Acta Chimica Sinica ›› 2011, Vol. 69 ›› Issue (04): 452-458. Previous Articles     Next Articles

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  1. (a浙江工业大学生物与环境工程学院 杭州 310014)
    (b浙江大学材料与化学工程学院 杭州 310027)
  • 投稿日期:2010-09-16 修回日期:2010-10-19 发布日期:2010-10-25
  • 通讯作者: 张国亮
  • 基金资助:


Preparation of Acidic Fe-SiO2 Catalyst and Its Catalytic Reactivity in Photo-Fenton Reaction

Liu Liangjun1 Zhang Guoliang*,1 Huang Tao1 Wang Ling1 Meng Qin2   

  1. (1 College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310014)
     (2 College of Material & Chemical Engineering, Zhejiang University, Hangzhou 310027)
  • Received:2010-09-16 Revised:2010-10-19 Published:2010-10-25
  • Contact: Guo-Liang ZHANG

The acid-activated Fe-SiO2 composites were synthesized using tetraethyl orthosilicate (TEOS) as the silica source, cetyltrimethylammonium bromide (CTAB) as the template and salts of Fe as the iron sources. After finishing the preparation, these samples were characterized using scanning electron microscopy for the morphology of the catalysts, X-ray diffractometer for the dispersibility of Fe, and Fourier transform infrared spectrometer for the surface groups. To investigate catalytic activities, various photo-Fenton reactions have been conducted to decontaminate the direct red 4BS simulated wastewater under visible light irradiation. The results indicated that the sample possessing its iron source from FeSO4 had better dispersibility, but lower activities and stability than that from Fe(NO3)3. At initial pH of 6.0, both FS/1 and FS/6 not only led to 100% decolorization of a solution containing 100 mg/L direct red, but also about 79% and 99% total organic carbon were removed in respective system after reaction for 120 min. The kinetics study showed that a model in combination of first order and second order reactions was suitable for this acid-catalyzed process. Analyses of solvent-leaching stability and iron leaching demonstrated these catalysts may have long-term stability.

Key words: Fe-SiO2, visible light, photo-Fenton, direct red 4BS, acid-catalysis