Synthesis Of Modified Chlorophyll Photocatalyst And Photodegradation Of Bisphenol A

Metalloporphyrins can improve the activity of oxygen and exhibit higher catalytic abilityand selectivity under mild conditions as CytochromeP-450, the search for availablemetalloporphyrin as photocatalysts for photocatalytic oxidation of organic pollutants is animportant subject in the field of metal porphyrin biomimetic catalysis. However, its practicaluse in aqueous media is limited because of its higher price and lower synthesis yield, theproblem of self-reactions among porphyrin molecules and the difficulty of recovery. Naturalchlorophyll is magnesium porphyrin which presents high photoabsorption capacity atwavelengths present in sunlight. Fortunately, it is widely existed in natural plants and can beeasily extracted. With chlorophyll is unstable, self-reactions among porphyrin molecules andthe demand of catalyst recovery in mind, it needs to be modified. Modified chlorophyll wasimmobilized on magnetic mesoporous microspheres to develop the novel biomimeticphotocatalyst.According to the relationship between the structure features of chlorophyll moleculesand their chemical properties, different kinds of iron porphyrin complex were synthesized bymodifying the chemical structure of chlorophyll which was a widespread natural porphyrin.The change characteristics of UV-Vis and Infrared spectra between them were analyzedprofoundly. Modified chlorophyll was immobilized on magnetic mesoporous microspheres todevelop heterogeneous photocatalyst, bisphenol A was used as model compound to evaluatethe photodegradation performance of catalysts for phenols organic pollutants under simulatedsunlight irradiation.The catalyst was characterized by X-ray diffraction, Brunauer-Emmett-Teller,transmission electron microscopy, thermo gravimetric analyzer and magnetometer. The effectsof different reaction condition such as the initial concentration of BPA, the amount of catalyst,solution pH and the amount of added H2O2on BPA degradation individually was studied. Thekinetics on catalytic reaction is investigated profoundly, meanwhile, the intermediate productsformed in the photocatalytic degradation process were monitored using GC-MS analysis.