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| Study on Preparation Mechanism of Ce-La/TiO2 Composites and Photocatalytic-Mositure-Heat Properties Based on FTIR and UV-Vis Spectra |
| SHANG Jian-li, ZONG Zhi-fang*, SONG Dong-yi, TIAN Ye |
| College of Materials & Mineral Resources, Xi’an University of Architecture & Technology, Xi’an 710055, China |
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Abstract To obtain multifunctional composites which had temperature-humidity properties and photocatalytic degradation ability to harmful substances, Ce-La/TiO2 hollow microspheres were prepared with Sol-Gel method. Then taking the Ce-La/TiO2 hollow microspheres as the carrier materials, the phase change materials—decanoic acid-palmitic acid was filled in Ce-La/TiO2 hollow microspheres’ cavities with vacuum absorption method to prepare Ce-La/TiO2 composites which had photocatalytic-mositure-heat properties. The materials of the main step of Ce-La/TiO2 composites were characterized with FTIR to study the establishment of SiO2 template, the bridging role of surfactant polyvinylpyrrolidone (PVP), the effect of filled decanoic acid-palmitic acid into Ce- La/TiO2 hollow microspheres. The photoresponisve of Ce-La/TiO2 composites was characterized by UV-Vis to study the effect of Ce-La doping to the TiO2 hollow microspheres’ light response ability. Further more，the microstructure of Ce-La/TiO2 composites was characterized with SEM to clarify the Ce-La/TiO2 composites preparation mechanism. The results show that, alkali environment which is provided by ammonium hydroxide is good for condensation reaction of tetraethoxysilane (C8H20O4Si), accelerating generate Si—O—Si groups at 780.00 cm-1 to build SiO2 skeleton form kernel as the template to support the TiO2 wall materials. Adding PVP can generate —C—N— groups at 1 035.00 cm-1, which is benefit for TiO2 attached to the surface of SiO2. Calcinate Ce-La/TiO2 hollow microspheres at high temperature can effectively remove PVP to avoid impurity ions into the composite system. Ce-La dopping makes the Ce-La/TiO2 composites’ absorption edge red shift, which is beneficial in enhancing the photocatalytic degradation ability under visible light. It also enhances the hydroscopicity of Ce-La/TiO2 composites due to —OH groups at 1 630.00 cm-1. Decanoic acid-palmitic acid is fully filled in Ce-La/TiO2 hollow microspheres’ cavities, there is not much change in characteristic absorption peak of each component so the fundamental characteristics of each component could remain unchanged.
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Received: 2016-09-20
Accepted: 2016-12-30
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Corresponding Authors:
ZONG Zhi-fang
E-mail: zhifangzong@126.com
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