The influence of cyanuric acid (CA) on the structural, textural, electronic, morphological properties and the photocatalytic activity of titanium dioxide materials (TNCA) were herein evaluated. TNCAs samples were prepared through the sol gel method. The novelty of this work that cyanuric acid; the so far most recalcitrant molecule, is used here as reservoir of nitrogen. The synthesis of TNCAs nanomaterials are performed at low temperature in presence of quaternary ammonium as co-catalyst for anatase growth. Samples were characterized by means of nitrogen adsorption-desorption isotherms at 77 K, X-ray diffraction (XRD), Infrared (ATR), Raman, diffuse reflectance ultraviolet-visible, photoluminescence (PL) and electron paramagnetic resonance (EPR) spectroscopies, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The photocatalytic activities of TNCAs and their free counterpart nanomaterials were then evaluated in the photocatalytic degradation of formic acid (FA) as model molecule under UV.

X-ray and Raman show success of anatase phase formation at low temperature without any post-calcination. IR-ATR analysis confirms CA grafting onto TiO₂ identified by formation of vibration band between Ti and triazine. SEM mapping shows that C, O, Ti, and N are homogeneously distributed in the nanomaterial. Nitrogen adsorption-desorption measurements at 77 K show developed textural properties; the heat of N₂ adsorption seems to be affected by CA loading. PL and UV-visible spectroscopies show simultaneously (i) electron trapping by the oxygen vacancy identified by Raman spectroscopy by redshift of Eg1 mode and (ii) the hole is confined by nitrogen. Therefore, the excited electron can move from TiO₂ VB to the new sublevels initiated by the introduction of nitrogen which results in quenching of the photoluminescence intensity. The photocatalytic activity of the various TNCAs nanomaterials increases versus CA loading. The highest k_LH of TNCA2 (5 wt%) could be explained by short migration time conjugated with lower bulk recombination of the photogenerated electron hole.

本文评估了氰尿酸（CA）对二氧化钛材料（TNCA）的结构，质构，电子，形态和光催化活性的影响。TNCA样品通过溶胶凝胶法制备。这项工作的新颖之处在于氰尿酸；到目前为止，最顽强的分子在这里用作氮的储存库。TNCAs纳米材料的合成是在季铵盐作为锐钛矿生长助催化剂的低温下进行的。通过在77 K下的氮吸附-解吸等温线，X射线衍射（XRD），红外（ATR），拉曼，紫外可见漫反射，光致发光（PL）和电子顺磁共振（EPR）光谱，扫描等对样品进行表征电子显微镜（SEM）和透射电子显微镜（TEM）。

X射线和拉曼显示出在没有任何后煅烧的情况下在低温下成功形成了锐钛矿相。IR-ATR分析证实了CA接枝到TiO _{2上，这是}通过在Ti和三嗪之间形成振动带来确定的。扫描电镜图显示，碳，氧，钛和氮均匀分布在纳米材料中。氮在77 K时的吸附-解吸测量显示出发达的组织特性；N ₂吸附的热量似乎受CA负载的影响。PL和紫外可见光谱同时显示（i）通过Eg1模式的红移通过拉曼光谱法鉴定的氧空位捕获电子，以及（ii）空穴被氮限制。因此，激发电子可以从TiO _2中移出VB由引入氮引发的新子级引起，这导致了光致发光强度的猝灭。各种TNCAs纳米材料的光催化活性相对于CA负载增加。TNCA2的最高k _LH（5 wt％）可以用迁移时间短和光生电子空穴的较低本体重组相结合来解释。