Zhao Guohua, Gao Junxia, Shi Wei, Liu Meichuan, Li Dongming
Department of Chemistry, Tongji University, Shanghai, China.
Chemosphere. 2009 Sep;77(2):188-93. doi: 10.1016/j.chemosphere.2009.07.044. Epub 2009 Aug 15.
In this study, an in situ microwave activated platinum electrode was developed for the first time to completely incinerate the azo dye simulated wastewater containing methyl orange. The experiments were carried out in a circulating system under atmospheric pressure. Azo bond of methyl orange was partly broken on Pt, certain decoloration was reached, and the total organic carbon was not removed effectively without microwave activation. However, methyl orange was mineralized completely and efficiently on the in situ microwave activated Pt. 2,5-Dinitrophenol, p-nitrophenol, hydroquinone, benzoquinone, maleic and oxalic acids are the main intermediates during degradation of methyl orange. Aromatic products are the main substances leading to the poisoning of Pt and decrease of electrochemical oxidation efficiency, so methyl orange removal can not be carried out thoroughly. However, the intermediates were broke down quickly with in situ microwave activation promoting the mineralization of methyl orange on Pt.
在本研究中，首次开发了一种原位微波活化铂电极，用于完全焚烧含甲基橙的偶氮染料模拟废水。实验在常压下的循环系统中进行。甲基橙的偶氮键在铂上部分断裂，达到了一定的脱色效果，在没有微波活化的情况下总有机碳没有被有效去除。然而，甲基橙在原位微波活化的铂上被完全且高效地矿化。2,5-二硝基苯酚、对硝基苯酚、对苯二酚、苯醌、马来酸和草酸是甲基橙降解过程中的主要中间体。芳香族产物是导致铂中毒和电化学氧化效率降低的主要物质，因此甲基橙的去除不能彻底进行。然而，通过原位微波活化，中间体迅速分解，促进了甲基橙在铂上的矿化。
