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Fe(Ⅲ)-草酸盐配合物光降解四环素工艺优化研究

发表时间:2012-12-31  浏览量:1489  下载量:392
全部作者: 冯晓楠,王宗平,陈勇,陶涛
作者单位: 华中科技大学环境科学与工程学院
摘 要: 以四环素(tetracycline,TC)为研究对象,探讨Fe(Ⅲ)-草酸盐配合物在模拟太阳光下光降解水溶液中TC的过程以及反应最优条件。采用Design-Expert实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TC浓度(0~90 μmol/L)、pH值(3.0~7.0)、Fe(Ⅲ)浓度(0~40 μmol/L)、草酸盐(oxalate)浓度(0~400 μmol/L)对TC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)或者草酸盐的浓度,都能不同程度地提高反应的速率;Fe(Ⅲ)和草酸钠同时存在比单纯Fe(Ⅲ)存在的情况下降解效率高,这说明Fe(Ⅲ)-草酸盐配合物的光化学活性要高于Fe(Ⅲ)-OH;中性条件下(pH=7.0)反应的最优条件为[TC]0=10 μmol/L,[Fe(Ⅲ)]0/[oxalate]0=40/400 μmol/L.
关 键 词: 市政工程;四环素;光降解;Fe(Ⅲ)-草酸盐配合物;中心组合设计
Title: Process optimization on photodegradation of tetracycline by Fe(Ⅲ)-oxalate complex
Author: FENG Xiaonan, WANG Zongping, CHEN Yong, TAO Tao
Organization: School of Environmental Science and Engineering, Huazhong University of Science and Technology
Abstract: The process and optimization parameters on photodegradation of tetracycline (TC) in aqueous solution by Fe(Ⅲ)-oxalate complex system under simulated sunlight was investigated. The central composite design in the design-expert software was used for response surface optimization design. The effects of the initial concentrations of TC (0-90 μmol/L), pH (3.0-7.0), Fe(Ⅲ) (0-40 μmol/L), and oxalate (0-400 μmol/L) on the photodegradation of TC in aqueous solution were explored. The results showed that the rate constant k of photodegradation decreased markedly with increasing initial concentration of TC. The rate constants of degradation improved when the concentrations of Fe(Ⅲ) and oxalate increased simultaneously or separately. Furthermore, the degradation effective of Fe(Ⅲ)-oxalate species was higher than Fe(Ⅲ) alone, indicating the photoreactive of Fe(Ⅲ)-oxalate complexes was higher than Fe(Ⅲ)-OH. The optimal photodegradation condition at pH 7.0 was achieved when [Fe(Ⅲ)]0/[oxalate]0=40/400 μmol/L and the [TC]0=10 μmol/L.
Key words: municipal engineering; tetracycline; photodegradation; Fe(Ⅲ)-oxalate complex; central composite design
发表期数: 2012年12月第24期
引用格式: 冯晓楠,王宗平,陈勇,等. Fe(Ⅲ)-草酸盐配合物光降解四环素工艺优化研究[J]. 中国科技论文在线精品论文,2012,5(24):2376-2384.
 
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