The Enhanced Effect Of EDTA On The H_2O 2 Activation Ability Of BiFeO₃ To Degradate Bisphenol A

Bisphenol A, as a fine chemical material, was widely used in chemical industry. Studies have shown that it's an environmental estrogen which can affect normal hormones, reduce organism immunity, harm against nervous system and cause health hazards. As a material which was detected in environment wih high frequency, it was widely found in wastewater, sludge and sediment. In order to solve the pollution, varieties of methods were taken, and Advanced Oxidation Processes was proved to be an efficient method.In this dissertation, the reaction of perovskite material BiFeO₃ as a Fenton-like catalyst activated H₂O₂ for degradation bisphenol A was investigated. Meanwhile, adding EDTA, C2O42- and other agents in the reaction, the results show that EDTA is the best agent for the modification of BiFeO₃ because it can enhance the catalytic effect.The effect of the concentration of EDTA, the concentration of H₂O₂, pH value and the reaction temperature in the degradation process were investigated. The result showed that EDTA could enhance the degradation in the first 15min rapidly. Using ion chromatography to monitor the process in the most optimal conditions, EDTA and bisphenol A could be degraded simultaneously by BiFeO₃ whether bisphenol A is in present or not. And in both situation, the main products were IMDA and formate, which shows that the addition of EDTA did not change the path of BiFeO₃ as a Fenton-like catalyst in the oxidative degradation of bisphenol A. At the same time, it's provides a guideline for us in co-degradation of EDTA and bisphenol A in the environment.The results of ATR-FIIR, Zeta potential and particle size distribution of modified BiFeO₃ paticles has demonstrated reasons of enhancement.The effect may be due to: (1)EDTA can form C-O-Fe bond in the surface BiFeO₃; (2)it can enable the decrease of pH isoelectric point of BiFeO₃ particles; (3)it can decrease the particle size of BiFeO₃, increase its surface area, make it's easier for dispersion, and then improved the catalytic activity.