Fe3O4／CeO2-H2O2非均相类Fenton体系下降解TCE的研究

Degradation of TCE by Fe_3O_4/CeO_2-H_2O_2 heterogeneous Fenton-like system

采用浸渍法成功合成了新型催化剂纳米Fe3O4/CeO_2,并且用Fe3O4/CeO_2-H_2O_2非均相Fenton体系对TCE进行降解研究,考察了初始pH、H_2O_2浓度、温度及催化剂投加量等因素对于TCE降解效率的影响.实验结果表明,Fe3O4/CeO_2-H_2O_2非均相Fenton体系对TCE具有较好的去除效果:在初始pH=3,温度50℃,H_2O_2浓度30 mmol·L-1和Fe3O4/CeO_2投加量0.5 mg·L-1时,TCE去除率高达97.29%.同时实验结果表明pH在2~7范围内对TCE均有降解效果,所以相对于传统Fenton体系,该体系拥有更宽pH应用范围.目标污染物的降解符合一级动力学,反应活化能为30.77 k J·mol-1,表明反应易于进行.

As a new catalyst, Fe3O4/CeO2 was synthesised by using impregnated method, and the Fe3 O4/CeO2-H202 heterogeneous Fenton system was successfully applied to the degradation of TCE. The effects of different reaction conditions like initial pH, H202 concentrations, temperature and the dosage of catalyst on the degradation efficiency of TCE were evaluated. Results show that this heterogeneous Fenton system had excellent performance on TCE degradation, and a high TCE removal efficiency of 97.29% could be achieved under the initial pH 3, 50℃, 30 mmol·L^-1 H202 and with the dosage of Fe304/CeO2 0.5 g. L-1. Compared with the traditional Fenton reaction, Fe304/CeO2-H202 performed well under wider range of pH. The reaction conformed to the first-order kinetics and was easy to take place with activation energy of 30.77 kJ. mol^-1.