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Dy/WO_3光催化降解罗丹明B的反应机理 被引量:34

Photocatalytic Degradation Mechanism of RB over Dy-Doped WO_3 Photocatalysts
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摘要 在稀土Dy掺杂的WO3光催化降解罗丹明B(RB)体系中,采用紫外-可见吸收光谱、高效液相色谱和电喷雾质谱等技术测定了不同辐照时间下RB的降解中间产物,发现RB的降解过程以苯环的开环氧化反应为主,脱乙基反应为辅.同时发现降解中间产物有脱去1~4个乙基的RB分子碎片;质谱分析发现降解中间产物除了存在上述脱乙基RB的分子碎片外,还存在RB、脱乙基RB的羟基化产物以及结构难以确定的小分子.通过上述分析方法的综合,推出了Dy/WO3光催化降解RB的初步机理. The UV-Vis absorption spectra, high performance liquid chromatograph (HPLC) and electric spray interface mass spectra (ESI-MS) of RB(rhodamine B) were measured under different irradiation time during the photocatalytic procedures of Dy-doped WO3 nanoparticles suspension system. The experimental results indicated that the photodegradation mechanism of the RB mainly involved the broken of benzene ring in RB combined with de-ethylation and hydroxylation process. Some intermediates can be attributed to RB molecular fragments which resulted from severing one, two, three and/or four ethyl from RB, respectively. Moreover, hydroxylation intermediates of RB and its de-ethylation products have also been determined by mass spectra. According to the above-mentioned experimental facts, the primary photocatalytic degradation mechanism of RB over Dy-doped WO3 photocatalysts was proposed.
出处 《武汉大学学报(理学版)》 CAS CSCD 北大核心 2007年第2期127-132,共6页 Journal of Wuhan University:Natural Science Edition
基金 国家自然科学基金资助项目(20573078) 国家高技术研究发展(863)计划(2006AA03Z344) 湖北省杰出人才基金资助项目(2006ABB003) 湖北省教育厅科学技术研究项目(D200625003)
关键词 光催化降解 罗丹明B 反应机理 WO3纳米粉体 photocatalytic degradation rhodamine B reaction mechanism WO3 nanopowder
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参考文献12

  • 1Wu T X, Liu G M, Zhao J C, et al. Photoassisted Gradation of Dye Pollutants. V. Self-Photosensitized Oxidative Transformation of Rhodamine B under Visible Light Irradiation in Aqueous TiO2 Dispersions [J].J Phys Chem, 1998,102B: 5845-5851.
  • 2Zhang Y H, Xu H L, Xu Y X,et al. The Effect of Lanthanide on the Degradation of RB in Nanocrystalline Ln/TiO2 Aqueous Solution[J]. J Photochem and Photobio A :Chem,2005,170:279-285.
  • 3Kamat P V. Photochemistry on Nonreactive and Reactive (Semiconductor) Surfaces[J]. Chem Rev, 1993,93(1):267-300.
  • 4Spadaro J T, Isabelle L, Renganathan V. Hydroxyl Radical Mediated Degradation of azo Dyes-evidence for Benzene Generation [J]. Environ Sci Technol, 1994,28:1389-1393.
  • 5Prevot A B, Basso A, Baiocchi C,et al. Analytical Control of Photocatalytic Treatments: Degradation of a Sulfonated azo Dye [J]. Anal Bioanal Chem, 2004,378(1) :214-220.
  • 6Riu J, Schonsee I, Barcelo D, Rafols C. Determination of Sulphonated azo Dyes in Water and Wastewater[J]. Trends Anal Chem , 1997,16(7):405-419.
  • 7刘华俊,彭天右,肖江蓉,赵德,彭正合.Tb^(3+)掺杂纳米WO_3的制备及其光催化性能[J].武汉大学学报(理学版),2005,51(4):397-401. 被引量:15
  • 8Baiocchia C, Brussinoa M C, Pramauroa E, et al.Characterization of Methyl Orange and Its Photocatalyric Degradation Products by HPLC/UV-Vis Diode Array and Atmospheric Pressure Ionization Quadrupole Ion Trap Mass Spectrometry [J]. Inter J Mass Spectr , 2002,214 : 247-256.
  • 9Prevot A B, Basso A, Baiocchi C, et al. Analytical Control of Photocatalytic Treatments: Degradation of a Sulfonated Azo Dye [J]. Anal Bioanal Chem, 2004,378(1) :214-220.
  • 10Satoshi H, Aiko S, Hisao H. Environmental Remediation by an Integrated Microwave/UV Illumination Method. V. Thermal and Nonthermal Effects of Microwave Radiation on the Photocatalyst and on the Photodegradation of Rhodamine B under UV/Vis Radiation [J]. Environ Sci Technol, 2003,37 (24): 5813-5822.

二级参考文献26

  • 1Wang Tian-min, Wang Hui-yao,Xu Pei,et al. The Effect of Properties of Semiconductor Oxide Thin Films on Photo-Catalytic Decomposition of Dyeing Waste Water [J]. Thin Solid Films,1998,334:103-108.
  • 2Zhang Yu-hong, Xiong Guo-xing, Yao Nan,et al. Preparation of Titania-Based Catalysts for Formaldehyde Photocatalytic Oxidation fom TiCl4 by the Sol Gel Method [J]. Catalysis Today,2001,68:89-95.
  • 3Swarnalatha B, Anjaneyulu Y. Studies on the Heterogeneous Photocatalytic Oxidation of 2,6-Dinitrophenol in Aqueous TiO2 Suspension[J]. Journal of Molecular Catalysis A:Chemical,2004,223:161-165.
  • 4Ollis D F,Al-Ekabi H. Photocatalytic Purification and Treatment of Water and Air[M]. Amsterdam:Elsevier Science Publishers,1993.
  • 5Sampa C,Dutta B K. Photocatalytic Degradation of Model Textile Dyes in Wastewater Using ZnO as Semiconductor Catalyst[J]. Journal of Hazardous Materials B,2004,112:269-278.
  • 6Kumar A,Negi D P S. Photophysics and Photocatalytic Properties of Cd(OH)2-Coated Q-CdS Clusters in the Presence of Guanine and Related Compounds[J]. Journal of Colloid and Interface Science,2001,238:310-317.
  • 7Solymosi F,Raskó J,Papp E,et al. Catalytic Decomposition and Oxidation of CH3Cl on Cr2O3-Doped SnO2[J]. Applied Catalysis A,1995,131(1):55-72.
  • 8Rufus I P,Viswanathan B,Ramakrishnan V,et al. Cadmium Sulfide with Iiridium Sulfide and Platinum Sulfide Deposits as a Photocatalyst for the Decomposition of Aqueous Sulfide [J]. Journal of Photochemistry Photobiology A:Chemistry,1995,91(1):63-66.
  • 9Wang Hui-yao, Xu Pei, Wang Tian-min. The Preparation and Properties Study of Photocatalytic Nanocrystalline/Nano- Porous WO3 Thin Films[J]. Materials and Design,2002,23:331-336.
  • 10Kominami Hiroshi, Kato Jun-ichi, Murakami Shin-ya. Solvothermal Syntheses of Semiconductor Photocatalysts of Ultra-High Activities[J]. Catalysis Today,2003,84:181-189.

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