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通过引入十八烷基三氯硅烷(OTS)自组装单分子膜作为氧化反应的探针,在排除反应物的吸附和扩散的条件下研究溶胶-凝胶制备的TiO2薄膜表面光催化空(氧化初始过程.研究结果表明,在紫外光照下,水溶液中OTS部分覆盖的TiO2表面能够很快从憎水变成亲水.存在空(捕获剂后,TiO2表面OTS自组装单分子膜碳链的脱除受到明显抑制,水接触角随光照时间变化非常小;而水中羟基自由基捕获剂或者F-的存在则对TiO2表面OTS自组装单分子膜碳链的脱除几乎无影响.这表明,空(氧化在TiO2表面OTS自组装单分子膜碳链的脱除中占主要地位.
By introducing octadecyltrichlorosilane (OTS) self-assembled monolayer as a probe for oxidation reaction, the photocatalytic oxidation of TiO2 film on sol-gel was studied under the condition of eliminating the adsorption and diffusion of reactants The results show that the surface of TiO2 covered by OTS in aqueous solution can quickly change from hydrophobic to hydrophilic under ultraviolet light, and the existence of empty (after the capture agent, the removal of OTS self-assembled monolayer carbon chains on TiO2 surface The water contact angle changed little with the illumination time while the presence of hydroxyl radical scavenger or F- in water had almost no effect on the removal of OTS self-assembled monolayer carbon chains on the surface of TiO 2. Oxidation plays a major role in the removal of OTS self-assembled monolayer carbon chains on TiO2 surface.