Fe-O/CeO_2催化剂的制备、表征及其对垃圾渗滤液微波催化氧化活性的研究

Characterization and catalytic activity of Fe-O/CeO_2 catalyst in landfill leachate treatment by microwave catalytic oxidation process

以浸渍法制备用于常温常压微波催化氧化工艺的负载型Fe-O/CeO2催化剂并通过XRD和SEM手段进行表征;利用优化制备后的催化剂进行微波催化氧化垃圾渗滤液的研究。结果表明：Fe-O/CeO2催化剂中活性组分Fe以α-Fe2O3和CeFe2的形式存在。在渗滤液初始CODCr5 736mg/L、氨氮1 840 mg/L、色度500倍和pH 8.69的条件下,在Fe-O/CeO2投加量10 g/L、H2O2（30%）投加量22.5 mL/L、微波功率800 W、微波辐射时间10 min和水样初始浓度C水样/C原水为100%的最佳运行条件下,微波催化氧化工艺对CODCr、氨氮和色度的去除率分别为73%、78%和85%;在反应的第4~8 min和第2~8 min,CODCr和氨氮去除率分别与反应时间呈近似直线的关系。

Fe- O/CeO2 catalyst for the microwave catalytic oxidation process under normal temperature and atmospheric pressure was prepared by impregnation method and characterized by X-ray diffraction （XRD） and scanning electron microscope （SEM）. This kind of catalyst was used in the study of microwave catalytic oxidation landfill leach treatment, and the results showed that： active Fe in Fe- O/CeOz existed with the form of α - Fe2O3 and CeFe2. The 73% CODer removal rate,78% NH3--N removal rate and 85% color removal rate could be achieved at the conditions of incipient CODCr 5 736 rag/L, NH3--N 1 840 mg/L,colority 500, pH 8. 69, Fe-O/CeO2 dosage 10 g/I., H202 dosage（30%） 22.5 mL/I., microwave power 800 W and initial water sample concentra- tion 100%. The CODer removal rate and NH3--N removal rate were in linear with the reaction time respectively during the time from 4 to 8 min and 2 to 8min.