施主掺杂对BaTiO3钙钛矿半导体纳米晶光催化性能的影响
Effects of Donor-Doped on Photocatalytic Properties of BaTiO3-Based Nanoparticle
作者单位E-mail
孟国祥 空军工程大学航空航天工程学院学员一大队, 西安 710051  
田晓霞 空军工程大学基础部, 西安 710051 xiaoxiatian@126.com 
张家瑞 空军工程大学防空反导学院学员二大队, 西安 710051  
张翔 空军工程大学航空航天工程学院学员一大队, 西安 710051  
韩丰庆 空军工程大学航空航天工程学院学员一大队, 西安 710051  
屈绍波 空军工程大学基础部, 西安 710051 shaoboqu@126.com 
摘要: 以沉淀法制备的Cu2O为牺牲模板剂,采用水热法制备La施主掺杂的BaTiO3钙钛矿半导体纳米晶,借助X射线衍射(XRD)、透射电子显微镜(TEM)、高分辨透射电镜(HRTEM)、X射线光电子能谱((XPS)、扫描电子显微镜(SEM)、紫外-可见漫反射光谱(UV-Vis DRS)表征La掺杂的BaTiO3晶的物相、微观形貌及光催化性能。结果表明,La掺杂BaTiO3构建了晶体缺陷,有效提高了BaTiO3的光催化性能。当掺杂量为4%(w/w)时,样品的光催化性能最好,在可见光照射360 min后,对4-硝基苯酚溶液的降解率可达到93.2%。该催化剂5次循环后的活性仍然大于86.7%,表明La施主掺杂的BaTiO3是一种有效的可见光催化剂。
关键词: BaTiO3  施主掺杂  模板法  光催化
基金项目: 国家自然科学基金(No.21471159)、国家级大学生创新创业计划(No.201890052006)、陕西省自然科学基金(No.2019JZ-40)、省部共建耐火材料与冶金国家重点实验室开放课题(No.G201707)、空军工程大学基础部自主立项科研(No.YNJC19070601,JK2019115)资助项目。
Abstract: Cu2O was synthesized by chemical precipitation, La doped BaTiO3-based powders were synthesized via a hydrothermal method using the Cu2O as the sacrifice template. The structure, morphology and visible light properties have been characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), high-resolution transmission electron microscope (HR-TEM), X-ray photoelectron spectroscopy (XPS), scanning electron micro-graphs (SEM), UV-Vis diffuse reflectance spectrophotometer (UV-Vis DRS). The results showed that the doping of La3+ increased the conductivity and made the range of photo-response broadened, which reduced the band gap of the semiconductor and accelerated the separation of photo-generated electron hole pairs. The surface defects were induced with a facile and effective approach by La3+ ion doping, and the photocatalytic performance of BaTiO3 was improved. However, as the doping amount of La3+ ions increased, the band gap of the semiconductors decreased and the redox ability of the phototgenerated electrons and holes deceased when the dopant was excessive. When the doping amount was 4%(w/w), the photocatalytic performance of the sample was the best, and the degradation efficiency of 4-nitrophenol was 93.2% after 360 min visible light irradiation. The decomposition rate of 4-nitrophenol was still above 86.7% even after 5 cycles, thus artificial catalytic defects of La donor-doped BaTiO3-based nanoparticle could effectively improve the photocatalytic properties.
Keywords: BaTiO3  donor doping  template method  photocatalytic
投稿时间:2019-01-01 修订日期:2019-06-14
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孟国祥,田晓霞,张家瑞,张翔,韩丰庆,屈绍波.施主掺杂对BaTiO3钙钛矿半导体纳米晶光催化性能的影响[J].无机化学学报,2019,35(8):1387-1395.
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