CoO/SrTiO_3的合成及光催化分解水制氢性能

Synthesis and Properties of CoO/SrTiO_3 for the Photocatalytic Decomposition of Water

通过添加碱金属化合物矿化剂，以 Sr(NO_3)_2和钛酸四丁酯的水解产物 TiO(OH)_2为原料进行固态反应，制得结晶完整性较好的 SrTiO_3粉末．再由浸渍法负载 CoO，制备出光催化分解水催化剂 CoO/SrTiO_3，在400W高压汞灯照射下，产氢速率可达到480μmol·g cat^(-1)·h^(-1)．SEM、UV-Vis 漫反射光谱表征结果显示，合成 SrTiOa_3时加入 KOH 矿化剂可使固态反应完全，SrTiO_3结晶完整性提高，进而促进其光催化活性提高，确定了适宜的KOH 矿化剂用量为2.0%(w)。

SrTiO3 powder With high crystal perfection was synthesized by solid-state reaction of strontium nitrate with TiO (OH)2 formed by hydrolysis of tetra-butoxy titanium in the presence of alkali metal compound mineralizer. Then a photocatalyst, CoO/SrTiO3, Was prepared by impregnation method. The effect of the mineralezers is decreased in the following order: KOH > NaOH > NaNO3 > KNO3. The photocatalytic activity of CoO/SrTiO3, was increased for ca. 8 times when KOH mineralizer was added, with the irradiation of 400 W high-pressure mercury lamp, the hydrogen-generation rate amounts to 480 mumol . g cat(-1) . h(-1) over the CoO/SrTiO3, catalyst. Characterization results from SEM and UV-Vis diffuse reflection spectra analysis show that the solid-state reaction for synthesizing SrTiO3 proceeds completely and the crystal perfection of SrTiO3 is improved by adding KOH mineralizer. The suitable amount of KOH is 2.0% (w).