We present hydrothermal fabrication of hydroxyl group-rich mixed-phase TiO₂ nanoflowers (surface area ~ 252 m²/g) (MTNF) and their tremendous sunlight-induced photodegradation nature for methylene blue (MB), methyl orange (MO), rhodamine 6G (R6G), and oxytetracycline hydrochloride (OTC-HCl) molecules. The morphology of MTNF has been confirmed through the transmission electron microscope and scanning electron microscope studies. Microscopy studies reveal that each flower-like nanostructures formed by the assembly of nanoflakes. X-ray diffraction and Raman studies confirm the presence of mixed (anatase/rutile) phase of TiO₂. The optical behavior of MTNF is explored by the UV-visible diffuse reflectance spectroscopy (UV-DRS) and photoluminescence spectroscopy (PL). Urbach energy calculation indicates the appearance of oxygen-related defects which are further assured by the PL studies. Existence of the hydroxyl group over the surface of MTNF is confirmed through Fourier transform infrared spectroscopy studies. Adsorption study results show the higher tendency of MTNF to adsorb the MB dye molecules as compared to R6G and MO dye molecules due to the presence of hydroxyl group and effective high surface area. Sunlight-driven photodegradation activity of MTNF was demonstrated by the decoloration of MB, MO, R6G, and OTC-HCl solution. Hydroxyl group functionalized MTNF with effective surface area decomposes the 16 µM MB, 10 µM MO, 10 µM R6G, and 0.5 mg/mL OTC-HCl molecules in just 12 min, 40 min, 30 min, and 60 min, respectively. Sunlight-induced photodegradation activity of MTNF can be attributed to the combined feature of hydroxyl radicals and synergistic effects in the TiO₂ nanoflower-like structures.

我们提出了富含羟基的混合相TiO ₂纳米花（表面积〜252 m ² / g）（MTNF）的水热制备及其对亚甲基蓝（MB），甲基橙（MO），若丹明的巨大阳光诱导的光降解性质。 6G（R6G）和盐酸土霉素（OTC-HCl）分子。通过透射电子显微镜和扫描电子显微镜研究已经证实了MTNF的形态。显微镜研究表明，每种花状纳米结构都是由纳米薄片组装而成的。X射线衍射和拉曼研究证实了TiO ₂混合（锐钛矿/金红石）相的存在。MTNF的光学行为是通过紫外可见漫反射光谱（UV-DRS）和光致发光光谱（PL）来探索的。Urbach能量计算表明出现了与氧有关的缺陷，PL研究进一步保证了这种缺陷的出现。通过傅立叶变换红外光谱研究证实了MTNF表面上羟基的存在。吸附研究结果表明，由于存在羟基和有效的高表面积，与R6G和MO染料分子相比，MTNF吸附MB染料分子的趋势更高。MB，MO，R6G和OTC-HCl溶液的脱色证明了MTNF在阳光驱动下的光降解活性。具有有效表面积的羟基官能化MTNF分解了16 µM MB，10 µM MO，10 µM R6G和0。在12分钟，40分钟，30分钟和60分钟内分别获得5 mg / mL OTC-HCl分子。MTNF在阳光下诱导的光降解活性可归因于TiO2的羟基自由基和协同效应的组合特征₂纳米花状结构。