Fe2O3@SCe多相芬顿催化剂的制备及其降解放热性能

为研究多相Fenton体系降解有机污水过程的放热规律，为污水处理的能源化利用提供技术支撑，本文以半焦（SCe）为载体，制备了Fe₂O₃@SCe新型复合材料，并对复合材料进行了BET、FTIR、XRD、SEM表征，研究了Fe₂O₃@SCe/H₂O₂多相Fenton体系处理邻苯二胺（OPD）模拟废水的降解性能和放热规律.结果表明，Fe₂O₃均匀负载于SCe颗粒表面，Fe₂O₃@SCe复合材料保留了改性SCe的多孔形态和强吸附性，在3.1~8.9的pH值范围内均表现出较高的催化活性；Fe₂O₃@SCe/H₂O₂多相Fenton体系在去离子水中自身分解和在邻苯二胺模拟废水的降解反应都释放了大量的热量，在OPD]= 0.04mol/L；pH=7.8；T₀=30℃；H₂O₂]=0.25mol/L；Fe₂O₃@Sce]=533g/L；t=180min反应条件下的溶液温度升高数值为7.1℃，降解率为88.2%； H₂O₂的投加浓度是影响反应放热量的主要因素.

Preparation of Fe2O3@SCe heterogeneous fenton catalyst and its degradation exothermic performance

Exothermic laws of a heterogeneous Fenton system in the degradation of organic sewage were investigated to facilitate the energy utilization in sewage treatment practices. In this study, semicoke (SCe) was used as the carrier to prepare a novel Fe₂O₃@SCe composite material, which was then characterized by Brunauer, Emmett, and Teller surface area analysis, Fourier-transform infrared spectroscopy, x-ray diffraction, and scanning electron microscopy. The degradation performance and exothermic laws of the Fe₂O₃@SCe/H₂O₂ heterogeneous Fenton system for the treatment of o-phenylenediamine (OPD) organic sewage were studied. The results showed that Fe₂O₃ was uniformly loaded on the surface of the SCe particles. The Fe₂O₃@SCe composite material retained its porous form and exhibited strong adsorption capacity and high catalytic activity over a wide pH range (3.1~8.9), an effective broadening of the pH range of the classic homogeneous Fenton reaction. Both the dissolution reactions in Fe₂O₃@SCe/H₂O₂ heterogeneous Fenton and the degradation reactions of Fe₂O₃@SCe/H₂O₂ and simulated OPD sewage released large amounts of heat. The temperature of the solution reached 7.1℃ higher and was accompanied by a degradation efficiency of 88.2% under the following experimental conditions: OPD] = 0.04mol/L, pH = 7.8, T₀ = 30℃, H₂O₂] = 0.25mol/L, Fe₂O₃@SCe] = 533g/L, and t = 180min. The concentration of H₂O₂ was found to be the dominant factor affecting exothermic heat release during the heterogeneous Fenton reaction.