铁负载煤气化渣基活性炭非均相Fenton体系降解甲基橙染料废水的工艺优化及其机理研究

Kinetic Studies of Degradation of Methyl Orange Dye Wastewater by Heterogeneous Fenton-like Using Coal Gasification Slag-based Activated Carbon-Fe

基于煤气化残渣为原料制备出高比表面积的活性炭,采用浸渍法制备负载Fe^(3+)的煤气化渣基活性炭,并将所制材料应用于非均相Fenton体系降解染料废水中甲基橙的实验研究。实验结果表明铁负载煤气化渣基活性炭/H_2O_2非均相Fenton体系降解甲基橙最佳条件为:铁负载量21%,H_2O_2投加量为40 mM,pH值为5,甲基橙初始浓度为250 mg/L和最佳温度为328 K,甲基橙降解率可以达到97%以上。Fenton试剂降解甲基橙反应的活化能Ea和指前因子A分别为4.04 k J/mo L和36393,并且符合一级动力学,根据计算得到其降解甲基橙动力学模型为-d C/dt=-0.039174[Fe^(3+)]0.3825[H_2O_2]^(0.619)[Cl^-]^(1.8754)。

Coal gasification slag as raw materials to produce the activated carbon with high specific surface area, the obtainedsample was doped with ferric by means of impregnation method, followed by application of Fenton reaction for decomposition dyewastewater （methyl orange）. The experimental results show that the optimal operating condition for heterogeneous Fenton are asfollows ： ferric irons loading dosage is 21%, dosage of H2 02 is 40 mM, pH value is 5, initial methyl orange concentration is 250mg/L and the reaction temperature is 328 K. And the degradation efficiency could reach 97%. The reaction activation energyand anaphoric factor are 4.04 kJ/mol and 36393, respectively, and the model for methyl orange molecules degradation was -dC/dt = -0. 039174[ Fe3 ＋ ]0.3825 [ Hi202 ]0.619 [ CI- ] 1.8754