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Type: | Journal article |
Title: | Efficient removal of organic and bacterial pollutants by Ag-La₀.₈Ca₀.₂Fe₀.₉₄O₃-δ perovskite via catalytic peroxymonosulfate activation |
Other Titles: | Efficient removal of organic and bacterial pollutants by Ag-La(0.8)Ca(0.2)Fe(0.94)O(3-δ) perovskite via catalytic peroxymonosulfate activation |
Author: | Chu, Y. Tan, X. Shen, Z. Liu, P. Han, N. Kang, J. Duan, X. Wang, S. Liu, L. Liu, S. |
Citation: | Journal of Hazardous Materials, 2018; 356:53-60 |
Publisher: | Elsevier |
Issue Date: | 2018 |
ISSN: | 0304-3894 1873-3336 |
Statement of Responsibility: | Yuanyuan Chu, Xiaoyao Tan, Zhangfeng Shen, Pengyun Liu, Ning Han, Jian Kang, Xiaoguang Duan, Shaobin Wang, Lihong Liu, Shaomin Liu |
Abstract: | Removal of toxic organics and bacterial disinfection are important tasks in wastewater treatment. Most heavy metal-based catalysts for degradation of aqueous organic pollutants in heterogeneous Fenton-like processes suffer from the toxicity of leached metals. The present work reports environmentally benign systems for both degradation of organics and bacterial disinfection. Calcium substituted LaFeO(3-δ) perovskite was demonstrated as an efficient catalyst to activate peroxymonosulfate (PMS) for degradation of phenol, methylene blue and rhodamine 6 G. Compared to LaFeO(3-δ) and nanocrystal Fe(3)O(4), the lattice oxygen vacancies in B-site cation-deficient perovskite of La(0.8)Ca(0.2)Fe(0.94)O(3-δ) (LaCaFeO(3-δ)) particles renders this material a greatly improved catalytic performance. Electron paramagnetic resonance (EPR) suggested that both sulfate (SO(4)•–) and hydroxyl radicals (•OH) played critical roles in the advanced oxidation processes. Moreover, silver doped perovskite (Ag-LaCaFeO(3-δ))/PMS successfully inhibited the growth of waterborne pathogen Escherichia coli and Methicillin-resistant Staphylococcus aureus (MRSA) at a lower dose than silver ions, proving a synergetic effect between free radicals and Ag⁺ in killing the bacteria. Therefore, Ag-LaCaFeO(3-δ)/PMS would be promising for practical wastewater treatment. |
Keywords: | Cobalt-free perovskite catalyst; peroxymonosulfate oxidation; organic degradation; microbial disinfection |
Rights: | © 2018 Elsevier B.V. All rights reserved. |
DOI: | 10.1016/j.jhazmat.2018.05.044 |
Grant ID: | http://purl.org/au-research/grants/arc/DP150103026 http://purl.org/au-research/grants/arc/DP170104264 |
Published version: | http://dx.doi.org/10.1016/j.jhazmat.2018.05.044 |
Appears in Collections: | Chemical Engineering publications |
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