Anatase TiO₂ was synthesized on Hollow glass spheres (HGS) by a sol–gel method in this work. TiO₂/HGS composite (70% HGS + 30% TiO₂) could be suspended in water to facilitate light absorption, and the particles were readily separated from water since they floated on water surface after treatment. The oxidation state of titanium (Ti⁴⁺) in TiO₂/HGS composite was as same as that in pure TiO₂, while the binding energies of Ti2p_1/2 and Ti2p_3/2 orbitals of TiO₂/HGS had a slight 0.3 eV shift to high energy end. Nano-sized TiO₂ crystals were tightly adhered on HGS surface, while the thickness of TiO₂ film might be several hundred nanometers. The electron–hole pairs formed in TiO₂ had a little longer lifetime than the electron–hole pairs formed in TiO₂/HGS, proven by the photoluminescence intensity of emitted photons. Red 2G azo dye was used to study the degradation activity. The photocatalytic activity of TiO₂/HGS composite was comparable to the activity of pure TiO₂ particles. 81% of the initial Red 2G molecules (Red 2G solution 50 mL, 40 mg/L) were decomposed on TiO₂/HGS composite in 170 min.

在这项工作中，通过溶胶-凝胶法在空心玻璃球 (HGS) 上合成了锐钛矿 TiO ₂。TiO ₂ /HGS 复合物（70% HGS + 30% TiO ₂）可以悬浮在水中以促进光吸收，并且颗粒在处理后漂浮在水面上，因此很容易与水分离。TiO ₂ /HGS复合材料中钛(Ti ⁴⁺ )的氧化态与纯TiO _{2 相同}，而TiO ₂ /HGS的Ti2 p _1/2和Ti2 p _3/2轨道的结合能分别为向高能量端略微移动 0.3 eV。纳米尺寸的TiO ₂晶体紧密粘附在 HGS 表面，而 TiO ₂薄膜的厚度可能为数百纳米。TiO _{2 中}形成的电子-空穴对的寿命比TiO ₂ /HGS 中形成的电子-空穴对的寿命稍长，这由发射光子的光致发光强度证明。红色2G偶氮染料用于研究降解活性。TiO ₂ /HGS复合材料的光催化活性与纯TiO ₂颗粒的活性相当。在 170 分钟内，81% 的初始红色 2G 分子（红色 2G 溶液 50 mL，40 mg/L）在 TiO ₂ /HGS 复合材料上分解。