Photocatalytic oxidative degradation of acridine orange solution with metalloporphyrins

In the presence of suspension of polymeric M [meso-tetra (4,4'-biphenybisulfony) phenylporphyrin] (PMTBPBSOPP M = Co, Mn, Cu, Zn, Fe), the photocatalytic oxidative degradation of acridine orange (AO) was investigated in the conditions of irradiation with high pressure mercury lamp (HPML), iodine tungster lamp (ITL) and natural sunlight (NSL) respectively. The results indicated PCoTBPBSOPP had better effects on photodegradation of AO under mild condition. When lower concentration of hydrogen peroxide was presented in the system, PCoTBPBSOPP showed stronger photocatalytic activity and AO aqueous solution was degraded in shorter time. The degradation of AO obeys to the first order kinetics with the equation as lnC(t)=2.52052-0.56546t. R=-0.99704. When the initial concentration of AO was 43.792mg/L, the degradation rate and the decolorization rate of AO was up to 97.76% and 97.16% respectively under the irradiation with HPML. Polymeric of metalloporphyrins could decompose AO by using artificial light source such as HPML and ITL. Furthermore, degradation could be completed in three hours with solar light. It was proved that polymeric of metalloporphyrins had a potential effective application in the wastewater treatment in the heterogeneous photocatalytic oxidation system under natural conditions.