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N掺杂TiO2可见光催化降解有机物机理研究

Keywords: 氮掺杂,二氧化钛,光催化,有机物,降解,羟基自由基

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Abstract:

实验研究了掺杂N的TiO2光催化剂在可见光下对有机物的降解机理,研究方法有:加入自由基俘获剂探索对反应速率的影响、有机物降解过程TOC与脱色比较,化学探针法测定了实验中存在的HO·。结果表明,有机物在脱色的同时苯环也在断裂,说明有机物的降解是受无选择性的氧化剂攻击而完成;除亚甲基蓝以外,加入自由基俘获剂对可见光反应速率均有抑制现象,证明自由基的攻击是有机物可见光催化降解的主要途径。分别以二甲基亚砜和水杨酸为分子探针,实验结果证明了光催化反应系统中存在HO·物种,前者与HO·反应形成特定的偶氮结构有机物在425nm处有吸收,后者与HO·反应生成2,3-二羟基苯甲酸和2,5-二羟基苯甲酸。亚甲基蓝、苯酚和水杨酸经5h的可见光催化降解后,其TOC分别降低了62.8%、78.9%和96.0%,说明掺杂N的TiO2有较强的可见光催化降解有机物能力。

References

[1]  Hu Chun;Hu Xuexiang;Wang Liusuo,Visiblelight-induced photocatalytic degradation of azodyes in aqueous AgI/TiO2 dispersion,Environmental Science and Technology,2006(24).
[2]  HuC;TangY.C;JiangZ,Characterizationandphotocatalyticactivityofnoble-metalsupportedsurfaceTi02/Si02,Appl Cata! A:Gen,2003(2).
[3]  Choi W;Termin A;Hoffmann M,The role of metal ion dopants in quantum-size Ti02: Correlation between photoactivity and charge carrier recombination dynamics,Journal of Physical Chemistry,1994(51).
[4]  Mrowetz M;Balcerski W;Colussi A. J,Oxidative power of nitrogen-doped TiO2 photocatalysts under visible illumination,Journal of Physical Chemistry B,2004(45).
[5]  Lin Z. S;Orlov A;Lambert R. M,New insights into the origin of visible light photocatalytic activity of nitrogen-doped and oxygen-deficient anatase TiOz,Journal of Physical Chemistry B,2005(44).
[6]  Gopal, NO ;Lo, HH ;Ke, SC,Chemical state and environment of boron dopant in B,N-codoped anatase TiO2 nanoparticles: An avenue for probing diamagnetic dopants in TiO2 by electron paramagnetic resonance spectroscopy,Journal of the American Chemical Society?,2008, 130(9).
[7]  Yu Guo ;Xi-wen Zhang ;Wei-Hao Weng ;Gao-rong Han,Structure and properties of nitrogen-doped titanium dioxide thin films grown by atmospheric pressure chemical vapor deposition,Thin Solid Films?,2007, 515(18).
[8]  Huang X. H;Tang Y. C;Hu C.Preparation and characterization of visible light active nitrogen doped TiO2 photocatalyst[J].Journal of Environmental Sciences,2005(4)
[9]  Kitano, M ;Funatsu, K ;Matsuoka, M ;Ueshima, M ;Anpo, M,Preparation of nitrogen-substituted TiO2 thin film photocatalysts by the radio frequency magnetron sputtering deposition method and their photocatalytic reactivity under visible light irradiation,The journal of physical chemistry. B, Condensed matter, materials, surfaces, interfaces & biophysical?,2006, 110(50).
[10]  方晓明,张正国,陈清林.具可见光活性的氮掺杂二氧化钛光催化剂[J].化学进展,2007(9)
[11]  秦好丽,古国榜,柳松.溶胶凝胶法制备氮掺杂二氧化钛及其可见光活性的研究[J].太阳能学报,2007(4)
[12]  唐玉朝;黄显怀;李卫华.N掺杂TiO:光催化剂的微结构与吸光特性研究[J].分子催化,2010(4)
[13]  Lee J;Choi W;Yoon J,Photocatalytic degradation of N-nitrosodimethylamine: mechanism, product distribution,and TiO2 surface modification,Environmental Science and Technology,2005(17).
[14]  Quici N;Morgada M. E;Piperata G Oxalic acid destruction at high concentrations by combined heterogeneous photocatalysis and photo-Fenton processes [J] 2005(3/4)
[15]  任学昌;史载锋;孔令任.TiO2:薄膜光催化体系中羟基自由基的水杨酸分子探针法测定[J].环境科学学报,2008(4)
[16]  孙剑辉;乔利平;孙胜鹏.氮掺杂型纳米TiO2:在可见光及太阳光下的光催化性能研究[J].环境科学学报,2006(10)
[17]  Brezonik P;Brekken J. F,Nitrate-induced photolysis innatural waters : controls on concentrations of hydroxyl radical photo-intermediates by natural scavenging agents,Environmental Science and Technology,1998(19).
[18]  于颖慧;侯艳君;高金胜.水中本底成分对0,/H:O:氧化降解2,4-D的影响[J].环境科学学报,2007(8)
[19]  Suthanthiran M;Solomon S. D;Williams P. S,Hydroxyl radical scavengers inhibit human natural killer cell activity,Nature,1984(5948).
[20]  包南;孙剑;张峰.N掺杂TiO2:纳米晶:水热一热分解法制备及光催化活性[J].无机化学学报,2007(1)
[21]  徐向荣,王文华,李华斌.比色法测定Fenton反应产生的羟自由基及其应用[J].生物化学与生物物理进展,1999(1)
[22]  Ruda T. A;Dutta P. K,Fenton chemistry of Fe^Ⅲ-exchanged zeolitic minerals treated with antioxidants,Environmental Science and Technology,2005(16).

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