CuCe氧化物催化剂的制备及CWPO降解双酚A废水研究

为解决Fenton法存在活性组分流失及通常在pH 2～3条件下运行的局限性，采用柠檬酸络合法制备了CuCe氧化物催化剂，建立了双酚A非均相催化湿式过氧化氢氧化（CWPO）反应体系。考察了焙烧温度、Cu/Ce摩尔比、H₂O₂用量、双酚A初始浓度和pH对催化剂物化结构和CWPO性能的影响。并分析了可能的降解路径。结果表明：催化剂具有良好的高温稳定性和pH适应性，在pH 1.6～7.9范围内对双酚A都具有较高的降解性能，不需要调节pH。在焙烧温度450℃、Cu/Ce摩尔比1.0、催化剂用量1 g·L^-1、H₂O₂用量196 mmol·L^-1、BPA浓度152 mg·L^-1、pH 6.6、反应温度75℃、反应95 min后，BPA和TOC去除率分别为91.8%和84.5%,Cu²⁺析出浓度为19.3 mg·L^-1。推测了双酚A可能的降解路径。

Preparation of CuCe oxide catalyst for CWPO degradation of bisphenol A

In order to overcome the limitation to loss of active components of Fenton as well as operation only under pH 2—3, a CuCe oxide catalyst was prepared by a citric acid complex method. A catalytic wet peroxide oxidation (CWPO) reaction system was also established, which aimed at degradation bisphenol A. The effects of calcination temperature, Cu/Ce molar ratio, H₂O₂ dosage, initial concentration of bisphenol A and pH on the structure of the catalyst and the performance of the CWPO were investigated. Possible degradation pathways were also analyzed.The results show that the catalyst has good high temperature stability and pH adaptability, and has high degradation performance for bisphenol A in the range of pH 1.6 to 7.9, and does not need to adjust the pH. The removal rates of BPA and TOC were 91.8% and 84.5%, respectively, with the concentration of Cu²⁺ at 19.3 mg·L^-1 after calcination of 450℃, Cu/Ce molar ratio at 1.0, catalyst dosage at 1 g·L^-1, hydrogen peroxide dosage at 196 mmol·L^-1, BPA concentration at 152 mg·L^-1, pH at 6.6, reaction temperature at 75℃ and reaction for 95 min. The possible degradation pathways of bisphenol A were proposed.