In present paper pure and Ni-N-codoped TiO₂ nanoparticles have been synthesized via sol gel technique. Crystal phase formation of as synthesized nanoparticles was determined from x-ray diffraction which confirms the existence of anatase phase of TiO₂. The average crystalline size was determined from x-ray diffraction and estimated from Transmission Electron Micrographs found to vary from 24.8 nm to 10.2 nm. The morphology was studied by Field Emission Scanning Electron Microscopy and reveals that the synthesized nanoparticles are highly crystalline, spherical and small agglomerated. It is observed that on doping the agglomeration decreases and is due to relative rates of growth process. The band gap energy was calculated from UV–visible absorption spectroscopy and found to be 3.12, 1.81, 1.69 and 1.53 eV respectively. The appearance of emission bands at 453, 470, 483 and 494 nm in Photoluminescence spectra could be arising from defect energy states caused by oxygen vacancies within the forbidden region of TiO₂.The structural formation of the synthesized nanoparticles is investigated from Fourier-transform-infrared and Energy dispersive x-ray spectroscopy measurements. Photocatalytic degradation efficiency of as synthesized nanoparticles against two different dyes (Congo red and Methyl orange) was investigated under visible light source of wavelength 420–520 nm and is found to increase with dopant concentration (x). It is observed that the increase in Photocatalytic degradation efficiency of synthesized nanoparticles is attributed to decrease in carrier recombination rate arises from the decrease in band gap energy. On the basis of these observations it is concluded that the increase in Photocatalytic activity is due to increase in surface area arises from the decrease in average crystalline size of the synthesized nanoparticles.

在本文中，通过溶胶凝胶技术合成了纯的和 Ni-N 共掺杂的 TiO ₂纳米粒子。X 射线衍射确定合成纳米颗粒的晶相形成，这证实了 TiO ₂锐钛矿相的存在. 平均晶体尺寸由 X 射线衍射确定，并从透射电子显微照片估计，发现在 24.8 nm 至 10.2 nm 之间变化。通过场发射扫描电子显微镜研究了形态，表明合成的纳米颗粒是高度结晶的、球形的和小的团聚体。据观察，在掺杂时，团聚减少并且是由于生长过程的相对速率。带隙能量由紫外可见吸收光谱计算得出，分别为 3.12、1.81、1.69 和 1.53 eV。光致发光光谱中 453、470、483 和 494 nm 发射带的出现可能是由 TiO ₂禁区内氧空位引起的缺陷能态引起的.通过傅立叶变换红外和能量色散 X 射线光谱测量研究合成纳米颗粒的结构形成。在波长 420-520 nm 的可见光源下研究了合成纳米粒子对两种不同染料（刚果红和甲基橙）的光催化降解效率，发现随着掺杂浓度（x）。据观察，合成纳米粒子的光催化降解效率的增加归因于载流子复合率的降低，这是由于带隙能量的降低引起的。基于这些观察结果得出结论，光催化活性的增加是由于表面积增加引起的合成纳米颗粒的平均晶体尺寸的减小。