Research On Highly Efficient Photo Catalytic Decomposition Of Endocrine Disrupting Chemicals-bisphenol A

Endocrine Disrupting Chemicals(EDCs), which is also called Environmental Hormone, is a kind of exogenous chemicals that can destroy normal metabolism,functions of exudation and procreation of organism and human being through disrupting the synthesis, exudation, and metabolism of nature hormone. As an important material of organic industry, Bisphenol A(BPA) exists widely in the environment, which is very harmful to organism and human being.Titania heterogeneous photocatalysis oxidation technology has being used in the treatment of EDCs because of its safety, high reaction speed, complete oxidation, low energy consumption and no secondary contamination. In order to set up a highly efficient treatment system of BPA , a new gas-liquid-solid circulating slurry photocatalytic reactor(GLSCSPCR) has been designed in this paper.Then a comprehensive performance evaluation of GLSCSPCR by comparing with common-used annular and air-lift slurry photocatalytic reactors though the degradation and nitrogen removal of an azo dye with respect to the apparent quantum yield of azo dye degradation, the rate and electrical energy consumption of nitrogen removal. The study shows that the newly designed GLSCSPCR behaves better.Self-made rare earth doped photocatalyst Gd-TiO2 had been used in GLSCSPCR to treat simulated EDCs waste water——BPA aqueous solution. Effect of operation parameters such as catalyst concentration, superficial gas velocity and superficial liquid velocity to the photocatalytic degradation BPA has been studied. Results show when the volume is 1800 ml, BPA original concentration is 10 mg/L, the optimized operation parameters are 6 g/L, 8.34×10-3 m/s and 1.11×10-2 m/s. The photocatalytic degradation rate of BPA can reach more than 90% after 120 min degradation under optimized condition.More over, comparative research of Gd-TiO2 and commercial photocatalyst P25-TiO2 has investigated in this paper, the former one is more excellent not only in photocatalytic efficiency but also the performance of sedimentation.In conclusion, Gd-TiO2 photocatalyst and GLSCSPCR can be a high efficient treatment system of BPA, which shows good industrial application.