Abstract: A novel and efficient heterogeneous photo-Fenton catalyst has been successfully prepared using co-precipitation method,in which the Fe₂O₃ particles were loaded onto the surface of opal. The catalyst was then used to degrade the Rhodamine B(RhB). The structural characterization of catalyst was analyzed by N₂ adsorption,X-ray diffraction(XRD),scanning electron microscopy(SEM),energy dispersive spectrometry(EDS),Fourier transform infrared spectroscopy(FTIR). The COD(chemical oxygen demand)removal and the influencing factors of degradation effect were analyzed,such as pH,temperature,catalyst dosage,H₂O₂ dosage and initial dye concentration. The results showed that the decolorization rate of RhB and COD removal were 96.49% and 50.51% respectively under agitation after 120min treatment with pH of 2.5,reaction temperature 30℃,dosage of catalyst 0.15g/L,dosage of H₂O₂ 9.0mmol/L and initial concentration of RhB 40.0mg/L. The first-order kinetic equation was fitted to the reaction process,and R²=0.98 under the optimal condition,which indicated that the reaction process obeys the first-order kinetic equation. The decolorization rate of RhB was still higher than 85% when the catalyst used for 5 times,which proved that the catalyst has a good reusability. Finally,the reaction process was analyzed and a possible photocatalytic mec hanism was proposed.

Key words: opal, degradation, heterogeneous fenton, catalyst, waste water

摘要： 采用共沉淀法将Fe₂O₃负载于蛋白土表面，制备出一种新型、高效的非均相光-Fenton催化剂，并将其用于降解罗丹明B染料废水，取得显著效果。利用N₂吸附、X射线衍射（XRD）、扫描电子显微镜（SEM）、能谱分析仪（EDS）、傅里叶红外光谱（FTIR）等方法对复合材料的结构进行了表征。考察了废水中COD去除率及影响降解效果的因素，包括溶液pH、反应温度、催化剂投加量、H₂O₂投加量以及罗丹明B的初始浓度等。试验结果显示，在可见光照射下、pH=2.5、反应温度30℃、催化剂投加量0.15g/L、H₂O₂投加量9.0mmol/L、罗丹明B初始浓度40mg/L的条件下磁力搅拌120min，罗丹明B溶液脱色率达到96.49%，COD去除率达到50.51%。对反应过程进行了一级动力学方程拟合，在最佳反应条件下R²=0.98，说明该反应过程属于一级动力学反应。催化剂循环使用5次后，对罗丹明B的脱色率仍能达到85%以上，证明该催化剂具有良好的循环性能。最后，对反应过程进行了分析，提出了一种可能的反应机理。

关键词: 蛋白土, 降解, 非均相Fenton, 催化剂, 废水