Issue 84, 2016, Issue in Progress

Heterogeneous UV-Fenton photodegradation of azocarmine B over [FeEDTA] intercalated ZnAl-LDH at circumneutral pH

Abstract

This work aimed at maintaining Fe(III) in soluble form at circumneutral pH and separating it from the treated effluent by using the heterogeneous catalyst of Fe(III)–ethylenediaminetetraacetate complex ([FeEDTA]) intercalated layered double hedroxides (LDHs) in the UV-Fenton process for the degradation of azocarmine B (ACB). All samples were fully characterized by various techniques and the results indicated the successful intercalation of [FeEDTA] within the interlayer of layered double hedroxides. In the decolorization and mineralization of the ACB process, the obtained catalyst showed a high photo-catalytic activity and an excellent stability at circumneutral pH. In addition, response surface methodology (RSM) was employed to optimize operating variables, and these mathematical models produced a satisfactory fit. The optimum conditions for ACB degradation were confirmed to be 6.54 initial pH, 100 mg L−1 ACB concentration and 11.5 mM H2O2 concentration. Under the optimum conditions, the maximum ACB decolorization efficiency and TOC removal could reach up to 97.27% and 90.36%, respectively, which closely agreed with the predicted values. Finally, the possible reaction mechanisms involved in the heterogeneous UV-Fenton system were proposed.

Graphical abstract: Heterogeneous UV-Fenton photodegradation of azocarmine B over [FeEDTA]− intercalated ZnAl-LDH at circumneutral pH

Article information

Article type
Paper
Submitted
06 Jun 2016
Accepted
18 Aug 2016
First published
19 Aug 2016

RSC Adv., 2016,6, 80501-80510

Heterogeneous UV-Fenton photodegradation of azocarmine B over [FeEDTA] intercalated ZnAl-LDH at circumneutral pH

X. Tang, Y. Liu and S. Li, RSC Adv., 2016, 6, 80501 DOI: 10.1039/C6RA14671F

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