乙二胺溶胶凝胶法氮掺杂TiO_2的光催化研究

以钛酸四丁酯(TBT),乙二胺(EDA)为前驱体,乙醇为溶剂,冰醋酸为抑制剂,采用溶胶-凝胶法制备了N掺杂纳米TiO2光催化剂。通过紫外-可见吸收光谱(UV-Vis)、荧光发射光谱(FES)、X射线衍射光谱(XRD)、X射线光电子能谱(XPS)、和BET比表面分析对其光谱特征、晶相结构、表面组成、比表面积进行了表征,以苯酚为模拟污染物考察了其光催化活性。结果表明:该方法制备的N掺杂纳米TiO2的光谱吸收带发生了明显红移,当EDA/TBT(摩尔比)=1/10及焙烧温度为550℃时,所制备样品对可见光的吸收最强,可见光照射150min苯酚的降解率为34.6%,紫外光照射100min苯酚的降解率达到97.8%。

Photocatalysis of N-doped TiO2 from EDA by Sol-gel Method

Nitrogen-doped visible light respond nano-TiO2 was prepared by sol-gel method with TBT and EDA as forerunner body,ethanol as solvent and glacial acetic acid as inhibitor.It was characterized in crystalline structure,spectrum character,superficial composition and BET through UV-Vis absorption spectrum,fluorescence eradiated spectrum(FES),X-ray diffraction spectrum(XRD),X-ray photoelectron spectrum(XPS) and specific surface area.Phenol as model contaminant,the relations between crystalline structure,red shift degree of adsorption band,photocatalytic activity to UV-Vis light and proportion of EDA/TBT and calcining temperature were investigated.Results indicated that crystal phase of obtained nitrogen-doped TiO2 was anatase and absorption band had red shift obviously.Both proportion of EDA/TBT and calcining temperature had an evident effect on spectral absorption and photocatalytic activity to UV-Vis light of prepared samples.Under the conditions of mol proportion of EDA/TBT 1:10 and calcining temperature 550℃,spectral absorption to visible light by prepared samples was the strongest,with degradation rate of phenol up to 34.6% at illumination of visible light 150min and degradation rate of phenol up to 97.8% at illumination of ultraviolet light 100min.