光催化材料Bi4O7/BiOBr的制备及其光催化性能研究
收稿日期: 2020-10-19
网络出版日期: 2021-04-23
Preparation of photocatalytic materials of Bi4O7/BiOBr and study on their photocatalytic performance
Received date: 2020-10-19
Online published: 2021-04-23
以自制的铋酸钾(KBiO3)为前驱物,采用低温水热法制备七氧化四铋(Bi4O7),再利用氢溴酸原位离子刻蚀法首次成功制备了Bi4O7/BiOBr复合物。通过X射线衍射(XRD)和扫描电子显微镜(SEM)分别观测了样品的物相和形貌特征,复合相具有比二者单相更佳的可见光降解罗丹明B(RhB)的性能,最高可达到30 min内降解86.9%;紫外可见漫反射光谱(DRS)和光致发光光谱(PL)分别证明了其性能的提升是由于复合相拥有更广的光学响应范围和更低的光生载流子复合效率。超氧自由基和空穴是该体系光催化降解过程中的活性物质,并由此提出了一种可能的光催化降解机制,且复合相比单相Bi4O7具有更好的光催化降解稳定性。
关键词: 光催化; Bi4O7/BiOBr复合物; 可见光; 罗丹明B
黄夏梦 . 光催化材料Bi4O7/BiOBr的制备及其光催化性能研究[J]. 无机盐工业, 2021 , 53(4) : 112 -116 . DOI: 10.11962/1006-4990.2020-0275
Bismuth tetroxide(Bi4O7) was prepared by low temperature hydrothermal method using homemade potassium bismuth oxide(KBiO3) as precursor and Bi4O7/BiOBr composite was successfully prepared by in-situ ion etching with hydrobromic acid.The phase and morphology characteristics of the samples were observed by x-ray diffraction(XRD) and scanning electron microscope(SEM),respectively.The composite phase had better visible light degradation performance of Rhodamine B(RhB)than the single phase,which could reach 86.9% degradation in 30 min at most.Ultraviolet-visible diffuse reflectance spectroscopy(DRS) and Photoluminescence spectroscopy(PL) respectively proved that the improvement of the performance was due to the wider optical response range and lower photogenerated carrier recombination efficiency of the composite phase.·O 2-and h + were the active substances in the photocatalytic degradation process of the system.According to this,a possible photocatalytic degradation mechanism was proposed.The composite phase had better photocatalytic degradation stability than the singlephase Bi4O7.
Key words: photocatalysis; Bi4O7/BiOBr composite; visible light; Rhodamine B
[1] | 张晶, 张亚萍, 于濂清 , 等. 纳米二氧化钛的水热制备及光催化研究进展[J]. 无机盐工业, 2010,42(9):6-9. |
[2] | 龚家竹, 于奇志 . 纳米二氧化钛的现状与发展[J]. 无机盐工业, 2006,38(7):1-2,48. |
[3] | Zhang Xi, Ai Zhihui, Jia Falong , et al. Generalized one-pot synjournal,characterization,and photocatalytic activity of hierarchical BiOX (X=Cl,Br,I) nanoplate microspheres[J]. Journal of Physical Chemistry C, 2008,112(3):747-753. |
[4] | Galván D H, Nú?ez-González R, Rangel R , et al. Assessment of functionals for first-principle studies of the structural and electronic properties of δ-Bi2O3[J]. Advances in Condensed Matter Physics, 2015(7):1-9. |
[5] | Malathi A, Madhavan J, Ashokkumar M , et al. A review on BiVO4 photocatalyst:Activity enhancement methods for solar photocatalytic applications[J]. Applied Catalysis A:General, 2018,555:47-74. |
[6] | Tian Jian, Hao Pin, Wei Na , et al. 3D Bi2MoO6 nanosheet/TiO2 nanobelt heterostructure:Enhanced photocatalytic activities and photoelectochemistry performance[J]. ACS Catalysis, 2005,5:4530-4536. |
[7] | Huang Wenlai, Zhu Qingshan . Electronic structures of relaxed BiOX (X=F,Cl,Br,I) photocatalysts[J]. Computational Materials Science, 2008,43:1101-1108. |
[8] | Jiang Zaiyong, Huang Baibiao, Lou Zaizhu , et al. Immobilization of BiOX(X=Cl,Br) on activated carbon fibers as recycled photocatalysts[J]. Dalton Transactions, 2014,43(22):8170-8173. |
[9] | Zou Zhijun, Qiu Yang, Xie Changsheng , et al. CdS/TiO2 nanocomposite film and its enhanced photoelectric responses to dry air and formaldehyde induced by visible light at room temperature[J]. Journal of Alloys and Compounds, 2015,645:17-23. |
[10] | 王吉玲 . 溴氧化铋纳米片的制备及其光催化性能调控[D]. 武汉:华中师范大学, 2013 . |
[11] | Sun Meng, Wang Yu, Shao Yu , et al. Fabrication of a novel Zscheme g-C3N4/Bi4O7 heterojunction photocatalyst with enhanced visible light-driven activity toward organic pollutants[J]. Journal of Colloid and Interface Science, 2017,501:123-132. |
[12] | Sun Meng, Yan Tao, Zhang Yaru , et al. Rod-like Bi4O7 decorated Bi2O2CO3 plates:Facile synjournal,promoted charge separation,and highly efficient photocatalytic degradation of organic contaminants[J]. Journal of Colloid & Interface Science, 2018,514:240-249. |
/
〈 |
|
〉 |