采用控制水解法制备了细颗粒的ZrO2/Ta2O5复合氧化物粉体,在氨气流量为90 mL/min、850℃下氮化10 h获得ZrO2/TaON,用浸渍法制备含助催化剂RuO2的复合光催化剂。用XRD、SEM、TEM和UV-Vis漫反射光谱等对所制备的光催化材料进行了表征, ZrO2、RuO2的晶粒尺寸约为10 nm，TaON的晶粒尺寸约为25 nm,复合光催化剂可以吸收波长≤500 nm的可见光。ZrO2的引入降低了氮化生成TaON的缺陷密度,提高了TaON的比表面积。光电流及光催化分解水制氢反应定量评价了复合材料的光催化性能, RuO2含量为2.0wt%时复合光催化剂活性最高,0.6 V偏压下光电流密度为0.6 mA/cm2,产氢速率为6.0mmol/h。
ZrO2/Ta2O5 composite oxide powders in a fine particle size were prepared by the controlled hydrolysis method, and subsequently nitrided in a flowing ammonia at a flow rate of 90 mL/min at 850℃ for 10 h, to form ZrO2/TaON. Then, RuO2 co-catalyst was immobilized on the ZrO2/TaONvia an impregnation method. The samples were characterized with XRD, SEM, TEM and UV-Vis diffuse reflectance spectroscope. Both ZrO2 and RuO2 were in a crystallite size ofca. 10 nm, while TaON was in a crystallite size ofca.25 nm, and composite photocatalysts ab-sorbed the visible light at wavelength less than 500 nm. The introducing of ZrO2 reduced the defect density of TaON and increased the specific surface area of TaON. The photocatalytic efficiency of composite photocatalysts was quan-titatively evaluatedvia determining the photo-current density as well as in the water splitting hydrogen evolution reac-tion. The sample with a RuO2 loading of 2.0wt% showed the photocurrent of 0.6 mA/cm2 at a bias voltage of 0.6 V, and H2 evolution rate as high as 6.0mmol/h under a Xe lamp irradiation.
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