Journal
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
Volume 111, Issue -, Pages 162-169Publisher
ELSEVIER
DOI: 10.1016/j.jtice.2020.04.005
Keywords
Hydroxyl Radical; LaFeO3; Reaction Kinetics; SR-visible light-Fenton; Sulfate Radical
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Funding
- Beijing Forestry University Outstanding Young Talent Cultivation Project [2019JQ03008]
- Beijing Natural Science Foundation [L182027]
- Fundamental Research Funds for the Central Universities [2015ZCQ-HJ-02]
- National Natural Science Foundation of China [51878047, 51578520, 51378063]
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In this work, a novel sulfate radical (SR)-visible light-Fenton mediated by LaFeO3 (LFO) under visible light was established and its performance on Rhodamine B (RhB) dye wastewater degradation was evaluated. Herein, peroxymonosulfate (PMS) was able to be activated by a synergic effect of visible light energy and LFO to form SR and hydroxyl radical (center dot OH). All RhB (initial concentration was 20 mg L-1) degradation was reached at 180 min under visible light irradiation in the presence of 3.552 mM PMS and 1.0 g L-1 LFO. All reactions followed the observed pseudo - first order reaction kinetics, including effects of [PMS], [catalyst], optical power density and initial solution pH. Based on the investigation of above parameters effects on RhB degradation in SR-photo-Fenton, a predictable and empirical mathematical kinetic model was proposed. Additionally, the reactive oxygen species (ROS) formed in this SR-visible light-Fenton were identified by quenching experiments, as that SO4 center dot and center dot OH dominated oxidation. At last, the reaction mechanism of this novel SR-visible light-Fenton was suggested based on the qualitative quantitative analysis of major intermediates of RhB and the identified ROS in SR-visible light-Fenton mediated by LFO. (C) 2020 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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