Bi2O3-TiO2异质结纳米纤维对甲苯催化发光性能研究

引用本文: 胡明江, 吕春旺, 赵丽霞, 王旭荣, 宋艳苹, 衡丽君. Bi₂O₃-TiO₂异质结纳米纤维对甲苯催化发光性能研究[J]. 分析化学, 2022, 50(7): 1103-1111. doi: 10.19756/j.issn.0253-3820.221062 shu

Citation: HU Ming-Jiang, LYU Chun-Wang, ZHAO Li-Xia, WANG Xu-Rong, SONG Yan-Ping, HENG Li-Jun. Heterojunction Bi₂O₃-TiO₂ Nanofiber as Cataluminescence Material for Detection of Toluene[J]. Chinese Journal of Analytical Chemistry, 2022, 50(7): 1103-1111. doi: 10.19756/j.issn.0253-3820.221062 shu

Bi₂O₃-TiO₂异质结纳米纤维对甲苯催化发光性能研究

河南城建学院能源与建筑环境工程学院, 平顶山 467036

通讯作者: 胡明江,E-mail:hu_mingjiang@163.com

基金项目:
河南省科技攻关计划项目(No.212102210199)资助。

摘要: 采用静电纺丝法制备了Bi₂O₃-TiO₂异质结纳米纤维(Bi₂O₃-TiO₂ NFs),将其均匀涂覆于陶瓷加热棒表面,组装了一种催化发光(CTL)传感系统用于快速检测甲苯。采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、X射线光电子能谱仪(XPS)、傅里叶红外光谱(FT-IR)等方法对Bi₂O₃-TiO₂ NFs的晶相、形貌和光电特性进行了分析。利用密度泛函理论(DFT)计算了Bi₂O₃-TiO₂ NFs的原子电荷密度和差分电荷密度,探索了Bi₂O₃-TiO₂ NFs检测甲苯的CTL机理。在载气流速200 mL/min、温度250℃、波长450 nm条件下,Bi30传感器CTL强度与甲苯浓度在0.1-200 μg/m³范围内呈良好的线性关系(R²=0.9944),响应/恢复时间为7.2 s/9.4 s,检出限(S/N=10)为0.1 μg/m³,相对标准偏差RSD为1.8%。本研究为快速、准确检测甲苯提供了可行方法,为构建挥发性有机化合物传感平台提供了参考。

关键词:

English

Heterojunction Bi₂O₃-TiO₂ Nanofiber as Cataluminescence Material for Detection of Toluene

School of Energy and Building Environmental Engineering, Henan University of Urban Construction, Pingdingshan 467036, China

Corresponding author: HU Ming-Jiang, hu_mingjiang@163.com

Received Date: 02 February 2022
Revised Date: 24 April 2022
Fund Project:
Supported by the Science and Technology Foundation of He'nan Province, China (No.212102210199).

Abstract: Bi₂O₃-TiO₂ nanofibers (NFs) were synthesized by electrospinning method, and a geterojunction cataluminescence toluene gas sensor was thus designed by depositing Bi₂O₃-TiO₂ NFs onto the cylindrical ceramic heating rod surface as cataluminescence material by dip-coating method. The crystalline phase and microstructure of Bi₂O₃-TiO₂ NFs were displayed using X-ray diffraction and scanning electron microscope, and the cataluminescence mechanism and electrochemical characteristic of Bi₂O₃-TiO₂ NFs in detection of toluene were analyzed by UV-Vis spectrometry, X-ray photoelectron spectroscopy and Fourier infrared spectroscopy (FT-IR). Density functional theory (DFT) was used to calculate the charge density and differential charge density of atoms in Bi₂O₃-TiO₂ NFs heterojunction, and the sensitization mechanism of sensor was further proposed for detecting toluene gas. Under the optimal conditions including 450 nm of wavelength, 200 mL/min of flow rate and at 250℃, there was a good relationship between the CTL intensity of Bi30 toluene gas sensor and the toluene concentration in the range of 0.1-200 μg/m³. The detection limit was 0.1 μg/m³ (S/N=10), the RSD was 1.81%, and the dynamic response time and recover time of toluene gas sensor were 7.2 s and 9.4 s respectively. This study provided a feasible strategy for rapid and efficient detection of toluene, as well as a new sensing platform for detection of volatile organic compounds.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

Bi₂O₃-TiO₂异质结纳米纤维对甲苯催化发光性能研究

通讯作者: 胡明江,E-mail:hu_mingjiang@163.com

English

Heterojunction Bi₂O₃-TiO₂ Nanofiber as Cataluminescence Material for Detection of Toluene

Corresponding author: HU Ming-Jiang, hu_mingjiang@163.com

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