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将纳米TiO2粉体分散在钛酸四丁酯中制成纳米TiO2胶体溶液,在ITO上涂膜烧结制成纳米TiO2薄膜电极。利用循环伏安法发现纳米TiO2薄膜电极表面有.OH产生,并进一步利用电子自旋共振(ESR)谱来检测.OH的产生情况。得到在自然光下,纳米TiO2薄膜电极吸收紫外光能量后产生了空穴(h+),与吸附在电极表面的水分子反应产生.OH。通过降解甲醛的实验,初步验证了.OH光催化降解甲醛的机理。
The nano-TiO2 powder is dispersed in tetrabutyl titanate to make a nano-TiO2 colloidal solution, and is coated on ITO to form a nano-TiO2 film electrode. The formation of .OH on the surface of nanocrystalline TiO2 thin films was detected by cyclic voltammetry. The electron spin resonance (ESR) spectra were further used to detect the generation of .OH. Under natural light, the hole (h +) is generated after the nano-TiO2 film electrode absorbs the ultraviolet energy and reacts with water molecules adsorbed on the surface of the electrode to generate .OH. Through the experiment of degradation of formaldehyde, the mechanism of photocatalytic degradation of formaldehyde by OH was preliminarily verified.