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Simultaneous Removal of Antibiotic Resistant Bacteria, Antibiotic Resistance Genes, and Micropollutants by a Modified Photo-Fenton Process

Water Research(2022)SCI 1区

Univ Queensland

Cited 77|Views27
Abstract
The co-occurrence of various chemical and biological contaminants of emerging concerns has hindered the application of water recycling. This study aims to develop a heterogeneous photo-Fenton treatment by fabricating nano pyrite (FeS2) on graphene oxide (FeS2@GO) to simultaneously remove antibiotic resistant bacteria (ARB), antibiotic resistance genes (ARGs), and micropollutants (MPs). A facile and solvothermal process was used to synthesize new pyrite-based composites. The GO coated layer forms a strong chemical bond with nano pyrite, which enables to prevent the oxidation and photocorrosion of pyrite and promote the transfer of charge carriers. Low reagent doses of FeS2@GO catalyst (0.25 mg/L) and H2O2 (1.0 mM) were found to be efficient for removing 6-log of ARB and 7-log of extracellular ARG (e-ARG) after 30 and 7.5 min treatment, respectively, in synthetic wastewater. Bacterial regrowth was not observed even after a two-day incubation. Moreover, four recalcitrant MPs (sulfamethoxazole, carbamazepine, diclofenac, and mecoprop at an environmentally relevant concentration of 10 mu g/L each) were completely removed after 10 min of treatment. The stable and recyclable composite generated more reactive species, including hydroxyl radicals (HO center dot), superoxide radicals (O-2(center dot-)), singlet oxygen (O-1(2)). These findings highlight that the synthesized FeS2@GO catalyst is a promising heterogeneous photo-Fenton catalyst for the removal of emerging contaminants.
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Antibiotic resistance (AR),Antibiotic resistance gene (ARG),Micropollutants (MPs),Modified photo-Fenton,Atomic force microscopy (AFM)
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要点】:研究开发了一种基于纳米黄铁矿(FeS2)与氧化石墨烯(FeS2@GO)的异相光芬顿处理技术,能够同时去除抗生素耐药细菌(ARB)、抗生素耐药基因(ARGs)和微污染物(MPs)。

方法】:通过简便的溶剂热过程合成新型黄铁矿基复合材料,氧化石墨烯层与纳米黄铁矿形成强化学键,增强电荷载体的转移。

实验】:在合成污水中,使用0.25 mg/L的FeS2@GO催化剂和1.0 mM的H2O2,30分钟后能去除6个数量级的ARB,7.5分钟后能去除7个数量级的胞外ARG(e-ARG),细菌在两天培养后无再生现象;在10分钟内能完全去除四种难降解微污染物(磺胺甲恶唑、卡马西平、双氯芬酸和麦草畏,每种浓度为10 μg/L)。该稳定且可循环利用的复合材料能产生更多活性物种,包括羟基自由基(HO·)、超氧自由基(O2·-)和单线态氧(O1(2))。