Herein, we report the collection of TiO₂ nanopowder after successful thin film deposition. The obtained TiO₂ nanopowder was utilized for photodegradation of 4-nitrophenol (4-NP). The structural, optical, morphological, thermal and photocatalytic properties of TiO₂ photocatalyst were systematically studied using XRD, Raman, HR-TEM, FT-IR, FE-SEM, EDS, UV–Vis, DRS, PL, BET and TGA. From XRD, we correlate crystallinity parameters like crystallite domain size, lattice cell parameters, unit cell volume, microstrain, stacking fault and dislocation density. TiO₂ nanopowder annealed at 400 °C shows the anatase phase which is confirmed by Raman and XRD analyses. In addition, optical results indicate that the absorption band edge is positioned in the UV region with bandgap energy of 3.03 eV. The FE-SEM and TEM images of TiO₂ nanopowder show irregular spherical morphology which results in the aggregation of nanoparticles with a mean diameter of 27 nm. From Brunauer–Emmett–Teller (BET) adsorption isotherm, the surface area was obtained to be 38 m²/g. The TGA curve demonstrates the thermodynamically stable anatase phase of TiO₂ photocatalyst appeared in the 350–750 °C. Under UV light irradiation, photodegradation of 4-NP over 1.5 g/dm³ TiO₂ photocatalyst dose achieved an excellent degradation efficiency and COD removal efficiency around 99.51 and 82% within 80 min, respectively. From trapping experiments, it indicates that OH^· and O₂^· radicals are major reactive oxygen species involved in the photodegradation of 4-NP.

在这里，我们报告成功沉积薄膜后TiO ₂纳米粉的收集。将获得的TiO ₂纳米粉用于4-硝基苯酚（4-NP）的光降解。使用XRD，拉曼，HR-TEM，FT-IR，FE-SEM，EDS，UV-Vis，DRS，PL，BET和TGA对TiO ₂光催化剂的结构，光学，形态，热和光催化性能进行了系统研究。通过XRD，我们可以关联结晶度参数，例如微晶畴尺寸，晶格参数，晶胞体积，微应变，堆垛层错和位错密度。二氧化钛₂在400°C退火的纳米粉末显示了锐钛矿相，这已通过拉曼和XRD分析得到了证实。此外，光学结果表明吸收带边缘位于带隙能量为3.03 eV的UV区域中。TiO ₂纳米粉的FE-SEM和TEM图像显示出不规则的球形形态，这导致平均直径为27 nm的纳米粒子聚集。从Brunauer-Emmett-Teller（BET）吸附等温线获得的表面积为38 m ² / g。TGA曲线表明TiO ₂光催化剂的热力学稳定的锐钛矿相在350–750°C下出现。在紫外线下，在1.5 g / dm ³ TiO ₂上光降解4-NP在80分钟内，光催化剂剂量的降解效率和COD去除率分别达到99.51和82％。通过诱捕实验表明，OH ^·和O ₂ ^·自由基是参与4-NP光降解的主要活性氧。