【作者】 阎建辉； 张丽； 朱裔荣； 唐有根； 杨海华；

【Author】 YAN Jian-hui~(1,2) ZHANG Li~1 ZHU Yi-rong~(1,2) TANG You-gen~1 YANG Hai-hua~(1,2) (1.Department of Chemistry and Chemical Engineering,Hunan Institute of Science and Technology,Yueyang 414000,China;2.School of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China)

【机构】 湖南理工学院化学化工系； 中南大学化学化工学院；

【摘要】 采用固相法制备氮掺杂SrTiO₃,并用浸渍-氢气还原法制备了不同负载量MO/N-SrTiO₃（M= Ni,Co）异质结复合催化剂,采用XRD、SEM、荧光光谱（FS）、紫外可见漫反射光谱（UV-Vis DRS）对其进行表征和分析,考察了在模拟太阳光下产氢活性及其变化规律,同时探讨了负载物的不同处理方法对光催化剂产氢活性的影响。结果表明,氧化物的负载先氢还原后氧化处理较直接氧化处理有更高的光催化活性;所制备的NiO/N-SrTiO₃、CoO/N-SrTiO₃复合催化剂较单一催化剂有高的产氢活性,当负载量分别为1%、0.5%时达最佳产氢活性,6h内的产氢量分别是未改性N-SrTiO₃样品的4.2、4.9倍。这是由于负载金属氧化物在两相界面处形成的异质结成为催化反应中光生电子和空穴的转移通道,促使其得到有效分离,因而提高了催化剂的光催化活性。更多还原

【Abstract】 Nitrogen doped SrTiO₃ was prepared by solid phase method,and different contents of loaded MO/N- SrTiO₃（M=Ni,Co） heterojunction composite catalysts were further prepared by impregnation-hydrogen reduc- tion method,which were characterized by XRD,SEM,UV-Vis DRS and Fluorescence spectrum techniques. The photocatalytic activity of hydrogen production and the variation laws under simulated sunlight irradiation were investigated.The effect of different treatment methods of loading NiP on hydrogen generation activity of nitrogen doped SrTiO₃ was also studied.The results demonstrated that the NiP loaded composite catalyst showed higher photocatalytic activity when NiP was loaded by hydrogen reduction treatment firstly and then ox- idation treatment than NiP was loaded by direct oxidation treatment.The as-prepared NiO/N-SrTiO₃,CoO/N- SrTiO₃ composite photocatalysts can have high activity of hydrogen production under simulated sunlight irradia- tion compared to the single catalyst.The optimized photocatalytic activity of hydrogen production is achieved when the loaded mass percentage is 1%,0.5% respectively and the amount of hydrogen within 6h is 4.2,4.9 times more than unloaded samples.The reason is that the heterojunction structure formed at the interface of two phases,which becomes the convenient channel for the transfer of photo-generated electrons and holes in the process of photocatalytic reaction after loading the metal oxides,leading to the effective separation of photo- generated carriers,and therefore the photocatalytic activity of catalysts are improved.更多还原