Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, China.
Photochem Photobiol. 2016 Sep;92(5):651-7. doi: 10.1111/php.12626.
The synthesis of Zn-doped TiO2 nanoparticles by solgel method was investigated in this study, as well as its modification by H2 O2 . The catalyst was characterized by transmission electron microscopy, X-ray diffraction, Brunauer-Emmett-Teller, UV-visible reflectance spectra and X-ray photoelectron spectroscopy (XPS). The results indicated that doping Zn into TiO2 nanoparticles could inhibit the transformation from anatase phase to rutile phase. Zn existed as the second valence oxidation state in the Zn-doped TiO2 . Zn-doped TiO2 that was synthesized by 5% Zn doping at 450°C exhibited the best photocatalytic activity. Then, the H2 O2 modification further enhanced the photocatalytic activity. Zn doping and H2 O2 modifying narrowed the band gap and efficiently increased the optical absorption in visible region. The optimal degradation rate of tetracycline by Zn-doped TiO2 and H2 O2 modified Zn-doped TiO2 was 85.27% and 88.14%. Peroxide groups were detected in XPS analysis of H2 O2 modified Zn-doped TiO2 , favoring the adsorption of visible light. Furthermore, Zn-doped TiO2 modified by H2 O2 had relatively good reusability, exhibiting a potential practical application for tetracycline's photocatalytic degradation.
本研究采用溶胶-凝胶法合成了掺锌 TiO2 纳米粒子，并对其进行了 H2O2 改性。采用透射电子显微镜、X 射线衍射、Brunauer-Emmett-Teller、紫外-可见漫反射光谱和 X 射线光电子能谱（XPS）对催化剂进行了表征。结果表明，掺杂 Zn 可以抑制 TiO2 纳米粒子从锐钛矿相向金红石相的转变。Zn 以二价氧化态形式存在于掺锌 TiO2 中。在 450°C 下，以 5% Zn 掺杂合成的掺锌 TiO2 表现出最佳的光催化活性。然后，H2O2 改性进一步提高了光催化活性。Zn 掺杂和 H2O2 改性缩小了带隙，有效提高了可见光区的光吸收。掺锌 TiO2 和 H2O2 改性的掺锌 TiO2 的四环素最佳降解率分别为 85.27%和 88.14%。H2O2 改性的掺锌 TiO2 的 XPS 分析中检测到过氧化物基团，有利于可见光的吸附。此外，H2O2 改性的掺锌 TiO2 具有较好的可重复使用性，为四环素的光催化降解提供了潜在的实际应用。
