Degradation Of Phthalates By Photocatalysis With H₃PW₁₂O₄₀/TiO₂ In Aqueous Solution

Phthalates are widely used as plasticizers in different resins, especially PVC resins. As aconsequence, phthalates are released into the natural environment during manufacture, used,disposal and leaching from plastic materials. Phthalates have been detected in natural waters,marine sediments, bodies and foods. More and more research groups have focused theirattention on the degradation of phthalates. Photocatalytic redox reactions used in degradingpollution organics have gained wide interest because of their simplicities, economicadvantages and without the second pollution.According to the method of document, I prepared the nanocomposites, H₃PW₁₂O₄₀/TiO2(anatase). The resulting H₃PW₁₂O₄₀/TiO2 nanocomposites, in a H₃PW₁₂O₄₀ doping level at22.99%. The structures and physicochemical properties of the composites were characterizedby UV diffuse reflectance spectroscopy (UV/DRS),31P magic-angle spinning (MAS) NMRand transmission electron microscopy.The H₃PW₁₂O₄₀/TiO2-photocataly degradation of dimethyl phthalate in aqueoussolutions was investigated by using solar. The effect of TiO2 concentration, illuminationtime, the initial concentration were investigated. Result showed that the degradation ofdibutyl phthalate (DBP) could achieve 80% when the conditions of experiments weresatisfied with catalyst was 0.3g, radiation time was 5h, and initial concentration of DBP was50mg/L. The degradation of phthalates ester in H₃PW₁₂O₄₀/TiO2/VIS system was faster thanTiO2 alone or VIS lamp irradiation alone. A pseudo-first order reaction kinetics was proposedto simulate the photocatalytic degradation of dibutyl phthalate. And in the same conditions,the degradation rate of dimethyl phthalate (DMP) and dioctyl phthalate (DOP) weredetermined, the order followed: DOP > DBP> DMP.