超声波对甲基橙的降解性能研究

超声波对甲基橙的降解性能研究

摘要： 超声是一种处理有机污染物废水的新型技术,近10年来,超声降解水体中有机污染物的研究十分活跃,但由于此技术存在着费用高、降解效率低等一些局限性,而更有效的方法是将超卢技术与其他水处理技术联合使用.该研究是选用甲基橙作为降解对象,以自制的纳米TiO2为催化剂,采用超声波氧化法,研究了超声时间、pH、初始浓度、不同浓度、催化剂种类,联合H2O2、TiO2等因素对甲基橙超卢波降解率的影响可行性研究.结果表明,超声时间延长,降解率增加,超卢100 min后降解率达13.6%,溶液初始浓度由4 mg/L增加到10 mg/L,降解率由6.3%上升到13.6%,在酸性条件下有利于甲基橙的降解,加入H2O2(30%)的量为3mL即可明显提高甲基橙的降解率.超声波-光催化氧化处理含甲基橙废水时,能使降解效率大大提高,而且要大于两者之间的简单相加,说明超声波和光催化之间存在协同作用. Abstract： Ultrasound is a new technique to eliminate organic pollutants in water. In the last ten years, the study on the degradation of pollutants in water by ultrasound was very active. However, due to some limitations of this technique, such as high power and low efficiency in degradation, more effective ways were applying ultrasound in combination with other waste treatment techniques. The study selected the methyl orange as the degrading target, applied nano-scale TiO2 as the catalyst and adopted the ultrasonic wave oxidization method, to have a feasibility research on the degrading rate of ultrasonic wave on methyl orange, on the impact of H2O2, TiO2, and the above factors, etc. The result indicated, the longer the ultrasonic time, the larger the degrading rate. The degrading rote was up to 13.6 % after ultrasonic for 100 min. The initial density of solution rose from 4 mg/L to 10 rag/L, and the degrading rate from 6.3 % to 13.6 %. Acidic conditions are favorable to the degradation of the methyl orange. Add 3 mL of H2O2 (30 %) could significantly improve the degradation rate. When combining ultrasound with photocatalytic oxidization to deal with the waste water, the degradation efficiency was significantly improved. Moreover, it was greater than simple addition of these two. This proved that functional coordination existed between ultrasound and photocatalysis. 作 者： 顾微    黄洁    Gu Wei    Huang Jie   作者单位： 韶关市环境监测中心站,广东,韶关,512026  期 刊： 广东化工    Journal： GUANGDONG CHEMICAL INDUSTRY  年，卷(期)： 2009, 36(7)  分类号： X5  关键词： 超声波    TiO2    甲基橙    Keywords： ultrasound    TiO2    methyl orange   

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