Wu Yan-Yu, Zheng Ke, Chen Dong-Yu, Qin Fang-Hui, Zhou Shao-Qi
School of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, China.
Huan Jing Ke Xue. 2010 Sep;31(9):2085-91.
Humic substances (HS) oxidation degradation by Fenton's reagent was kinetically investigated in this study. HS was removed by both oxidation and coagulation during Fenton treatment. Moreover, initial pH, the dosage of Fenton's reagent and initial concentration of HS had a significant impact on HS oxidation rate and the oxidation mainly occurred at the first 60 min of reaction time. The empirical kinetic equation for HS oxidation by Fenton's reagent under the conditions of 308 K of temperature, 4.0 of pH, 5-40 mmol x L(-1) of Fe2+, 40-120 mmol x L(-1) of H2O2, 250-1 000 mg x L(-1) of HS, could be described using a kinetic model, which was fitted very well with the experimental data. The overall reaction order is 2.34. The lower activation energy of 14.9 kJ x mol(-1) shows that Fenton reaction can be initiated easily. The reaction order of H2O2 (0.86) is higher than that of Fe2+ (0.47), which indicates that the effect of initial H2O2 concentration is greater than that of Fe2+ on the oxidation degradation of HS by Fenton process.
本研究对腐殖质（HS）在芬顿试剂作用下的氧化降解进行了动力学研究。在芬顿处理过程中，HS通过氧化和混凝作用被去除。此外，初始pH值、芬顿试剂用量和HS初始浓度对HS氧化速率有显著影响，且氧化主要发生在反应的前60分钟。在温度308K、pH值4.0、Fe2+浓度为5 - 40 mmol·L(-1)、H2O2浓度为40 - 120 mmol·L(-1)、HS浓度为250 - 1000 mg·L(-1)的条件下，HS在芬顿试剂作用下氧化的经验动力学方程可用一个动力学模型来描述，该模型与实验数据拟合良好。总反应级数为2.34。较低的活化能14.9 kJ·mol(-1)表明芬顿反应易于引发。H2O2的反应级数（0.86）高于Fe2+的反应级数（0.47），这表明在芬顿法氧化降解HS过程中，初始H2O2浓度的影响大于Fe2+的影响。
