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为解决传统工艺难以有效去除水中有机微污染物的问题,采用紫外激活过硫酸盐技术(UV/PS联用工艺)降解水中残留的金霉素(chlortetracycline,CTC),对比UV/PS联用工艺与单独UV工艺、单独PS工艺对金霉素的去除效果,考察底物初始浓度、氧化剂投加量、p H对金霉素降解的影响,鉴定反应系统中的活性自由基并求出其反应速率.结果表明:单独UV工艺、单独PS工艺和UV/PS联用工艺对金霉素的降解均符合表观一级反应动力学模型,并且UV工艺与PS工艺联用可以大大提高金霉素的去除率;较低的底物初始浓度和较高的氧化剂投加量可以提高金霉素的降解速率;p H对表观速率常数有一定影响,kobs在p H为3和7处分别达到最大值和最小值;UV/PS系统中参与氧化金霉素的主要活性自由基为SO4-·,其与金霉素的反应速率为8.8×108L·mol-1·s-1.
In order to solve the problem that traditional process is difficult to effectively remove organic micro-pollutants in water, ultraviolet (UV) / persulfate (UV / PS) technology was used to degrade the residual chlortetracycline (CTC) And single UV process, separate PS process on the removal of chlortetracycline, the initial concentration of the substrate, oxidant dosage, p H on the degradation of chlortetracycline, to identify the active system of the reaction system and to find the reaction The results showed that the degradation of chlortetracycline by UV alone, PS alone and UV / PS was in accordance with the apparent first-order reaction kinetics model, and the combination of UV and PS could greatly enhance chlortetracycline Lower substrate initial concentration and higher dosage of oxidant can increase the degradation rate of chlortetracycline; p H has some effect on the apparent rate constant, kobs reach respectively at p H of 3 and 7 Maximum and minimum values. The main active free radical involved in the oxidation of chlortetracycline in UV / PS system was SO4- ·, and its reaction rate with chlortetracycline was 8.8 × 108 L · mol-1 · s-1.