摘要
以对羟基苯甲酸乙酯(EP)为目标污染物,考察了US/nZVI/H_2O_2系统中有机物污染物的降解特性。以US(超声波)、H_2O_2、nZVI(纳米零价铁)分别或联合对EP进行试验,使用控制变量法,检测不同操作参数和不同的H_2O_2、nZVI的量对EP降解的影响。结果表明,US/nZVI/H_2O_2联合系统对EP的降解存在协同作用,说明在US/nZVI/H_2O_2体系中,同时存在超声波的空化作用和nZVI的还原作用,nZVI和H_2O_2的存在大大提高了体系中羟基自由基的生成效率。
Ethyl p-hydroxybenzoate(EP) was used as the target contaminant, and its degradation was analyzed by US/nZVI/H_2O_2 system. The effect of different operating parameters and different amounts of H_2O_2, nZVI on the degradation of EP was examined by a control variable method. US(ultrasonic), H_2O_2, and nZVI(nano-zero-valent iron) were tested on EP alone and in combination. The results showed that the US/nZVI/H_2O_2 combined system had a synergistic effect on the degradation of EP, indicated that in the US/nZVI/H_2O_2 system, there were ultrasonic cavitation and nZVI reduction simultaneously. The presence of nZVI and H_2O_2 greatly increased the efficiency of hydroxyl radical generation in this system. The possible degradation pathways of EP were analyzed on the basis of data comparisons and previous reports.
引文
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