Sonophotocatalytic Destruction of Chloroform: Comparison of Processes and Synergistic Effects
Sonophotocatalytic Destruction of Chloroform: Comparison of Processes and Synergistic Effects
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声光催化破坏氯仿：过程比较和协同效应
DOI：
10.1143/jjap.50.07he10
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发表时间：
2011
影响因子：
1.5
通讯作者：
J. Khim
中科院分区：
文献类型：
--
作者：
Beomguk Park;Eunju Cho;Hee;J. Khim
这项研究比较了超声波、紫外线和催化剂过程，并评估了它们各自的协同效应。本研究中的超声波频率使用 35、283、450 和 935 kHz，而使用短波长紫外线灯 (UVC)。 TiO2的剂量为0.3g/L。声光分解过程的降解速率常数为(4.2–8.7)×10-3 min-1，与声光分解过程几乎相同。协同效应值为1.07。该过程的主要机制是超声热解。紫外线提供了另一种机制，即利用羟基自由基的氧化作用，但增强作用并不显着。声光催化过程的速率常数为(48.1–64.6)×10-3 min-1。协同效应计算值为1.54。在此过程中，降解的主要机制是TiO2表面羟基自由基的氧化。超声波的作用是分散催化剂和将污染物传质到催化剂表面。
This study compared ultrasound, ultraviolet, and catalyst processes and evaluated their respective synergistic effects. The ultrasonic frequencies in this study used 35, 283, 450, and 935 kHz, whereas short wavelength ultraviolet lamp (UVC) was used. The dose of TiO2 was 0.3 g/L. The degradation rate constants for the sonophotolytic processes were (4.2–8.7)×10-3 min-1, nearly the same for the sonolytic processes. The value of the synergistic effect was 1.07. The main mechanism of this process was pyrolysis by ultrasound. The ultraviolet provided another mechanism as using oxidation by hydroxyl radicals, but the enhancement was not significant. The rate constants of sonophotocatalytic processes were (48.1–64.6)×10-3 min-1. The calculated value of synergistic effect was 1.54. In this process, the main mechanism for degradation was oxidation by hydroxyl radicals on the surface of TiO2. The roles of the ultrasound were the dispersion of catalyst and mass transport of pollutant to the surface of the catalyst.