物理化学学报 >> 2016, Vol. 32 >> Issue (5): 1247-1256.doi: 10.3866/PKU.WHXB201602231

研究论文 上一篇    下一篇

沉淀法制备Bi2O3的晶相转变过程及其光催化性能

刘果1,卢圆圆1,张静1,*(),李智2,*(),冯兆池3,李灿3   

  1. 1 辽宁石油化工大学化学化工与环境学部,辽宁抚顺113001
    2 中国科学院理化技术研究所,光化学转换与功能材料重点实验室,北京100190
    3 中国科学院大连化学物理研究所,催化基础国家重点实验室,辽宁大连116023
  • 收稿日期:2015-11-19 发布日期:2016-05-07
  • 通讯作者: 张静,李智 E-mail:jingzhang_dicp@live.cn;zhili@126.com
  • 基金资助:
    国家自然科学基金(21573101);教育部留学回国科研启动基金(教外司留[2013]1792号);辽宁省自然科学基金(2014020107);辽宁省高等学校优秀人才支持计划项目(LJQ2014041);中国科学院理化技术研究所光化学转换与功能材料重点实验室开放课题资助

Phase Transformation and Photocatalytic Properties of Bi2O3 Prepared Using a Precipitation Method

Guo LIU1,Yuan-Yuan LU1,Jing ZHANG1,*(),Zhi LI2,*(),Zhao-Chi FENG3,Can LI3   

  1. 1 School of Chemistry and Materials Science, Liaoning Shihua University, Fushun 113001, Liaoning Province, P. R. China
    2 Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
    3 State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning Province, P. R. China
  • Received:2015-11-19 Published:2016-05-07
  • Contact: Jing ZHANG,Zhi LI E-mail:jingzhang_dicp@live.cn;zhili@126.com
  • Supported by:
    the National Natural Science Foundation of China(21573101);Scientific Research Foundation for the Returned Overseas Chinese Scholars, Ministry of Education of China(教外司留[2013]1792号);Natural Science Foundation of Liaoning Province, China(2014020107);Program for Liaoning Excellent Talents in University, China(LJQ2014041);Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences

摘要:

以硝酸铋为原料,氨水为沉淀剂,通过液相沉淀法制得前驱体Bi(OH)3,并将Bi(OH)3分别在不同温度和时间下焙烧。利用X射线衍射(XRD)、拉曼光谱、热重(TG)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)及紫外-可见漫反射光谱(UV-Vis DRS)详细研究了Bi(OH)3转变为Bi2O3的过程及相变过程中粒子形貌、大小、光吸收性质等。结果表明,前驱体Bi(OH)3经过焙烧之后,发生了如下的转变过程:Bi(OH)3→Bi5O7NO3β-Bi2O3/Bi5O7NO3β-Bi2O3/Bi5O7NO3/α-Bi2O3α-Bi2O3,而且转变过程伴随着粒子长大。在上述转变过程中,与Bi5O7NO3β-Bi2O3转变的过程相比,从β-Bi2O3α-Bi2O3相变过程更为迅速。此外,以光催化降解罗丹明B(RhB)为模型反应,考察了不同晶相的Bi2O3光催化活性,结果表明Bi5O7NO3β-Bi2O3材料具有优异的光催化性能,而α-Bi2O3具有较低的光催化活性。

关键词: Bi5O7NO3, β-Bi2O3, α-Bi2O3, 氧化铋, 沉淀法, 相变

Abstract:

A Bi(OH)3 precursor was prepared using a precipitation method using bismuth nitrate as a starting material and ammonia as the precipitation agent. Bi(OH)3 was then calcined at different temperatures and different time. X-ray diffraction (XRD), Raman spectroscopy, thermogravimetry (TG), scanning electronic microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and UV-Vis diffuse reflectance spectroscopy (UVVis DRS) were used to investigate the phase transformation from Bi(OH)3 to Bi2O3 and the particle size, morphology, and optical properties of Bi2O3 during the phase transformation. It was found that Bi(OH)3 after calcination undergoes the following process: Bi(OH)3→Bi5O7NO3β-Bi2O3/Bi5O7NO3β-Bi2O3/Bi5O7NO3/α-Bi2O3α-Bi2O3. It was observed that the above phase transformation from Bi(OH)3 to Bi2O3 and the growth of the particle size are interrelated. It was also found that the phase transition from β-Bi2O3 to α-Bi2O3 was faster compared with the phase transition from Bi5O7NO3 to β-Bi2O3. Also, the degradation of Rhodamine B (RhB) was studied to investigate and compare the photocatalytic performance of Bi2O3 with different crystalline phases. The result indicates that Bi5O7NO3 and β-Bi2O3 exhibit excellent photocatalytic performance, while α-Bi2O3 has a low photocatalytic activity.

Key words: Bi5O7NO3, β-Bi2O3, α-Bi2O3, Bismuth oxide, Precipitation method, Phase transformation

MSC2000: 

  • O643.3