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目前,声光催化降解水中有机物已成为水处理领域一个热点课题。文章研究了声光催化过程中羟自由基的产生,探讨了二氧化钛的性质和浓度,初始 pH 值,亚铁离子的浓度和双氧水的浓度对羟自由基产生的影响。研究表明:当催化剂的团聚性较强时,超声的加入可以使自由基的产率提高1倍以上;催化剂的浓度和初始 pH 值越高,自由基产率越高:当 pH=12时,在30min 处羟自由基产率出现最大值;亚铁离子对羟自由基的产生有一定的促进作用,但双氧水的影响不明显。
At present, the acousto-photocatalytic degradation of water organic matter has become a hot topic in the field of water treatment. In this paper, the generation of hydroxyl radicals during the acousto-photocatalytic process was studied. The effects of the properties and concentrations of titanium dioxide, the initial pH value, the concentration of ferrous ions and the concentration of hydrogen peroxide on hydroxyl radicals were discussed. The results show that when the catalyst agglomeration is strong, the yield of free radicals can be increased more than two times by adding ultrasound; the higher the initial concentration and initial pH of the catalyst, the higher the yield of free radicals: when pH = 12, At 30 min, the hydroxyl radical yield reached the maximum value. Ferrous ion promoted the production of hydroxyl radicals, but the effect of hydrogen peroxide was not obvious.