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首页> 外文期刊>Environmental Science and Pollution Research >Degradation of quinolone antibiotic, norfloxacin, in aqueous solution using gamma-ray irradiation
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Degradation of quinolone antibiotic, norfloxacin, in aqueous solution using gamma-ray irradiation

机译：γ射线辐照降解喹诺酮类抗生素诺氟沙星

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This study reports the efficiency of gamma-ray irradiation to degrade quinolone antibiotic, norfloxacin, in aqueous solution. Laboratory batch experiments were conducted to determine the "pseudo-first" order degradation kinetics of norfloxacin in the concentration ranges of 3.4-16.1 mg L-1 by gamma-ray irradiation. The dose constant was found to be dependent on the initial concentration of norfloxacin and gammaray irradiation dose rate (D-r). The saturation of norfloxacin sample solutions with N-2, air or N2O, and the presence of tertbutanol and 2-propanol showed that (OH)-O-center dot played more crucial role in the degradation of norfloxacin. The second order rate constants of (OH)-O-center dot, c(aq)(-), and H-center dot with norfloxacin were calculated to be 8.81 x 10(9), 9.54x10(8), and 1.10 x 10(9) M-1 s(-1), respectively. The effects of various additives including CO32-, HCO3-, NO3-, NO2-, and thiourea and the pH of the medium on the degradation of norfloxacin were also investigated. Norfloxacin degradation was lower in surface water and wastewater than in ultrapure water. Several degradation byproducts of norfloxacin were identified from which the possible degradation pathway was proposed.
机译：这项研究报告了伽马射线辐射降解水溶液中喹诺酮类抗生素诺氟沙星的效率。进行了实验室分批实验，以通过伽马射线辐照确定浓度范围为3.4-16.1 mg L-1的诺氟沙星的“伪一级”降解动力学。发现剂量常数取决于诺氟沙星的初始浓度和伽马射线辐照剂量率（D-r）。 N-2，空气或N2O对诺氟沙星样品溶液的饱和作用，以及叔丁醇和2-丙醇的存在表明，（OH）-O-中心点在诺氟沙星的降解中起着更为关键的作用。计算出（OH）-O-中心点，c（aq）（-）和H-中心点与诺氟沙星的二阶速率常数分别为8.81 x 10（9），9.54x10（8）和1.10 x 10（9）M-1 s（-1）。还研究了各种添加剂（包括CO32-，HCO3-，NO3-，NO2-和硫脲）以及培养基的pH对诺氟沙星降解的影响。与地表水和废水相比，诺氟沙星的降解率低于超纯水。确定了诺氟沙星的几种降解副产物，从中提出了可能的降解途径。

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