Green synthesis of red mud based ZnOFe2O3 composite used for photo-Fenton reaction under visible light
In this work, using solid waste red mud (RM) as main raw material and without addition of chemical reagents of alkali and ferric salt, a new method of flocculation-calcination was introduced as a green and facile process to produce RM based ZnOFe2O3 composite (RM-C) which can be used as a catalyst f...
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Published in | Journal of cleaner production Vol. 207; pp. 717 - 727 |
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Main Authors | , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
10.01.2019
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Subjects | |
Online Access | Get full text |
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Summary: | In this work, using solid waste red mud (RM) as main raw material and without addition of chemical reagents of alkali and ferric salt, a new method of flocculation-calcination was introduced as a green and facile process to produce RM based ZnOFe2O3 composite (RM-C) which can be used as a catalyst for photo-Fenton reaction under visible light. The prepared catalyst was characterized by SEM, EDS, XRD, BET, UV–Vis DRS and XPS. The characterization results showed the iron phase in RM-C was mainly α-Fe2O3, and ZnO formed in RM-C was amorphous and highly dispersed. RM-C showed a good response to the visible light, and the order of absorbance in 373–542 nm was RM-C > RM > ZnO. RM-C had an excellent long-term stability in the photo-Fenton process. The possible mechanisms in photo-Fenton system catalyzed by RM-C under visible light were presented. Using RM-C as catalyst, the toxicity of Orange II was greatly weakened by the photon-Fenton system under visible light. The method of flocculation-calcination was a green and feasible process for the preparation of RM-C, and the prepared RM-C was an effective composite catalyst for the photon-Fenton reaction under visible light.
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•Synthesis of red mud based composite by flocculation-calcination is proposed.•The flocculation-calcination is a green and feasible process.•Red mud based ZnOFe2O3 composite is successfully prepared by this method.•The composite is a good catalyst for photon-Fenton reaction under visible light.•The toxicity of Orange II is greatly weakened by using the composite. |
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ISSN: | 0959-6526 1879-1786 |
DOI: | 10.1016/j.jclepro.2018.10.051 |