Abstract Titanium dioxide nanoparticles were synthesized by hydrolyzing titanium tetrachloride (TiCl4) in a controlled manner using a homemade glass apparatus. The structural properties and chemical composition were studied using X-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, Brunauer-Emmett-Teller surface area analysis, selected area electron diffraction, energy dispersive spectroscopy, and X-ray photoelectron spectroscopy. The X-ray diffraction pattern and the high-resolution transmission electron microscope analyses confirmed that the TiO2 nanoparticles are composed of photo-active anatase and brookite phases. The photocatalytic activity of the TiO2 nanoparticles was demonstrated by photo-degradation of methylene blue and congo red under UV–Vis light illumination. Studying how pH affects the degradation of methylene blue revealed that its photocatalytic degradation on TiO2 nanoparticles is more efficient under alkaline conditions, whereas the congo red degradation is more efficient under acidic conditions.

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TiO2纳米粒子的可控合成及其光催化降解染料活性

摘要 使用自制的玻璃装置以可控方式水解四氯化钛 (TiCl4) 合成了二氧化钛纳米颗粒。使用 X 射线衍射、透射电子显微镜、高分辨率透射电子显微镜、Brunauer-Emmett-Teller 表面积分析、选区电子衍射、能量色散光谱和 X 射线光电子能谱研究了结构性质和化学成分。X 射线衍射图和高分辨率透射电子显微镜分析证实，TiO2 纳米颗粒由光敏锐钛矿相和板钛矿相组成。TiO2 纳米颗粒的光催化活性通过在紫外-可见光照射下对亚甲蓝和刚果红进行光降解来证明。