铁(III)-草酸盐配合物光降解四环素工艺优化研究
首发时间:2011-03-25
摘要:以四环素(TC)为研究对象,探讨铁-草酸盐配合物在模拟太阳光下光降解水溶液中四环素的过程以及反应最优条件。采用Design Expert 试验设计软件的中心组合设计方法进行响应曲面优化设计,考察四环素浓度(0-90 μM)、pH值(3.0-7.0)、Fe(III)浓度(0-40 μM)、草酸盐浓度(0-400 μM)对四环素降解的影响。结果表明,随着TC浓度的增加,反应速率常数k显著降低;增加Fe(III)或者Oxalate的浓度,都能不同程度的促进反应的速率;铁和草酸钠同时存在比单纯铁存在的情况下降解效率高,这说明Fe(III)-Oxa配合物的光化学活性要高于Fe(III)-OH;中性条件下(pH=7.0)反应的最优条件:[TC]0 = 10 μM,[Fe(III)]0/[cit]0 = 40/400 μM.
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Process Optimization on Photodegradation of Tetracycline by Fe(III)-oxalate complex in aqueous solution
Abstract:The multivariate photodegradation kinetics of tetracycline (TC) in the Fe(III)-oxalate complex system under simulated sunlight was investigated. The Design Expert software was used for the experimental design and the central composite design was employed to explore the effects of the initial concentrations of TC (0-90 μM), pH (3.0-7.0), Fe(III) (0-40 μM), and oxalate (0-400 μM) on the photodegradation of TC in aqueous solution. The results show that the rate constants of photodegradation decreased markedly with increasing initial concentration of TC. The rate constants of degradation improved as increasing the concentrations of Fe(III) and citrate simultaneously or separately. The degradation effective of Fe(III)-oxalate species were higher than Fe(III), indicating the photoreactive of Fe(III)-oxalate complexes is higher than Fe(III)-OH. The optimal photodegradation condition at pH 7.0 was achieved when [Fe(III)]0/[oxalate]0 = 40/400 μM and the [TC]0 = 10 μM.
Keywords: Tetracycline Photodegradation Fe(III)-oxalate complex Central composite design
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