DMP Degraded By Modified BiPO₄ With Photocatalysed Method

With the fast development of the technology, which brings us much convenient life, the environment is becoming worse and worse. Considering the influence of dimethyl phthalate (DMP), it has shown negative effect in the endocrine system, reproductive system, immune system of human’s and animals’. So, the department of food hygiene supervision lists DMP as one of the most significant treatment programs. Many countries have spent much money to accelerate the research speed on DMP and set up relevant rules and regulations to limit its productioaAmong numerous chemical, physical, biology methods to treat plasticizer, photocatalysis has been regarded as a useful method for organic contaminant degradation, especially in DMP degradation. Because of its easy operation, high efficiency, no selections etc. TiO2 is a widely used photocatalytic material. Howver, it has two disadvantages. One is the large band gap so that it just works under UV field, and the other is the low quantum yield. To solve these two problems, plenty of the photocatalytic systems have been invented. Bi salts have been stood out among these photocatalytic materials because of their layered structure. In 2010, BiPO4 was first published as photocatalyst in Yongfa Zhu’s group, which has been found to have the high degradation capability under UV light, even up to 2 times than P25 for dye, phenol, aromatic hydeocarbon degradation. Up to now, there has been no any research institution or university about the study on the degradative pathway of DMP. As a consequence, this thesis has modified BiPO4, and analyzed the degradation pathway of DMP with the modified BiPO4 The details are as follows:1) H2O2 was used to modify BiPO4 to enhance the quantum efficiency enhancement Moreover, the degradation route of DMP has been explored by testing the intermediate with HPLC and GC-MS instruments for mechanism explanation.2) BiPO4 was modified by Cldoping so as to extend its absoption to visible light XRD, SEM, DRS and so on were used to test the samples. It is shown that CF doping can change the band gap structure of BiPO4, leading to the change of the degradation pathway of DMP.