摘要：

利用粉煤灰负载Fe³⁺制备异相催化剂,研究了采用该催化剂的UV/Fenton体系对苯酚的降解效果,探讨了催化剂的制备方法对催化效率和稳定性的影响,并研究了反应体系、铁负载量、H₂O₂投加量和初始pH对苯酚降解效率的影响,考察了催化剂的重复利用性能.研究结果表明:由浸渍法制得的Fe-A1催化剂表现出了较好的稳定性及催化性能,在pH为3,H₂O₂投加量为5.0mmol/L,催化剂投加质量浓度为0.2g/L的基准反应条件下,处理500mL初始质量浓度为100mg/L的苯酚模拟废水,60min之内对苯酚的降解率达95%以上,并且催化剂重复利用3次后,60min内对苯酚的降解率仍可达93%以上.

关键词: 催化剂, UV/Fenton, 苯酚, 非均相反应

Abstract:

Heterogeneous catalyst has been prepared with fly ash loaded with Fe³⁺, and its effect on the degradation of phenol in UV/Fenton has been studied.The effects of the preparation method on its catalyzing efficiency and stability are discussed.Furthermore, the effects of its reaction system, loading capacity of Fe³⁺, dose of H₂O₂, and initial pH on phenol degradation efficiency are investigated.Moreover, the reusability of the catalyst is examined.The experimental results show that catalyst Fe-A1 prepared by impregnation method has better stability and catalyzing capacity.The standard conditions are as follows： pH=3, H₂O₂ dosage=5.0 mmol/L, and the catalyst dosage=0.2 g/L,the degradation efficiency of phenol reaches above 95% within 60 min for 500 mL of phenol simulated wastewater with an initial mass concentration of 100 mg/L.After the catalyst is reused for 3 times, the phenol degradation efficiency is still above 93% within 60 min.

Key words: catalyst, UV/Fenton, phenol, heterogeneous reaction

中图分类号: 

• X703.1