摘要
以钛酸丁酯、硝酸铋和硝酸银为原料,FTO为基底,采用水热法结合超声沉积法合成了Ag_2O/TiO_2异质结光催化剂。采用场发射扫描电子显微镜(FESEM)、X射线衍射仪(XRD)、紫外-可见吸收光谱(UV-Vis)分析测试手段对样品的形貌和结构进行了表征。结果表明,Ag_2O/TiO_2异质结是由直径约200~300 nm的TiO_2纳米棒镶嵌着Ag_2O纳米颗粒组成,与TiO_2纳米棒阵列相比,Ag_2O/TiO_2异质结在可见光区有明显的光吸收。Ag_2O/TiO_2异质结的光催化效率明显提高。尤为重要的是,经光处理后,最终得到稳定的Ag-Ag_2O/TiO_2三元体系,并对Ag-Ag_2O/TiO_2三元体系提高光催化稳定性和活性的机理进行了分析。
Ag_2O/TiO_2 heterojunction photocatalysts were synthesized on FTO through hydrothermal method and ultrasonic precipitation method with precursors（Ti（OBu）4,Bi（NO_3）_2and Ag NO_3）. The structures and morphologies of Ag_2 O/TiO_2 heterostructure were investigated by field emission scanning electron microscopy（FESEM）, X-ray diffraction（XRD） and UV-Vis spectra. The results indicate that Ag_2 O/TiO_2 heterostructures consist of TiO_2 nanorod arrays decorated with 200-300 nm Ag_2 O nanoparticles. Compared to the pure TiO_2 nanorod arrays,the Ag_2 O/TiO_2 heterostructures exhibit obviously absorption under visible light irradiation. Ag_2 O/TiO_2 heterojunction photocatalytic activity improves significantly. Further,through visible light irradiation treatment,Ag-Ag_2 O/TiO_2 composite stability system were fabricated,the mechanism for improving photocatalytic stability and activity of Ag-Ag_2 O/TiO_2 composite system was also proposed.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2017年第2期243-250,共8页
Journal of Synthetic Crystals
基金
国家自然科学基金(51402209)
山西省基础研究项目(2015021075)
山西省高校科技创新研究项目(2016124)
太原理工大学校基金(2015MS046)
