Light-stimulated composition conversion in TiO2-based nanofibers
Light-stimulated composition conversion in TiO2-based nanofibers
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DOI：
10.1021/jp065590n
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发表时间：
2007-01-18
影响因子：
3.7
通讯作者：
Fujishima, Akira
中科院分区：
文献类型：
--
作者：
Jin, Ming;Zhang, Xintong;Fujishima, Akira
采用静电纺丝法制备银-TiO2纳米纤维（Ag/Ti = 1/50），然后在200℃下热处理并在550℃下煅烧。静电纺丝溶液由AgNO3、四异丙醇钛（TTIP）和聚乙烯吡咯烷酮（PVP）组成。紫外光和可见光交替照射银TiO(2)纳米纤维可以使TiO2基纳米纤维上的银物质相互转化，分别生成Ag金属和Ag2O，并且该过程已通过紫外-可见光谱、TEM、XRD和XPS进行了表征。该相互转化过程可以通过 TiO2 对 Ag2O 的光还原和可见光对 Ag 的氧化来合理化。乙醛光分解测量表明，在这种银-TiO2纳米纤维光催化体系中，Ag2O比Ag-0具有更好的矿化能力。 TiO2基纳米纤维上组合物的光诱导转化可能在光催化、抗菌技术和其他领域得到应用。
Silver-TiO2 nanofibers (Ag/Ti = 1/50) were fabricated by the electrospinning method, followed by heat treatment at 200 degrees C and calcination at 550 degrees C. The electrospinning solution was comprised of AgNO3 and titanium tetraisopropoxide (TTIP) with polyvinylpyrrolidone (PVP). Alternating irradiation of the silverTiO(2) nanofibers with ultraviolet and visible light can interconvert the silver species on the TiO2-based nanofibers to yield Ag metal and Ag2O, respectively, and this process has been characterized by UV-visible spectra, TEM, XRD, and XPS. The interconversion process can be rationalized in terms of the photoreduction of Ag2O by TiO2 and the oxidization of Ag by visible light. Acetaldehyde photodecomposition measurements indicate that Ag2O has better mineralization ability than Ag-0 in this kind of silver-TiO2 nanofiber photocatalytic system. The photoinduced conversion of composition on TiO2-based nanofibers may find applications in photocatalysis, antibacterial technology, and other areas.