CAJ | 학술논문

采用溶胶-凝胶法制备 Ce 掺杂 TiO2(Ce-TiO2)纳米颗粒,借助 XRD、XPS、UV-Vis、DRS 等手段对催化剂的结构和理化性质进行分析表征,并以酸性红染料作为模型污染物,考察 Ce-TiO2在可见光作用下的催化活性。实验结果表明,在 CeO2和 TiO2界面形成了Ce-O-Ti键,从而抑制了催化剂的晶化和相转变过程,并在 TiO2的禁带中引入了 Ce4f 掺杂能级。Ce-TiO2在可见光区具有显著吸收,且光生载流子的复合受到有效抑制,因此,Ce 掺杂明显提高了TiO2降解污染物的效率。当 Ce 掺杂量为20%(摩尔分数),煅烧温度为400℃时,催化剂的活性达到最佳。
채용용효-응효법제비 Ce 참잡 TiO2(Ce-TiO2)납미과립,차조 XRD、XPS、UV-Vis、DRS 등수단대최화제적결구화이화성질진행분석표정,병이산성홍염료작위모형오염물,고찰 Ce-TiO2재가견광작용하적최화활성。실험결과표명,재 CeO2화 TiO2계면형성료Ce-O-Ti건,종이억제료최화제적정화화상전변과정,병재 TiO2적금대중인입료 Ce4f 참잡능급。Ce-TiO2재가견광구구유현저흡수,차광생재류자적복합수도유효억제,인차,Ce 참잡명현제고료TiO2강해오염물적효솔。당 Ce 참잡량위20%(마이분수),단소온도위400℃시,최화제적활성체도최가。
Ce-doped TiO2 nanoparticles were prepared by sol-gel method.The structure and physicochemical properties of the catalysts were investigated by means of XRD,FT-IR,XPS,UV-Vis DRS,etc.The photocat-alytic activities of Ce-doped TiO2 were evaluated by the degradation of acid red under visible light irradiation. The experiment results show that Ce-O-Ti bonds are formed on the interface of cerium oxide and TiO2 ,so that the crystallization and phase transition processes of the catalyst are impeded.Ce-TiO2 has a significant ab-sorption in the visible region and the recombination of the photo-generated electron and hole pairs was greatly inhibited.Hence,the visible-light-driven photocatalytic efficiency of Ce-TiO2 was significantly enhanced.The catalyst doped with 20% Ce presents the best activity when calcinated at 400 ℃.