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Facile method for the selective growth of rice like rutile TiO_2 from peroxotitanate gel and its photo-activity

机译：从过氧钛酸盐凝胶中选择性选择金红石型TiO_2等水稻的方法及其光活性

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摘要

Selective growth of rice like rutile titanium dioxide by hydrothermal method using titanium peroxide gel as a titanium precursor is reported herewith. Influence of synthetic parameters such as reaction time, temperature and pH on the morphology of the resulting nanocrystals has been investigated. To accomplish the monodispersed rice like rutile TiO_2 particles, trifluoroacetic acid is used as a growth regulator. Trifluoroacetic acid plays dual role i.e. to adjust the pH and growth regulator. The crystallinity and crystal size of TiO_2 increases with treatment temperature and time. The pH value of reaction mixture is found to be important for controlling the size, shape and structure of TiO_2. Hydrothermal treatment of peroxotitanate gel gives anatase TiO_2 with spherical like granular morphology but acidic pH by addition of trifluoroacetic acid, favors rice like rutile phase. The TiO_2 obtained was characterized using various instrumental techniques. Accordingly, a possible growth mechanism for the crystallization TiO_2 has been proposed. Suitability of TiO_2 photocatalyst is tested for the degradation of phenol under UV light and the results were compared with standard Degussa P-25 TiO_2. Surprisingly, the rice like rutile TiO_2 exhibit higher photo-activity than P-25 TiO_2.
机译：据报道，使用过氧化钛凝胶作为钛前体，通过水热法选择性地生长了金红石型二氧化钛等大米。研究了合成参数，例如反应时间，温度和pH对所得纳米晶体形态的影响。为了完成像金红石TiO_2颗粒一样的单分散大米，三氟乙酸被用作生长调节剂。三氟乙酸起着双重作用，即调节pH和生长调节剂。 TiO_2的结晶度和晶体尺寸随着处理温度和时间的增加而增加。发现反应混合物的pH值对于控制TiO 2的尺寸，形状和结构很重要。过氧钛酸盐凝胶的水热处理得到具有球形球形颗粒形状的锐钛矿型TiO_2，但通过加入三氟乙酸使pH呈酸性，有利于像金红石相的大米。使用各种仪器技术对获得的TiO_2进行了表征。因此，已经提出了结晶TiO_2的可能的生长机理。测试了TiO_2光催化剂在紫外光下苯酚降解的适用性，并将结果与​​标准Degussa P-25 TiO_2进行了比较。令人惊讶的是，像金红石型TiO_2这样的大米比P-25 TiO_2具有更高的光活性。

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