微弧氧化法制备硫离子掺杂TiO_2薄膜及光催化制氢性能研究

Photocatalytic Production of Hydrogen over S doped TiO2Photocatalysts Prepared by Micro-arc Oxidation Technique

以Na2SO3作为硫源,采用微弧氧化法法制备了硫离子掺杂TiO2薄膜(S-TiO2),利用XRD、UV-Vis、SEM和XPS等测试手段对上述催化剂进行了表征。分析结果表明,TiO2膜层只生成单一相的锐钛矿,并没有发现金红石相TiO2的特征峰;TiO2膜层的晶相组成及表面形貌没有受到硫源加入的影响;S离子掺杂后TiO2薄膜的吸收边发生红移,表明薄膜对可见光有一定的响应。Na2SO3添加浓度为0.03mol/L时,制备的S-TiO2光催化产氢速率达到0.279μmol/cm2·h。

The S doped TiO2 film catalysts （S-TiOE） were prepared using Na2O3 as S source by micro-arc oxidation （MAO） technique. The above-prepared S-TiO2 was characterized by XRD, UV-Vis, XPS and SEM. The XRD results revealed that the anatase structure peaks were only found in the pattern of S-TiO2, which was good for photocatalytie reaction. The crystalline structure and surface appearance of TiO2 film had no obvious changes with the change of Na2SO3 concentration in electrolyte. The absorption edge of S-TiO2 had a red shift which was observed in the UV-Vis absorption spectra, and it indicated that the film had certain response to visible light. The results of photoeatalytic production of H2 showed that the production rate of H2 was 0.279umol/cm2·h over S-TiO2 which was prepared with Na2SO3 with a concentration of 0.03mol/L.