Hu Yang, Wang Guan, Huang Mingzhi, Lin Kairong, Yi Yuqiang, Fang Zhanqiang, Li Pengjun, Wang Kangming
a Department of Water Resource and Environment , Sun Yat-Sen University , Guang Zhou 510275, China.
c School of Chemistry and Environment , South China Normal University , Guangzhou 51006,Guangdong, China.
Environ Technol. 2017 Aug 31:1-22. doi: 10.1080/09593330.2017.1374470.
Metronidazole (MNZ), one of the most commonly used nitroimidazole antibiotics in the world, poses a serious threat to human life and health. In this study, an enhanced sono-Fenton process for the degradation of MNZ is presented. The catalytic capacity of nano-FeO in systems comprising ultrasound + FeO + HO, and the influential parameters such as HO, nano-FeO doses and pH for the Sono-Fenton process, was investigated. The results showed that the nano-FeO particles appeared to be roughly spherical in shape, with an average size of 10-20 nm. It was found that •OH radicals were rapidly generated due to the catalytic activity of the nano-FeO. MNZ could be degraded within a wide pH range, from 3 to 9, and the degradation efficiencies were considerably enhanced by ultrasound. When the MNZ concentration was fixed at 20 mg/L, the nano-FeO dosage at 500 mg/L, the pH at 3 and the reaction temperature at 30°C, the removal efficiencies of MNZ were above 98% after 5 h. It is indicated that FeO magnetic nanoparticles were synthesized as heterogeneous catalysts to effectively degrade MNZ, and the observed stability and recyclability demonstrated that nano-FeO was promising for the treatment of wastewater contaminated with antibiotics.
甲硝唑（MNZ）是世界上最常用的硝基咪唑类抗生素之一，对人类生命健康构成严重威胁。本研究提出了一种强化的超声芬顿法用于降解MNZ。研究了在超声+FeO+HO体系中纳米FeO的催化能力，以及超声芬顿法中HO、纳米FeO剂量和pH等影响参数。结果表明，纳米FeO颗粒呈大致球形，平均粒径为10-20nm。发现由于纳米FeO的催化活性，能快速产生•OH自由基。MNZ在3至9的宽pH范围内均可降解，超声可显著提高降解效率。当MNZ浓度固定为20mg/L、纳米FeO剂量为500mg/L、pH为3且反应温度为30°C时，5小时后MNZ的去除率高于98%。结果表明，合成的FeO磁性纳米颗粒作为非均相催化剂可有效降解MNZ，观察到的稳定性和可回收性表明纳米FeO在处理受抗生素污染的废水方面具有应用前景。
