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以钛酸四丁酯为前驱物制备了碘掺杂TiO2催化剂(I-TiO2),考察了碘掺杂量、水解水量、水解温度和煅烧温度对催化剂物理化学性质与光催化活性的影响。X射线衍射(XRD)结果显示,I-TiO2由锐钛矿相和金红石相组成。在可见光照射下,通过降解水溶液中的苯酚评价了I-TiO2催化剂的光催化性能。结果表明,在水解温度为20℃,水解水量为300 mL,煅烧温度为400℃,碘钛比(摩尔比)为20%的制备条件下,催化剂显示了最优的光催化活性。通过向反应体系中引入自由基捕获剂及降低溶解氧,证实光催化降解苯酚主要由光生空穴或吸附的羟基自由基引发。
The iodine-doped TiO2 catalyst (I-TiO2) was prepared by using tetrabutyl titanate as precursor. The effects of iodine doping amount, amount of hydrolyzed water, hydrolysis temperature and calcination temperature on the physicochemical properties and photocatalytic activity of the catalyst were investigated. X-ray diffraction (XRD) results show that I-TiO2 consists of anatase phase and rutile phase. Under visible light irradiation, the photocatalytic activity of I-TiO2 catalyst was evaluated by the degradation of phenol in aqueous solution. The results showed that the catalyst showed the best photocatalytic activity under the conditions of the hydrolysis temperature of 20 ℃, the amount of hydrolyzed water of 300 mL, the calcination temperature of 400 ℃ and the ratio of iodine to titanium (molar ratio) of 20%. By introducing a radical scavenger into the reaction system and reducing the dissolved oxygen, it was confirmed that photocatalytic degradation of phenol is mainly caused by photogenerated holes or adsorbed hydroxyl radicals.