Ti-天然沸石的钛掺杂取代法制备、表征和光催化性能

以酸处理脱铝后信阳天然斜发沸石为载体,硫酸钛、钛酸正丁酯和四氯化钛为钛源,分别采用浸渍法和气相法制备出钛掺杂沸石光催化剂。采用X-射线衍射和傅立叶红外光谱分析了沸石酸处理及钛取代前后结构。结果表明,80℃下,4 mol/L盐酸处理10 h后沸石结构发生了显著变化,但仍保持Al-O-Si骨架结构。红外光谱结果证明Ti4+与沸石形成稳定的Ti-O-Si键。在以300 W紫外灯为光源进行罗丹明B脱色反应,考察了含钛沸石的光催化活性。初始浓度为80 mg/L,光照1.5 h后罗丹明B的去除率为98.18%。

Preparation,characterization and photocatalytic performance of Ti-doped natural zeolite

Ti-doped zeolite photocatalysts were prepared by impregnation and gas deposition methods,with titanium sulfate,tetrabutyl titanate and titanium tetrachlorite as precursors.The natural clinoptilolite from Xinyang was employed as substrate after dealuminating with hydrochloric acid.Morphology and structure of samples were characterized by X-ray diffraction and infrared spectroscopy techniques.Remarkable change in structure of natural zeolite was observed after treated with 4 mol/L HCl at 80 ℃ for 10 h,the framework of Al-O-Si was not destroyed.FT-IR spectra results indicated that stable bond of Ti-O-Si was formed.Photocatalytic degradation of rhodamine B over Ti-zeolite under 300 W UV was investigated.When the initial mass concentration of rhodamine B solution was 80 mg/L,dosage of catalyst was 10 g/L,illumination was 1.5 h,the removal rate could reach 98.18%.