| 康晓跃,周进文,李赵芮,李彦盼,鄢顺意,舒小华,张倩.黄铁矿光降解泰乐菌素及干扰因素影响机制[J].农业环境科学学报,2022,41(3):606-615. |
| 黄铁矿光降解泰乐菌素及干扰因素影响机制 |
| Mechanism study on the photodegradation of tylosin by pyrite and the influence of interference factors |
| 投稿时间：2021-08-02 |
| DOI：10.11654/jaes.2021-0869 |
| 中文关键词: 黄铁矿(FeS2) 光催化 N/P影响 pH影响 抗生素 泰乐菌素(TYL) |
| 英文关键词: pyrite(FeS2) photodegradation effect of N/P effect of pH antibiotic tylosin |
| 基金项目:国家自然科学基金项目(41807392,41967042);国家大学生创新创业训练计划项目(201810595005,202010595150) |
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| 中文摘要: |
| 为探讨不同环境条件对黄铁矿（FeS2）光催化降解抗生素的影响，推进FeS2光催化的实际应用，实验研究了pH值、水中NO3-和H2PO4-对FeS2光降解泰乐菌素（Tylosin，TYL）的影响机制，考察了FeS2重复利用的光催化效果并深入分析了FeS2光降解过程中的自由基贡献。结果表明：天然FeS2能够在1 h内快速光降解TYL（降解率为97%）。FeS2光催化过程中产生·OH、·O2-及h+，对TYL的光降解起主要作用的是·OH和·O2-。FeS2使水溶液pH维持在酸性条件，导致初始溶液pH对FeS2光降解TYL影响较小。水环境中NO3-可以吸收光能产生·OH，促进TYL的光降解。不同浓度H2PO-4对溶液pH的影响及Fe3+水解胶体的絮凝作用导致不同浓度H2PO4-对FeS2光降解TYL产生不同影响。FeS2重复利用4次后，仍能够保持80%的光降解效率。研究表明，利用FeS2去除抗生素具有实际应用价值，FeS2的光催化效果与污水的pH值、NO3-和H2PO4-浓度密切相关。 |
| 英文摘要: |
| To investigate the effect of different environmental conditions on the photocatalytic activity of pyrite(FeS2) for antibiotics and promote the photocatalytic application of FeS2, an experiment was designed to study the effects of pH, NO3-, and H2PO4- in water on the photodegradation of tylosin(TYL) by FeS2. The photocatalytic effect of FeS2 reuse was investigated, and the free radical contribution in the FeS2 photodegradation process was analyzed. Results showed that natural FeS2 could rapidly photodegrade TYL within 1 h(the degradation rate was 97%). Additionally,·OH,·O2- and h+ radicals were produced in the photocatalytic process of FeS2. The photodegradation of TYL was mainly affected by·OH and·O2-. FeS2 maintained the pH of the aqueous solution under acidic conditions, resulting in the initial solution pH having little effect on the photodegradation of TYL by pyrite. NO3- in a water environment could absorb light energy to produce·OH and promote the photodegradation of TYL. The effect of different concentrations of H2PO4- on solution pH and flocculation of Fe3+ hydrolytic colloids resulted in different effects on the photodegradation of TYL by FeS2. After FeS2 was reused four times, it maintained 80% photodegradation efficiency. Results indicate that FeS2 has potential for practical application in antibiotic photodegradation. Photodegradation efficiency is related to the pH value and concentration of NO3- and H2PO4- in wastewater. |
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