N-TiO_2/PSF中空纤维复合膜光催化烟气脱硝研究
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摘要
采用溶胶-凝胶法以聚砜(PSF)中空纤维膜为载体制备了N-Ti O2/PSF中空纤维复合膜催化剂,考察其光催化烟气脱硝性能.紫外光催化的NO去除效率可达63%,去除负荷可达213.6 g·m-3·h-1.采用紫外-可见光谱(UV-Vis)、X-射线光电子能谱(XPS)和傅里叶变换红外光谱(FTIR)表征了N-Ti O2/PSF中空纤维复合膜催化剂.UV-Vis光谱分析表明,掺杂N改性的Ti O2复合膜光催化层在紫外和可见光波段的吸收性能都有极大的改善.XPS证明了O—Ti—N键能的存在.N-Ti O2/PSF中空纤维膜光催化处理NO的作用机制为NO气体通过中空纤维膜传质到NTi O2催化膜,光催化产生羟基自由基和超氧负离子,NO气体被羟基自由基和超氧负离子氧化成易处理的NO2和HNO3.
The N-doped titanium dioxide( N-Ti O2) was prepared by thesol-gel method and was loaded on polysulfone( PSF) hollow fiber membrane. It was used for the treatment of NOxunder the UV irradiation. NO removal efficiency was up to 63% and the maximum elimination capacity reached 213.6mg·m-3·h-1. UV-Vis spectra,X-ray photoelectron spectroscopy( XPS),and Fourier Transform Infrared Spectrometer( FT-IR) were used to characterize the prepared N-Ti O2/ PSF. The UV-vis spectra results showed that N-Ti O2 increased the absorption capacity of UV and visible band. XPS proved the presence of O—Ti—N. NO was diffused from the gas phase to the surface of the N-Ti O2,and then oxidized into NO2 and HNO3by strong oxidant hydroxyl radical and O-2.
The N-doped titanium dioxide( N-Ti O2) was prepared by thesol-gel method and was loaded on polysulfone( PSF) hollow fiber membrane. It was used for the treatment of NOxunder the UV irradiation. NO removal efficiency was up to 63% and the maximum elimination capacity reached 213.6mg·m-3·h-1. UV-Vis spectra,X-ray photoelectron spectroscopy( XPS),and Fourier Transform Infrared Spectrometer( FT-IR) were used to characterize the prepared N-Ti O2/ PSF. The UV-vis spectra results showed that N-Ti O2 increased the absorption capacity of UV and visible band. XPS proved the presence of O—Ti—N. NO was diffused from the gas phase to the surface of the N-Ti O2,and then oxidized into NO2 and HNO3by strong oxidant hydroxyl radical and O-2.
引文
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Chen X F,Wang X C,Hou Y D,et al.2008.The effect of postnitridation annealing on the surface property and photocatalytic performance of N-doped TiO 2under visible light irradiation[J].Journal of Catalysis,255(1):59-67
De Melo J S,Trichês G,Gleize P J P,et al.2012.Development and evaluation of the efficiency of photocatalytic pavement blocks in the laboratory and after one year in the field[J].Construction and Building Materials,37:310-319
Hashimoto K,Wasada K,Osaki M,et al.2001.Photocatalytic oxidation of nitrogen oxide over titania-zeolite composite catalyst to remove nitrogen oxides in the atmosphere[J].Applied Catalysis B:Environmental,30(3/4):429-436
Hauchecorne B,Tytgat T,Terrens D,et al.2010.Validation of a newly developed FTIR in situ reactor:Real time study of photocatalytic degradation of nitric oxide[J].Infrared Physics&Technology,53(6):469-473
Irie H,Watanabe Y,Hashimoto K.2003.Nitrogen-concentration dependence on photocatalytic activity of TiO 2-xNxpowders[J].The Journal of Physical Chemistry B,107(23):5483-5486
Li L D,Shen Q,Cheng J,et al.2010.Catalytic oxidation of NO over TiO 2supported platinum clusters.II:mechanism study by in situ FTIR spectra[J].Applied Catalysis B,158(3/4):361-369
Livraghi S,Paganini M C,Giamello E,et al.2006.Origin of photoactivity of nitrogen-doped titanium dioxide under visible light[J].Journal of the American Chemical Society,128(49):15666-15671
Nakamura R,Tanaka T,Nakato Y.2004.Mechanism for visible light responses in anodic photocurrents at N-doped TiO 2film electrodes[J].The Journal of Physical Chemistry B,108(30):10617-10620
Pitoniak E,Wu C Y,Mazyck D W,et al.2005.Adsorption enhancement mechanisms of silica-titania nanocomposites for elemental mercury vapor removal[J].Environmental Science&Technology,39(5):1269-1274
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Sathish M,Viswanathan B,Viswanath R P,et al.2005.Synthesis,characterization,electronic structure,and photocatalytic activity of nitrogen-doped TiO 2nanocatalyst[J].Chemistry of Materials,17(25):6349-6353
Su C Y,Ran X,Hu J L,et al.2013.Photocatalytic process of simultaneous desulfurization and denitrification of flue gas by TiO 2-polyacrylonitrile nanofibers[J].Environmental Science&Technology,47(20):11562-11568
孙墨杰,姜佳旭,于大禹.2012.基于反硝化菌的烟气脱硝技术研究进展[J].化工进展,31(6):1179-1183
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Wang Y Q,Yu X J,Sun D Z.2007b.Synthesis,characterization,and photocatalytic activity of TiO 2-xNxnanocatalyst[J].Journal of Hazardous Materials,144(1/2):328-333Wang H Q,Wu Z B,Zhao W R,et al.2007a.Photocatalytic oxidation of nitrogen oxides using TiO 2loading on woven glass fabric[J].Chemosphere,66(1):185-190
Wang Y Q,Yu X J,Sun D Z.2007b.Synthesis,characterization,and photocatalytic activity of TiO 2-xNxnanocatalyst[J].Journal of Hazardous Materials,144(1/2):328-333
Wu Q P,Yang C C,van de Krol R.2014.A dopant-mediated recombination mechanism in Fe-doped TiO 2nanoparticles for the photocatalytic decomposition of nitric oxide[J].Catalysis Today,225:96-101
Wu Z B,Jin R B,Wang H Q,et al.2009.Effect of ceria doping on SO2resistance of Mn/TiO 2for selective catalytic reduction of NO with NH3at low temperature[J].Catalysis Communications,10(6):935-939
辛柏福,井立强,任志宇,等.2004.多价态共存的Ag-TiO 2光催化剂的制备及光催化活性[J].化学学报,62(12):1110-1114
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赵毅,赵莉,韩静,等.2008.TiO 2光催化烟气同时脱硫脱硝方法及其机理研究[J].中国科学E辑:技术科学,38(5):755-763