Hydrophilic and photocatalytic activities of Nd-doped titanium dioxide thin films  

钕掺杂氧化钛薄膜的亲水和光催化性能（英文）

作　　者：杜军[1] 顾馨[1] 吴其[1] 刘娇[1] 郭海志 邹建国[1] 

机构地区：[1]南昌大学环境与化学工程学院鄱阳湖生态与资源再利用教育部重点实验室,南昌330031

出　　处：《Transactions of Nonferrous Metals Society of China》2015年第8期2601-2607,共7页中国有色金属学报（英文版）

基　　金：Projects(51162022,21201098)supported by the National Natural Science Foundation of China;Project(GJJ14126)supported by Jiangxi Provincial Education Department,China;Project(2012019)supported by the Test Foundation of Nanchang University,China

摘　　要：The Nd-doped TiO2 thin films with higher hydrophilic and photocatalytic activities were prepared on glass slides by an acid-catalyzed sol？gel method. The effects of Nd doping on crystalline phase, surface composition and optical property were investigated by means of techniques such as X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, Fourier transform infrared spectroscopy （FT-IR）, optical contact angle tester and UV-Vis spectroscopy. The results show that Nd doping obviously influences the hydrophilic and photocatalytic activities of TiO2thin films. Nd doping could cause the TiO2 lattice distortion, inhibit phase transition from anatase to rutile, cause red shift of the absorption spectrum edge, produce hydroxyl radicals （·OH）, and accelerate surface hydroxylation, which result in a significant improvement in the hydrophilicity and photoreactivity of Nd-doped TiO2 thin films. When the content of Nd is 0.1% （mass fraction）, TiO2 thin films achieve the smallest grain size （about 15 nm）, and the hydrophilic and photocatalytic activities of TiO2 thin film reach the maximum, the contact angle is only 8.1°, and 92% of methylene blue is finally degraded. Moreover, the modification mechanism of Nd doping was also discussed.通过酸催化溶胶-凝胶法在玻璃基板上制备具有高亲水性和光催化活性的Nd掺杂TiO_2薄膜。用XRD、SEM、TEM、FT-IR、光学接触角测量仪和紫外可见分光光度计研究Nd掺杂对薄膜的晶体结构、组成和光学性能的影响。结果表明,Nd掺杂对薄膜的亲水性和光催化性能有重要影响。Nd掺杂导致TiO_2晶格变形,抑制氧化钛由锐钛矿相向金红石相转变、紫外吸收光谱的红移,产生大量氢氧自由基(·OH)并加速表面的羟基化反应。当Nd掺杂量为0.1%(质量分数)时,薄膜颗粒尺寸最小,约为15 nm,薄膜的亲水性能最佳,接触角仅为8.1°,且92%的亚甲基蓝被光催化分解。此外,对Nd掺杂的改性机理进行讨论。

关 键 词：Nd doping sol-gel method HYDROPHILICITY PHOTOCATALYSIS 

分 类 号：O614.411[理学—无机化学] TB383.2[理学—化学]