Peroxymonosulfate activation by a metal-free biochar for sulfonamide antibiotic removal in water and associated bacterial community composition

[Display omitted] •Coconut-shell-derived biochar activated peroxymonosulfate for pollutant degradation.•Biochar activation of peroxymonosulfate efficiently removed sulfamethoxazole from water.•Radical (SO4•−/HO•) and nonradical (1O2) contributed to sulfamethoxazole degradation.•High chloride concent...

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Bibliographic Details
Published in:Bioresource technology 2022-01, Vol.343, p.126082-126082, Article 126082
Main Authors: Hung, Chang-Mao, Chen, Chiu-Wen, Huang, Chin-Pao, Shiung Lam, Su, Dong, Cheng-Di
Format: Article
Language:English
Subjects:
Antibiotic degradation
Bacterial community
Coconut-shell-derived biochar (CSBC)
Peroxymonosulfate activation
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Summary:[Display omitted] •Coconut-shell-derived biochar activated peroxymonosulfate for pollutant degradation.•Biochar activation of peroxymonosulfate efficiently removed sulfamethoxazole from water.•Radical (SO4•−/HO•) and nonradical (1O2) contributed to sulfamethoxazole degradation.•High chloride concentration enhanced sulfamethoxazole degradation.•Sulfamethoxazole degradation affected the bacterial community composition. Antibiotic sulfamethoxazole (SMX) has been commonly found in various water matrices, therefore effective decontamination method is urgently needed. Metal-free pristine coconut-shell-derived biochar (CSBC), synthesized by thermochemical conversion at 700 °C, was used for activating peroxymonosulfate (PMS), an oxidant, to degrade SMX, a sulfonamide antibiotic, in water. SMX degradation, maximized at 0.05 mM concentration, was 85% in 30 min at pH 5.0 in the presence of 150 mg L−1 of CSBC. Remarkably, SMX removal reached 99% in a chloride-rich CSBC/PMS system. SMX degradation was mainly attributed to the role of CSBC in enhancing PMS activation to produce combined radical (SO4•−/HO•) and nonradical (1O2) reaction pathways. The most abundant genus in the CSBC/PMS system was Methylotenera, which belonged to the Proteobacteria phylum. Thus, from a perspective of biowaste-to-resource recycling and circular bioeconomy view point, CSBC is a potential catalytic activator of PMS for the removal of sulfonamide antibiotics from aqueous environments.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2021.126082