摘要
为提升五氧化二铌(Nb_(2)O_(5))光催化剂在实际应用中的光催化性能,提出五氧化二铌光催化剂的制备及其光催化性能研究。首先,制备五氧化二铌纳米颗粒、五氧化二铌纳米棒和五氧化二铌纳米线,分别标记为Nb_(2)O_(5)-1、Nb_(2)O_(5)-2和Nb_(2)O_(5)-3,并分别暴露在罗丹明B溶液和亚甲基蓝溶液中。然后,使用X射线衍射仪对处理前后的样品进行表征,观察其晶体结构和晶体形貌的变化;使用透射电子显微镜对样品进行观察,分析其形貌、尺寸和分散性,以及有机染料的吸附情况;使用光谱仪进行紫外-可见吸收光谱分析,观察有机染料在样品表面的吸附情况和能带结构变化。最后,通过一定的光源照射并监测有机染料的降解速率等参数,评估样品在不同有机染料环境下的光催化性能。实验结果表明,Nb_(2)O_(5)-2和Nb_(2)O_(5)-3结晶程度较高且为正交相结构,说明该催化剂具有优越的光催化性能和稳定性;Nb_(2)O_(5)-2和Nb_(2)O_(5)-3表征颗粒较为明显,颗粒之间团聚程度高,纳米晶在高温环境下表现为亚稳相状态,光催化活性较高;Nb_(2)O_(5)-2和Nb_(2)O_(5)-3分别在亚甲基蓝溶液和罗丹明B溶液内时,二者可有效降低溶液的吸光值,Nb_(2)O_(5)-2对亚甲基蓝溶液和罗丹明B溶液的催化降解率最大,光催化作用较强。
To improve the photocatalytic performance of niobium pentoxide photocatalyst in practical applications,a study on the preparation and photocatalytic performance of niobium pentoxide photocatalyst is proposed.Firstly,niobium pentoxide nanoparticles,niobium pentoxide nanorods,and niobium pentoxide nanowires were prepared,labeled as Nb_(2)O_(5)-1,Nb_(2)O_(5)-2,and Nb_(2)O_(5)-3,and exposed to rhodamine B solution and methylene blue solution,respectively.Then,the samples before and after treatment were characterized using an X-ray diffractometer to observe the changes in their crystal structure and morphology;Observe the sample using a transmission electron microscope to analyze its morphology,size,dispersibility,and adsorption of organic dyes;Use a spectrometer for UV visible absorption spectroscopy analysis to observe the adsorption and band structure changes of organic dyes on the sample surface.Finally,evaluate the photocatalytic performance of the sample in different organic dye environments by irradiating it with a certain light source and monitoring parameters such as the degradation rate of organic dyes.The experimental results show that Nb_(2)O_(5)-2 and Nb_(2)O_(5)-3 have a high degree of crystallization and an orthogonal phase structure,and have superior photocatalytic performance and stability;The characterization particles of Nb_(2)O_(5)-2 and Nb_(2)O_(5)-3 samples are more obvious,with a high degree of agglomeration between the particles.The nanocrystals exhibit a metastable phase state in high temperature environments and exhibit higher photocatalytic activity.When Nb_(2)O_(5)-2 and Nb_(2)O_(5)-3 are in methylene blue solution and rhodamine B solution,respectively,they can effectively reduce the absorbance of the solution.Nb_(2)O_(5)-2 has the highest catalytic degradation rate and strongest photocatalytic effect on methylene blue solution and rhodamine solution.
作者
王静
李喜兰
郭秀芬
WANG Jing;LI Xi-Lan;GUO Xiu-Fen(School of Applied Chemistry and Materials,Zhuhai College of Science and Technology,Zhuhai 519040,China)
出处
《应用化学》
CAS
CSCD
北大核心
2024年第3期415-421,共7页
Chinese Journal of Applied Chemistry
基金
广东省高校科研平台项目(No.2022KQNCX145)
珠海科技学院创新能力工程项目(No.2019XJCQ016)资助。
