棒状FeMoO4材料的制备及其活化性能

Preparation and activation properties of rod-shaped FeMoO4 materials

摘要:

摘要：以FeSO4·7H2O和Na2MoO4·2H2O为原料采用水热法合成了棒状FeMoO4，通过XRD、Raman、SEM对其结构和形貌进行了表征，研究了其对过硫酸盐的活化性能。以苯酚为目标污染物，考察了过硫酸钠浓度、苯酚初始浓度、溶液初始pH和反应温度对苯酚降解率的影响，初步探究了体系中起主要作用的自由基种类。结果表明，pH在2.00~11.00内，FeMoO4活化的过硫酸盐对苯酚表现出良好的降解性能，铁离子最大溶出量为1.663 mg/L。最佳降解条件为：溶液初始pH为3.00，反应温度为30℃，FeMoO4质量浓度为0.4 g/L，n(过硫酸钠)∶n(苯酚)=25∶1，6 h内苯酚降解率达97.20%；非均相FeMoO4/Na2S2O8体系降解苯酚符合一级反应动力学，反应活化能为53.49 kJ/mol；自由基淬灭实验结果表明，SO4-·是降解苯酚的主要氧化剂。

Abstract:

Abstract: The rod-shaped FeMoO4 was synthesized by hydrothermal method using FeSO4·7H2O and Na2MoO4·2H2O as raw materials, and its structure and morphology were characterized by using XRD, Raman and SEM. It studied the performance of FeMoO4 activated persulfate. With phenol as the target pollutant, the effects of sodium persulfate concentrations, phenol initial concentrations, initial pH of phenol solution and temperature on the degradation rate of phenol were investigated, and the types of free radicals that played a major role in the system were initially explored. The results showed that the persulfate activated by FeMoO4 showed good performance in the degradation of phenol between pH=2.00 and pH=11.00, and the maximum dissolution of iron ion was 1.663 mg/L. The optimum degradation conditions were 0.4 g/L of FeMoO4, sodium persulfate/phenol molar rates of 25∶1, the initial pH of 3.00. In the case of this, the phenol degradation rate was 97.20% in 6 h at 30℃. The degradation of phenol by FeMoO4/Na2S2O8 matched first order kinetic. The calculated activation energy was 53.49 kJ/mol. The results of the free radical quenching experiment showed that SO4-· was the primary oxidant for the degradation of phenol.