Fe3O4@MSCe/H2O2多相芬顿体系的分解性能及放热规律研究

Study on degradation performance and exothermic law of Fe3O4 @MSCe/H2O2 multiphase Fenton system

摘要:

以5~8 mm粒径半焦为载体,制备了半焦负载Fe₃O₄复合材料（Fe₃O₄@MSCe）,采用SEM、XPS、XRD和FTIR对样品的物化性质和价键结构进行了表征,并研究了Fe₃O₄@MSCe/H₂O₂多相Fenton体系的分解性能和放热规律. 结果表明: Fe₃O₄@MSCe保留了半焦的多孔形态,Fe₃O₄均匀且牢固地负载于半焦颗粒表面；在pH=7.8～11.2碱性条件下,均保持了较好的分解活性；在[H₂O₂]=0.25 mol/L、Fe₃O₄@MSCe投加量为533g·L^-1、pH=7.8、T₀=30 ℃反应条件下,300 mL浓度为0.04 mol·L^-1的邻苯二胺溶液的分解率为90.9%,溶液温度升高数值为7.1 ℃,表现出较好的分解性能和放热特性,为解决现有芬顿技术存在的问题和污水处理的能源化利用提供了技术支撑.

Abstract:

In this paper, a semi-coke with a particle size of 5-8 mm was used as a carrier to prepare a semi-coke loaded Fe₃O₄ composite material (Fe₃O₄@MSCe). The physicochemical properties and valence bond structure of the sample were characterized by SEM, XPS, XRD and FTIR, and the decomposition performance and heat release law of Fe₃O₄@MSCe/H₂O₂ multiphase Fenton system were studied. The results show that Fe₃O₄@MSCe retains the porous morphology of the semi-coke, and Fe₃O₄ is uniformly and firmly supported on the surface of the semi-coke particles. Under the alkaline conditions of pH=7.8～11.2, both maintain good decomposition activity. In the case of [H₂O₂] =0.25 mol/L, Fe3O4@MSCe dosage is 533 g·L^-1, pH=7.8, T₀=30 ℃, 300 mL o-phenylenediamine solution with a concentration of 0.04 mol·L^-1 decomposition, the rate is 90.9%, and the temperature rise value of the solution is 7.1 ℃. It shows good decomposition performance and exothermic characteristics, which provides technical support for solving the problems of the existing Fenton technology and the energy utilization of sewage treatment.