磷酸铋(BiPO4)纳米晶的高温相演变和光催化性能研究
High Temperature Driving Phase Evolution and Photocatalytic Performance of Bismuth Phosphate(BiPO4)Nanocrystals
彭思艳 1詹畯伟 1朱正辉 1杨流赛1
作者信息
- 1. 上饶师范学院化学与环境科学学院,江西上饶 334001
- 折叠
摘要
采用室温共沉淀法合成磷酸铋(BiPO4)纳米晶,并对其进行不同温度的烧结处理,最后利用X射线粉末衍射(X-ray powder diffraction,XRD)、扫描电子显微镜(scanning electron microscope,SEM)和紫外-可见漫反射吸收光谱(UV visible diffuse reflectance absorption spectroscopy,UV-Vis DRS)对样品的晶体结构、形貌和光学吸收进行表征.结果表明,室温共沉淀合成的样品和600 ℃烧结所制备的样品结构均为纯低温单斜相的磷酸铋(LT-BiPO4),且两种样品均为单分散米粒状颗粒形貌;在700℃和800 ℃烧结处理后,低温单斜相的LT-BiPO4可完全转变为高温单斜相的磷酸铋(HT-BiPO4),HT-BiPO4的米粒状颗粒可全部自组装成三维多孔网络结构的形貌;700 ℃烧结样品光催化降解亚甲基蓝的性能最优,紫外灯照射80分钟(min)后,700 ℃烧结样品的亚甲基蓝降解率可达76.2％.
Abstract
BiPO4 nanocrystals were synthesized by using room temperature co-precipitation method and further sintered at different temperatures.BiPO4 nanocrystals were characterized by using X-ray powder diffraction(XRD),scan-ning electron microscopy(SEM)and UV-Vis diffuse reflection absorption spectroscopy(UV-Vis DRS),which were used to characterize the crystal structure,morphology and optical absorption,respectively.The results show that the samples synthesized by using room temperature coprecipitation and sintered at 600 ℃ were pure low tempera-ture monoclinic phase LT-BiPO4,and they show monodisperse rice-like particles.After being sintered at 700 ℃ and 800 ℃,the low-temperature monoclinic phase LT-BiPO4 completely transformed into high-temperature monoclinic phase HT-BiPO4,and the rice-like particles were self-assembled into the morphology of three-dimensional porous network structure.Moreover,the photocatalytic degradation of methylene blue was tested by ultraviolet light.The samples sintered at 700 ℃ showed the best photocatalytic performance,and the degradation rate of methylene blue could be up to 76.2％after 80 min under UV light irradiation.
关键词
共沉淀法/磷酸铋/相演变/光催化/亚甲基蓝Key words
co-precipitation method/bismuth phosphate/phase evolution/photocatalytic/methylene blue引用本文复制引用
出版年
2024
NETL
NSTL
万方数据