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Degradation of tetracycline in water by gas-liquid plasma in conjunction with rGO-TiO_2 nanocomposite

刘行浩  程诚  许子牧  胡淑恒  沈洁  兰彦  朱剑豪  
【摘要】:Tetracycline(TC) is an antibiotic mainly used in livestock production and respiratory infection.Traditional methods are not effective in removing TC from solution. In this study, TC was degraded by gas–liquid plasma in the presence of rGO-TiO_2 in solution. The rGO-TiO_2 was prepared by modified hummers and hydrothermal method. The electrical and optical properties of the gas–liquid discharge plasma were studied and the produced long-lived reactive species were analyzed by spectrophotometer. The degradation efficiency of TC was improved by 41.4%after plasma treatment for 12 min in presence of 30 mg l-1 r GO-TiO_2 compared to that with plasma alone. The degradation efficiency increased with increasing discharge power, but as the initial concentration was increased from 20 to 80 mg l-1, the degradation efficiency of TC decreased. The initial p H had no significant effect on the degradation of TC. The intermediate products were determined by UV–vis spectrophotometry and ESI(+)–MS, and the degradation mechanism was analyzed. The reactive species, including O_3, ·OH, and H_2 O_2, etc., produced in the plasma/catalyst system attracted electron-rich functional groups(amino group, aromatic ring, and double bond). Therefore, the gas–liquid plasma/catalyst system could be an effective and promising method for pharmaceutical wastewater treatment in future.

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