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| Mechanisms of the effect of organic acids in non-aqueous systems on the degradation of fluoroquinolone antibiotics at the birnessite interface |
| Received:December 26, 2024 |
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| KeyWord:birnessite;organic acid;fluoroquinolone antibiotics(FQs);no-naqueous;photodegradation |
| Author Name | Affiliation | E-mail | | TIAN Qin | School of Chemistry and Materials Science, Guizhou Normal University, Guiyang 550001, China
National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangdong Key Laboratory of Integrated Agroenvironmental Pollution Control and Management, Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, China | | | LI Daiwei | School of Chemistry and Materials Science, Guizhou Normal University, Guiyang 550001, China | | | CHENG Pengfei | National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangdong Key Laboratory of Integrated Agroenvironmental Pollution Control and Management, Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, China
School of Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China | pengfeichemistry@163.com | | QIN Haoli | School of Chemistry and Materials Science, Guizhou Normal University, Guiyang 550001, China
The Key Laboratory of Materials Chemistry in Guizhou Province, Guiyang 550001, China | | | LIU Tongxu | National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangdong Key Laboratory of Integrated Agroenvironmental Pollution Control and Management, Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, China | |
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| Abstract: |
| To investigate the photodegradation mechanism of fluoroquinolone antibiotics（fluoroquinolones, FQs）in non-aqueous systems, the effects of soil-active mineral birnessite and organic acids secreted by plant roots were studied. Birnessite and oxalate-loaded birnessite were synthesized and subjected to photodegradation experiments of non-aqueous FQs under varying oxalate loadings and moisture conditions. The results showed that as the oxalate loading on birnessite increased, its oxidation degree decreased, with the surface oxygen vacancy/surface lattice oxygen（Oads/Oaltt）ratio rising from 0.215 to 0.272-0.394. The band gap of birnessite decreased from 1.80 eV to 1.62-1.64 eV. Photodegradation experiments demonstrated that norfloxacin underwent significant photodegradation in birnessite with different oxalate loadings. The degradation rate constant increased with the oxalate loading, from 0.042 min-1 to 0.152 min-1. Similarly, the degradation rate constant also increased with moisture content, from 0.029 min-1 to 0.109 min-1. Comparative studies of different FQs structures（norfloxacin, ciprofloxacin, enrofloxacin）showed distinct degradation rates, influenced by molecular activity, and the promoting effect of oxalate-loaded birnessite varied accordingly. The results suggest that oxalate loading reduces the oxidation degree of birnessite, enhances the photocatalytic effect, and facilitates the formation of more reactive species, thereby promoting the photodegradation of norfloxacin at the birnessite interface. |
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