Bi_(2)O_(3)-TiO_(2)异质结纳米纤维对甲苯催化发光性能研究  

Heterojunction Bi_(2)O_(3)-TiO_(2) Nanofiber as Cataluminescence Material for Detection of Toluene

作　　者：胡明江 吕春旺 赵丽霞 王旭荣 宋艳苹 衡丽君 HU Ming-Jiang;LYU Chun-Wang;ZHAO Li-Xia;WANG Xu-Rong;SONG Yan-Ping;HENG Li-Jun(School of Energy and Building Environmental Engineering,Henan University of Urban Construction,Pingdingshan 467036,China)

机构地区：[1]河南城建学院能源与建筑环境工程学院,平顶山467036

出　　处：《分析化学》2022年第7期1103-1111,共9页Chinese Journal of Analytical Chemistry

基　　金：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Bi_(2)O_(3)-TiO_(2)异质结纳米纤维(Bi_(2)O_(3)-TiO_(2)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Bi_(2)O_(3)-TiO_(2)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Bi_(2)O_(3)-TiO_(2)NFs的原子电荷密度和差分电荷密度,探索了Bi_(2)O_(3)-TiO_(2)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0.1~200μg/m^(3)范围内呈良好的线性关系(R^(2)=0.9944),响应/恢复时间为7.2 s/9.4 s,检出限(S/N=10)为0.1μg/m^(3),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。Bi_(2)O_(3)-TiO_(2) nanofibers(NFs)were synthesized by electrospinning method,and a geterojunction cataluminescence toluene gas sensor was thus designed by depositing Bi_(2)O_(3)-TiO_(2)NFs onto the cylindrical ceramic heating rod surface as cataluminescence material by dip-coating method.The crystalline phase and microstructure of Bi_(2)O_(3)-TiO_(2)NFs were displayed using X-ray diffraction and scanning electron microscope,and the cataluminescence mechanism and electrochemical characteristic of Bi_(2)O_(3)-TiO_(2)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 Bi_(2)O_(3)-TiO_(2)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 0.1-200μg/m^(3).The detection limit was 0.1μg/m^(3)(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.

关 键 词：静电纺丝 甲苯 传感器 异质结 催化发光 

分 类 号：TQ340.64[化学工程—化纤工业] O643.36[理学—物理化学] X701[理学—化学]