摘要
采用溶剂热法-浸渍法在低温条件下制备了Pt/BiOCl纳米结构,用XRD、EDS、SEM、(HR)TEM、N2吸附-脱附仪、UVVis吸收光谱仪、荧光探针技术对样品进行了表征,考察了其在氙灯辐照下对气相甲苯的光催化降解性能。结果表明,Pt/BiOCl纳米结构具有良好的结晶度,样品BET比表面积达到28.48 m2/g;其在紫外光区和可见光区具有良好的光吸收性质;而且Pt修饰也使样品表面羟基自由基生成能力得到明显增强。Pt/BiOCl纳米结构对气相甲苯的光催化降解效率比未Pt修饰的BiOCl纳米结构提高了约70%,比BiOCl纳米片提高了6.6倍,同时,Pt修饰还能抑制甲醛生成、避免更大危害性的二次污染。Pt/BiOCl纳米结构对气相甲苯光催化效率的提高与其较大的比表面积、增强的光吸收性质和高效的光生载流子分离能力有关。
Pt/BiOCI nanostructures were prepared by a facile low-temperature solvothermal-impregna- tion method and were characterized by XRD, EDS, SEM, （HR）TEM, N2 Adsorption-desorption, UV-Vis Ab- sorption Spectroscopy and fluorescent probe method. The photocatalytic performance was evaluated by photodegrading gas-phase toluene under Xe light irradiation. The results show that Pt/BiOCI nanostruc- tures have good crystallinity and exhibit a BET specific surface area of 28.48 m2/g. The samples display excellent optical absorption properties in the range of both UV light and visible light. The ability of forming hydroxyl radicals on the surface of photocatalysts was also enhanced a lot. The photocatalytic perfor- mance was improved obviously. Under Xe light irradiation, the photocatalytic efficiency increased by 70% compared with the sample of BiOCI nanostructures without being modified with Pt nanoparticles. And that value increased by 6.6 times when being compared with that of BiOCI nanosheets. Additionally, the modi- fication of Pt nanoparticles on the surface of BiOCI nanostructures also played a part in inhibiting the for- mation of formaldehyde and thus preventing more hazardous secondary pollution during the photocataly- sis of toluene. The improved photocatalytic activity of Pt/BiOCI nanostructures associates with their effi- cient separation of photogenerated carriers.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2013年第6期583-588,共6页
Chinese Journal of Materials Research
基金
国家重点基础研究发展计划2009CB939705和2009CB939702
国家自然科学基金21007053和21001090
河南省高校科技创新团队支持计划2012IRTSTHN021资助项目~~
