Cd掺杂δ-Bi2O3纳米片的制备及其光催化固氮性能
Preparation and Photocatalytic Nitrogen Fixation Performance of Cd Doping δ-Bi2O3 Nanosheets
作者单位E-mail
高晓明 延安大学化学与化工学院, 陕西省化学反应工程重点实验室, 延安 716000 dawn1026@163.com 
尚艳岩 延安大学化学与化工学院, 陕西省化学反应工程重点实验室, 延安 716000  
刘利波 延安大学化学与化工学院, 陕西省化学反应工程重点实验室, 延安 716000  
高凯龙 延安大学化学与化工学院, 陕西省化学反应工程重点实验室, 延安 716000  
摘要: 采用一步醇热法制备了Cd掺杂δ-Bi2O3,并用X射线衍射(XRD)、透射电子显微镜(TEM)等手段对其微观结构、表面元素、能带结构、光电化学性质等进行表征。结果表明Cd掺杂δ-Bi2O3是由二维纳米片组装而成的微球,Cd以Cd2+形式掺杂在δ-Bi2O3晶格间隙。由于Cd的掺杂,δ-Bi2O3禁带宽减小,光响应范围扩大,光生载流子的传递与分离效率提高。在常温常压下,考察了Cd-δ-Bi2O3可见光催化固氮效果,结果表明,光照3 h时,6% Cd-δ-Bi2O3的光催化固氮速率为1.6 mmol·g-1·h-1·L-1,是δ-Bi2O3的10.67倍。Cd的掺杂点会成为光生电子的陷阱,延缓光生电子的表面传递,增强目标分子的化学吸附。
关键词: Cd掺杂δ-Bi2O3  二维纳米片  光催化固氮  掺杂缺陷
基金项目: 国家自然科学基金(No.21766039)、延安市科技局项目(No.2016CGZH-10)和延安大学大学生创新创业训练计划(No.D2017021)基金资助。
Abstract: Cd-doped δ-Bi2O3 (Cd-δ-Bi2O3) were prepared by the alcoholic-hydrothermal method, and characterized by X-ray diffraction (XRD), transmission electron microscope (TEM) and so on. The results showed that Cd-δ-Bi2O3 was assembled by 2D nanosheets. Cd in the form of Cd2+ was introduced in the lattice gap of δ-Bi2O3 and belonged to interstitial doping. Due to Cd doping, the band gap was decreased, the light-harvesting capability was enhanced, and the transmission and separation efficiency of carriers was improved. At room temperature and atmospheric pressure, the photocatalytic nitrogen fixation was investigated under visible light irradiation. The results showed that the photocatalytic nitrogen fixation rate of 6%Cd-δ-Bi2O3 with 3 h of light irradiation was 1.6 mmol·g-1·h-1·L-1, which was 10.67 times higher than that of δ-Bi2O3. The mechanism of photocatalytic N2 fixation was discussed by means of photocurrent and impedance. Doping Cd defect serves as the trap of photogenerated electrons, which delays the surface transfer of photogenerated electrons and enhances the chemisorption of target molecules.
Keywords: Cd doping δ-Bi2O3  2D nanosheets  photocatalytic nitrogen fixation  doping defect
投稿时间:2019-01-02 修订日期:2019-02-22
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高晓明,尚艳岩,刘利波,高凯龙.Cd掺杂δ-Bi2O3纳米片的制备及其光催化固氮性能[J].无机化学学报,2019,35(4):580-588.
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