超聲波對甲基橙的降解性能研究

摘要： 超聲是一種處理有機污染物廢水的新型技術(shù),近10年來,超聲降解水體中有機污染物的研究十分活躍,但由于此技術(shù)存在著費用高、降解效率低等一些局限性,而更有效的方法是將超盧技術(shù)與其他水處理技術(shù)聯(lián)合使用.該研究是選用甲基橙作為降解對象,以自制的納米TiO2為催化劑,采用超聲波氧化法,研究了超聲時間、pH、初始濃度、不同濃度、催化劑種類,聯(lián)合H2O2、TiO2等因素對甲基橙超盧波降解率的影響可行性研究.結(jié)果表明,超聲時間延長,降解率增加,超盧100 min后降解率達13.6%,溶液初始濃度由4 mg/L增加到10 mg/L,降解率由6.3%上升到13.6%,在酸性條件下有利于甲基橙的降解,加入H2O2(30%)的量為3mL即可明顯提高甲基橙的降解率.超聲波-光催化氧化處理含甲基橙廢水時,能使降解效率大大提高,而且要大于兩者之間的簡單相加,說明超聲波和光催化之間存在協(xié)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： 顧微    黃潔    Gu Wei    Huang Jie   作者單位： 韶關(guān)市環(huán)境監(jiān)測中心站,廣東,韶關(guān),512026  期 刊： 廣東化工    Journal： GUANGDONG CHEMICAL INDUSTRY  年，卷(期)： 2009, 36(7)  分類號： X5  關(guān)鍵詞： 超聲波    TiO2    甲基橙    Keywords： ultrasound    TiO2    methyl orange   

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