期刊
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
卷 10, 期 3, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2022.107765
关键词
Magnetite; Copper; Clay; Photo-Fenton degradation; Matrix effect; Antibiotics
资金
- Sao Paulo Research Foundation, Brazil [2018/12780-4, 2019/22218-4]
- Coordination for the Improvement of Higher Education Personnel, Brazil (CAPES)
- Water Joint Programming Initiative (JPI) through the IDOUM research project (Innovative Decentralized and Low Cost Treatment Systems for Optimal Urban Wastewater Management)
The use of natural clay as a support for magnetite and copper-containing magnetite was evaluated for heterogeneous Fenton/photo-Fenton degradation of trimethoprim and sulfamethoxazole. The study showed that complete degradation of the antibiotics can be achieved under solar irradiation using the clay material, which also maintained efficiency during reuse cycles, making it a potential low-cost catalyst.
The use of natural clay as a support for magnetite and copper-containing magnetite was evaluated for heterogeneous Fenton/photo-Fenton degradation of trimethoprim and sulfamethoxazole. In Fenton experiments, the incorporation of copper ions on magnetite played an important role in the decomposition of hydrogen peroxide. Photo-Fenton experiments were performed under solar and UV-LED (370 nm) irradiation, with complete degradation of both antibiotics in purified water achieved under solar irradiation. Evaluation of the effects of inorganic anions and organic carbon showed that the highest center dot OH scavenging was due to CO3 2-/HCO3 - and organic matter content. From a practical perspective, treatment of wastewater treatment plant effluent under solar irradiation resulted in 52% and 41% degradation of TMP and SMZ, respectively, together with 15% removal of dissolved organic carbon. The material maintained efficiency during 3 reuse cycles, showing its potential for use as a low-cost catalyst. The intermediates identified by UHPLC/MS indicated that TMP degradation involved hydroxylation, demethylation/hydroxylation, and cleavage pathways, while SMZ degradation involved hydroxylation, breaking of the sulfonamide bond, and opening of the isoxazole ring.
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