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浙江大学学报(工学版)
浙江大学学报(工学版)
土木与交通工程     
基于湿效应Ce-La/TiO2空心微球制备及光-湿性能
尚建丽, 宗志芳
西安建筑科技大学 材料与矿资学院 陕西 西安 710055
Preparation of Ce-La/TiO2 hollow microspheres and its photocatalysis and humidity control performance based on humidity absorption and desorption
SHANG Jian li, ZONG Zhi fang
College of Materials & Mineral Resources, Xi’an University of Architecture & Technology, Xi’an, Shaanxi 710055, China
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摘要：

以TiO2作为研究对象,选取不同表面活性剂与改性剂,采用溶胶凝胶法制备Ce-La/TiO2空心微球.利用环境测试舱、等温吸放湿法、扫描电镜（SEM）、X射线衍射仪（XRD）、紫外可见分光光度计（UV-Vis）、氮吸附（BET）和激光粒度仪（LPSA）对TiO2空心微球进行性能测试与表征,分析表面活性剂与改性剂对TiO2空心微球性能的影响.结果表明,聚乙烯吡咯烷酮（PVP）作为表面活性剂、Ce-La作为改性剂,不仅有利于TiO2与SiO2的界面分离,形成较好微观形貌；还促使晶粒尺寸减小与比表面积增加,提高吸放湿性能；而且增加光子的利用效率,促使吸收边带红移,提高对可见光源的响应能力.Ce-La/TiO2微球具有良好的空心结构且以开放圆筒孔为主,表现出较好的吸放湿性能,在相对湿度为84.3 %时的平衡含湿量达到0.242 3 g/g；同时兼具较好的光催化性能,经过6 h对甲醛气体的降解效率达到52 %.
Abstract:
Take TiO2 as the study object, different surfactants and modifiers were used to synthesis Ce-La/TiO2 hollow microspheres by Sol-Gel method. The performance of TiO2 hollow microspheres were chartered by environmental test chamber, isothermal humidity absorptiondesorption method, scanning electron microscopy (SEM), X-ray diffractometer (XRD), ultraviolet and visible spectrophotometer (UV-Vis), N2 absorptionadsorption spectrometer (BET), and laser particle analyzer (LPSA), in order to analyze the influence of surfactant and modifier on the TiO2 hollow microspheres’ properties. Results show that, it not only helps to separate the interface between the TiO2 and SiO2 and form perfect microstructure, but also make crystallite size decrease and surface area increase, for taking polyvinylpyrrolidone (PVP) as the surfactant and Ce-La as the modifier, which helps to increase the humidity control performance. Moreover, Ce-La/TiO2 hollow microspheres can increase the utilization of photon, urge absorption spectra redshifted so as to increase the responsiveness under visible light. The Ce-La/TiO2 hollow microspheres have excellent hollow microspheres structure and the main pore structure is open cylindrical pore, with good humidity control performance.
Under the relative humidity of 84.3%, the equilibrium humidity content of Ce-La/TiO2 hollow microspheres reaches 0.242 3 g/g. In addition, photocatalysis effect of Ce-La/TiO2 hollow microspheres is good, and the degradation rate of formaldehyde can arrive at 52 % after 6 h.
出版日期: 2017-03-06
CLC:  TU 322  
基金资助:

国家自然科学基金资助项目（51172176）
通讯作者: 宗志芳,女,讲师.ORCID: 0000-0002-3239-8186     E-mail: zhifangzong@126.com
作者简介: 尚建丽（1957—）,女,教授,博导,从事环保型建筑节能材料等研究.ORCID: 0000-0002-9707-1539. E-mail: shangjianli@xauat.edu.cn
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尚建丽, 宗志芳. 基于湿效应Ce-La/TiO2空心微球制备及光-湿性能[J]. 浙江大学学报(工学版), 10.3785/j.issn.1008-973X.2017.02.011.

SHANG Jian li, ZONG Zhi fang. Preparation of Ce-La/TiO2 hollow microspheres and its photocatalysis and humidity control performance based on humidity absorption and desorption. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 10.3785/j.issn.1008-973X.2017.02.011.

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[1] 尚建丽,麻向龙,张磊,熊磊,张浩. 多孔载体相变材料的热湿综合性能[J]. 浙江大学学报(工学版), 2016, 50(5): 879-886.