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采用新的化学溶液法,通过不同体积的钛酸四异丙酯的2-乙二醇单乙醚溶液与一定浓度的H2O2水溶液直接反应并对生成的钛过氧化配合物进行焙烧,制备了一系列TiO2光催化剂.表征发现,所得TiO2样品为金红石和锐钛矿的纳米复合晶体,改变2-乙二醇单乙醚的体积可实现金红石相比例在0～96%广范围的调变.与商业二氧化钛P-25相比,所得的TiO2紫外-可见光吸收谱出现明显红移,间隙能降低,在可见光照射下,该样品对亚甲基蓝有良好的降解活性.当2-乙二醇单乙醚的添加量为5ml时,所得样品体相中金红石相比例接近50%,其光催化活性和吸附性能最好,可分别是P-25的3倍和5倍.拉曼光谱结合X射线衍射等表征结果表明,该样品的表面仅含少量的金红石相.TiO2纳米复合晶表面晶相的组成和分布对其光催化降解亚甲基蓝的活性及其吸附能力有直接的影响.另外,TiO2纳米复合晶的缺陷浓度也是增强其光吸收能力,提高其可见光光催化活性的原因之一.
Using a new chemical solution method, different volumes of tetraisopropyl titanate 2-ethylene glycol monoethyl ether solution and a certain concentration of aqueous solution of H2O2 direct reaction and the resulting titanium peroxide complex calcined to prepare a series of TiO2 photocatalyst. Characterization found that the resulting TiO2 sample is a rutile and anatase nanocomposite crystal, changing the volume of 2-ethylene glycol monoethyl ether can achieve a wide range of 0 to 96% modulation of the rutile phase.Compared with commercial Titanium dioxide P-25 compared to the resulting UV-visible absorption spectra of the apparent red shift, the gap can be reduced under visible light irradiation, the sample methylene blue has good degradation activity when the amount of 2-ethylene glycol monoethyl ether 5ml, the photocatalytic activity and adsorption performance of the obtained sample phase are nearly 50%, which are 3 times and 5 times that of P-25, respectively. The results of Raman spectroscopy and X-ray diffraction indicate that , The surface of the sample contains only a small amount of rutile phase.The composition and distribution of the crystal phase on the surface of the TiO 2 nanocomposite have a direct effect on the photocatalytic degradation of methylene blue and its adsorption capacity.In addition, the defect concentration of TiO 2 nanocomposite One reason is to enhance the light absorption capacity, improved visible light photocatalytic activity.