface sites on the iron oxide catalyst. At neutral and acid pH, phosphate could displace the adsorbed catechol from the surface of catalyst and also could compete for surface sites with H2O2. In situ IR spectra indicated the formation of iron phosphate precipitation at the catalyst surface. The iron phosphate surface species may affect the amount of iron atoms taking part in the catalytic decomposition of H2O2 and formation of hydroxyl radicals, and inhibit the catalytic ability of Fe3O4 catalyst. Therefore, phosphate ions worked as stabilizer and inhibitor in a heterogeneous Fenton reaction at the same time, in effect leading to an increase in oxidation efficiency in this study. However, before use of phosphate as pH buffer or H2O2 stabilizer in a heterogeneous Fenton system, the possible inhibitory effect of phosphate on the actual removal of organic pollutants should be fully considered.

Place, publisher, year, edition, pages
2016. Vol. 39, p. 69-76
National Category
Chemical Process Engineering
Research subject
Chemical Technology
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URN: urn:nbn:se:ltu:diva-3649DOI: 10.1016/j.jes.2015.11.007ISI: 000371515800010PubMedID: 26899646Scopus ID: 2-s2.0-84975686849Local ID: 17710f51-ae53-4111-8d07-1716c18064b6OAI: oai:DiVA.org:ltu-3649DiVA, id: diva2:976507
Note

Validerad; 2016; Nivå 2; 20151223 (andbra); Bibliografisk uppgift: 40th Anniversary of RCEES

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2019-08-23Bibliographically approved

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