Degradation of toluene gas at the surface of ZnO/SnO2 photocatalysts in a baffled bed reactor
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To eliminate volatile org. compds. (VOCs) from contaminated air, a novel medium-scale baffled photocatalytic reactor was designed and fabricated, using immobilized ZnO/SnO2 coupled oxide photocatalysts. Toluene was chosen as a representative pollutant of VOCs to investigate the degrdn. mechanism and the parameters affecting photocatalytic degrdn. efficiency. The preliminary exptl. results indicate that the degrdn. efficiency of toluene increased with the increase of the light irradn. dosage, while it decreased with the increase of concns. of toluene. The degrdn. efficiency increased rapidly with the increase of the relative humidity in a low humidity range from 0 to 35%, but decreased gradually in a high relative humidity (i.e., >35%). The optimum exptl. conditions for toluene degrdn. is a toluene concn. of 106 mg m-3, a relative humidity of 35%, and an illumination intensity of ca. 6 mW cm-2 at the surface of ZnO/SnO2 photocatalysts. The intermediates produced during the gaseous photocatalytic degrdn. process were identified using the GC-MS technique. Based on these identified intermediates, the photocatalytic mechanism of toluene into ZnO/SnO2 coupled oxide catalyst was also deduced.
Research on Chemical Intermediates
Physical Chemistry not elsewhere classified
Solid State Chemistry
Colloid and Surface Chemistry