Abstract

Oxytetracycline hydrochloride is the most widely used veterinary antibiotic in aquaculture. The presence of large amounts of residual antibiotics in aquaculture wastewater harms the ecological environment. In this study, the ternary composite of Zn_0.75Mn_0.75Fe_1.5O₄/ZnFe₂O₄/ZnO (ZMF-ZF-Z) photocatalyst was prepared by the coprecipitation method for degradation of oxytetracycline hydrochloride in marine aquaculture wastewater. The crystal phase, structure, morphology, elemental composition, element content, and optical properties of photogenerated electron-hole pairs of catalyst were characterized by XRD, SEM, EDS, UV-VIS (DRS), PL spectroscopy, and other test methods. The results showed that ZMF-ZF-Z photocatalyst had a larger response range of visible light than pure ZnO, which can absorb more natural light. During the process of the experiment, the photocatalytic effect of Z ZMF-ZF-Z photocatalyst was almost no weakening after 5 times reuse, which means quite good stability of the photocatalyst. Under the visible light irradiation, the degradation rate of oxytetracycline hydrochloride in seawater was 77.11% with ZMF-ZF-Z photocatalyst, which was about 3 times higher than that of pure ZnO, and the photocatalytic activity was significantly improved. This research provides a scientific and effective method for degrading antibiotics in seawater in actual production and life.

摘要

盐酸土霉素是水产养殖中使用最广泛的兽用抗生素。水产养殖废水中存在大量残留抗生素危害生态环境。本研究采用Zn _0.75 Mn _0.75 Fe _1.5 O ₄ /ZnFe ₂ O _{4三元复合材料}采用共沉淀法制备降解海水养殖废水中盐酸土霉素的/ZnO（ZMF-ZF-Z）光催化剂。采用XRD、SEM、EDS、UV-VIS(DRS)、PL光谱等测试方法对光生电子-空穴对催化剂的晶相、结构、形貌、元素组成、元素含量和光学性质进行表征。结果表明，ZMF-ZF-Z光催化剂比纯ZnO对可见光的响应范围更大，可以吸收更多的自然光。在实验过程中，Z ZMF-ZF-Z光催化剂的光催化效果在重复使用5次后几乎没有减弱，说明该光催化剂具有相当好的稳定性。在可见光照射下，盐酸土霉素在海水中的降解率为77。用ZMF-ZF-Z光催化剂提高了11%，比纯ZnO高约3倍，光催化活性显着提高。该研究为在实际生产生活中降解海水中的抗生素提供了一种科学有效的方法。