超声波与光协同降解对氯苯酚水溶液的机理研究
Synergistic effects on degradation of parachlorophenol solution by combination of ultrasound and light irradiations
-
摘要: 为阐明超声波与光协同作用机理,以对氯苯酚为研究对象,研究了对氯苯酚水溶液在超声波与光(紫外光、可见光)单独及共同辐照下的降解现象,研究发现对氯苯酚水溶液在超声波及紫外光单独辐照下均发生降解,降解过程符合一级反应动力学规律。在超声波和紫外光共同辐照下,降解过程也符合一级反应动力学规律,同时对氯苯酚水溶液降解呈现显著的声光协同效应,即同一辐照时间内超声波和紫外光共同辐照下对氯苯酚的降解率大于超声波和紫外光单独辐照下各自降解率之和。另一方面,超声波和可见光共同辐照没有呈现出明显的声光协同效应。超声波和紫外光共同辐照下的声光协同效应被归因于紫外光对超声空化过程中产生的过氧化氢的裂解作用。Abstract: The degradation of papachlorophenol has been investigated under the irradiation of ultrasound and light (visible or ultraviolet light) respectively and simultaneously.We observed that parachlorophenol was degraded under the irradiation of ultrasound and ultraviolet light.The reaction follows the first-order kinetics.Under the simultaneous irradiation of ultrasound and ultraviolet light,the reaction amount is greater than the sum of that under respective irradiations of ultrasound and ultraviolet light,indicating a synergistic effect of ultrasound and ultraviolet light irradiations. On the other hand,synergistic effect was not observed when papachloraphenol was irradiated under the simultaneous irradiation of ultrasound and visible light.The synergistic effect of ultrasound and ultraviolet light is ascribed to the ultraviolet light's decomposition of hydrogen peroxide generated by ultrasound irradiation.
下载: