A comprehensive performance evaluation of heterogeneous Bi2Fe4O9/peroxymonosulfate system for sulfamethoxazole degradation

In this study, a Bi2Fe4O9 catalyst with nanoplate morphology was fabricated using a facile hydrothermal method. It was used as a catalyst to activate peroxymonosulfate (PMS) for aqueous sulfamethoxazole (SMX) removal. A comprehensive performance evaluation of the Bi2Fe4O9/PMS system was conducted by...

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Main Authors: Oh, Wen-Da, Chang, Victor Wei-Chung, Lim, Teik-Thye
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2021
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Online Access:https://hdl.handle.net/10356/150789
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1507892021-06-02T03:22:38Z A comprehensive performance evaluation of heterogeneous Bi2Fe4O9/peroxymonosulfate system for sulfamethoxazole degradation Oh, Wen-Da Chang, Victor Wei-Chung Lim, Teik-Thye School of Civil and Environmental Engineering Nanyang Environment and Water Research Institute Engineering::Environmental engineering Peroxymonosulfate Bismuth Ferrite In this study, a Bi2Fe4O9 catalyst with nanoplate morphology was fabricated using a facile hydrothermal method. It was used as a catalyst to activate peroxymonosulfate (PMS) for aqueous sulfamethoxazole (SMX) removal. A comprehensive performance evaluation of the Bi2Fe4O9/PMS system was conducted by investigating the effects of pH, PMS dosage, catalyst loading, SMX concentration, temperature, and halides (Cl− and Br−) on the degradation of SMX. The Bi2Fe4O9/PMS system demonstrated a remarkable catalytic activity with >95% SMX removal within 30 min (conditions: pH 3.8, [Bi2Fe4O9] = 0.1 g L−1, [SMX]:[PMS] mol ratio =1:20). It was found that both Cl− and Br− can lead to the formation of PMS–induced reactive halide species (i.e. HClO, HBrO, and Br2) which can also react with SMX forming halogenated SMX byproducts. Based on the detected degradation byproducts, the major SMX degradation pathway in the Bi2Fe4O9/PMS system is proposed. The SMX degradation by Bi2Fe4O9/PMS system in the wastewater secondary effluent (SE) was also investigated. The results showed that SMX degradation rate in the SE was relatively slower than in the deionized water due to (i) reactive radical scavenging by water matrix species found in SE (e.g.: dissolved organic matters (DOCs), etc.), and (ii) partial deactivation of the catalyst by DOCs. Nevertheless, the selectivity of the SO4•− towards SMX degradation was evidenced from the rapid SMX degradation despite the high background DOCs in the SE. At least four times the dosage of PMS is required for SMX degradation in the SE to achieve a similar SMX removal efficiency to that of the deionized water matrix. 2021-06-02T03:22:38Z 2021-06-02T03:22:38Z 2019 Journal Article Oh, W., Chang, V. W. & Lim, T. (2019). A comprehensive performance evaluation of heterogeneous Bi2Fe4O9/peroxymonosulfate system for sulfamethoxazole degradation. Environmental Science and Pollution Research, 26(2), 1026-1035. https://dx.doi.org/10.1007/s11356-017-8476-9 0944-1344 https://hdl.handle.net/10356/150789 10.1007/s11356-017-8476-9 28130722 2-s2.0-85010754871 2 26 1026 1035 en Environmental Science and Pollution Research © 2017 Springer-Verlag Berlin Heidelberg. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Environmental engineering
Peroxymonosulfate
Bismuth Ferrite
spellingShingle Engineering::Environmental engineering
Peroxymonosulfate
Bismuth Ferrite
Oh, Wen-Da
Chang, Victor Wei-Chung
Lim, Teik-Thye
A comprehensive performance evaluation of heterogeneous Bi2Fe4O9/peroxymonosulfate system for sulfamethoxazole degradation
description In this study, a Bi2Fe4O9 catalyst with nanoplate morphology was fabricated using a facile hydrothermal method. It was used as a catalyst to activate peroxymonosulfate (PMS) for aqueous sulfamethoxazole (SMX) removal. A comprehensive performance evaluation of the Bi2Fe4O9/PMS system was conducted by investigating the effects of pH, PMS dosage, catalyst loading, SMX concentration, temperature, and halides (Cl− and Br−) on the degradation of SMX. The Bi2Fe4O9/PMS system demonstrated a remarkable catalytic activity with >95% SMX removal within 30 min (conditions: pH 3.8, [Bi2Fe4O9] = 0.1 g L−1, [SMX]:[PMS] mol ratio =1:20). It was found that both Cl− and Br− can lead to the formation of PMS–induced reactive halide species (i.e. HClO, HBrO, and Br2) which can also react with SMX forming halogenated SMX byproducts. Based on the detected degradation byproducts, the major SMX degradation pathway in the Bi2Fe4O9/PMS system is proposed. The SMX degradation by Bi2Fe4O9/PMS system in the wastewater secondary effluent (SE) was also investigated. The results showed that SMX degradation rate in the SE was relatively slower than in the deionized water due to (i) reactive radical scavenging by water matrix species found in SE (e.g.: dissolved organic matters (DOCs), etc.), and (ii) partial deactivation of the catalyst by DOCs. Nevertheless, the selectivity of the SO4•− towards SMX degradation was evidenced from the rapid SMX degradation despite the high background DOCs in the SE. At least four times the dosage of PMS is required for SMX degradation in the SE to achieve a similar SMX removal efficiency to that of the deionized water matrix.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Oh, Wen-Da
Chang, Victor Wei-Chung
Lim, Teik-Thye
format Article
author Oh, Wen-Da
Chang, Victor Wei-Chung
Lim, Teik-Thye
author_sort Oh, Wen-Da
title A comprehensive performance evaluation of heterogeneous Bi2Fe4O9/peroxymonosulfate system for sulfamethoxazole degradation
title_short A comprehensive performance evaluation of heterogeneous Bi2Fe4O9/peroxymonosulfate system for sulfamethoxazole degradation
title_full A comprehensive performance evaluation of heterogeneous Bi2Fe4O9/peroxymonosulfate system for sulfamethoxazole degradation
title_fullStr A comprehensive performance evaluation of heterogeneous Bi2Fe4O9/peroxymonosulfate system for sulfamethoxazole degradation
title_full_unstemmed A comprehensive performance evaluation of heterogeneous Bi2Fe4O9/peroxymonosulfate system for sulfamethoxazole degradation
title_sort comprehensive performance evaluation of heterogeneous bi2fe4o9/peroxymonosulfate system for sulfamethoxazole degradation
publishDate 2021
url https://hdl.handle.net/10356/150789
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