Abstract
The photocatalytic degradation of alizarin green (AG) was investigated in aqueous TiO2 suspensions under UV–vis irradiation by a microwave discharged electrodeless lamp (MDEL). The coupled TiO2 and MDEL led to rapid and complete degradation of the dye with 100% color and 87% TOC removal within 90 min. The active species hydroxyl radicals, being confirmed by electron spin resonance spin-trapping technique, were generated and participated in the degradation of AG by the system. Several intermediate products were detected by electrospray ionization mass spectrometry. On the basis of the analysis of mass data, a possible pathway of AG photodegradation was proposed. To go further in understanding of the degradation efficiency, the effect of different operating conditions such as catalyst loading, initial dye concentration, aeration rate, as well as illumination intensity on the rate of total organic carbon removal were studied. It was found that TiO2/MDEL showed a strong softening effect on the parameters, and the reactions can be carried out over a wide range of conditions.
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