CAJ | 학술논문

采用溶胶-凝胶法和四丁基氢氧化铵( TBAH )表面改性的方法制备出改性 TiO2光催化剂( TBAH-TiO2).利用X射线衍射谱( XRD)、X射线光电子能谱( XPS)、透射电子显微镜( TEM)、傅里叶变换红外光谱( FTIR)和表面光电压谱( SPS)等表征了催化剂的晶体结构、晶粒粒径和能带结构,并研究了其光催化活性.研究结果表明, TBAH-TiO2催化剂的表面主要存在NOx(x=1,2,3)物种,该物种能级(价带上0.20 eV)产生了可见光响应,有效地促进了光生电子和光生空穴的分离,使催化剂的可见和紫外光催化活性显著提高, TBAH-TiO2催化剂降解对氯苯酚的可见光和紫外光催化活性分别是TiO2的2.6倍和1.7倍.
채용용효-응효법화사정기경양화안( TBAH )표면개성적방법제비출개성 TiO2광최화제( TBAH-TiO2).이용X사선연사보( XRD)、X사선광전자능보( XPS)、투사전자현미경( TEM)、부리협변환홍외광보( FTIR)화표면광전압보( SPS)등표정료최화제적정체결구、정립립경화능대결구,병연구료기광최화활성.연구결과표명, TBAH-TiO2최화제적표면주요존재NOx(x=1,2,3)물충,해물충능급(개대상0.20 eV)산생료가견광향응,유효지촉진료광생전자화광생공혈적분리,사최화제적가견화자외광최화활성현저제고, TBAH-TiO2최화제강해대록분분적가견광화자외광최화활성분별시TiO2적2.6배화1.7배.
Tetrabutyl ammonium hydroxide modified TiO2 photocatalyst( TBAH-TiO2 ) was prepared by a sol-gel method and surface modification method with tetrabutyl ammonium hydroxide ( TBAH ) . The structure, crystallite size and energy levels of the photocatalysts were studied by X-ray diffraction( XRD) , X-ray photoe-lectron spectroscopy ( XPS ) , transmission electron microscopy ( TEM ) , Fourier transform infrared ( FTIR ) spectroscopy and surface photovoltaic spectroscopy ( SPS ) . The experimental results of 4-chlorophenol photo-catalytic degradation showed that TBAH-TiO2 exhibited a better photocatalytic activity than TiO2 . Its photocat-alytic efficiency is 2. 6 and 1. 7 times as high as that of pure TiO2 under visible light and ultraviolet light, re-spectively. The results reveal that NOx(x=1, 2 and 3) species that exist on the surface of the TBAH-TiO2 catalyst introduce the energy level of surface states 0. 20 eV above the valence band. This energy level not only makes the catalyst responsible to visible light but also promotes the separation of photogenerated carriers. Thus, the activities under ultraiolet light and visible light irradiations are increased.