Electrospun titania nanofibers segregated by graphene oxide for improved visible light photocatalysis
Electrospun titania nanofibers segregated by graphene oxide for improved visible light photocatalysis
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由氧化石墨烯隔离的电纺二氧化钛纳米纤维可改善可见光光催化
DOI：
10.1016/j.apcatb.2016.08.056
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发表时间：
2017-02
期刊：
影响因子：
--
通讯作者：
Guo Zhanhu
中科院分区：
文献类型：
--
作者：
Zhang Li;Zhang Qinghong;Xie Hongyong;Guo Jiang;Lyu Hailong;Li Yaogang;Sun Zhiguo;Wang Hongzhi;Guo Zhanhu
以聚乙烯吡咯烷酮（PVP）为成纤载体，采用静电纺丝法制备了一维TiO 2/氧化石墨烯（GO）复合纳米纤维光催化剂。载体PVP在500 °C烧除后，GO的含量可达5wt%，GO的分散性良好，GO的分离得到了连续的TiO 2纳米纤维。光致发光研究表明，与裸TiO 2纳米纤维相比，在TiO 2/GO纳米纤维中观察到的激子强度较低，表明复合纳米纤维可以有效地抑制TiO 2中光生电子和空穴的复合。光催化研究表明，在可见光照射下，与裸TiO 2纳米纤维相比，TiO 2/GO复合纳米纤维具有更高的载流子迁移率和更强的光催化活性。此外，随着GO含量的增加，TiO 2/GO复合纳米纤维的光催化性能增强。本文提供的结果为TiO 2/GO复合材料作为高性能光催化剂在环境修复中具有潜在用途提供了新的见解。
The present study reports the electrospun one-dimensional TiO2/graphene oxide (GO) composite nanofibers photocatalysts using polyvinylpyrrolidone (PVP) as a fiberizing carrier. Continuous TiO2nanofibers segregated by the well-dispersed GO with the content even high as 5 wt% were obtained after the carrier PVP was burnt away at 500 °C. The observed lower excitonic intensity from photoluminescent study in the TiO2/GO samples than that in bare TiO2nanofibers indicated that the recombination of photoinduced electrons and holes in TiO2could be effectively inhibited in the composite nanofibers. Photocatalytic studies suggested that the TiO2/GO composite nanofibers showed higher mobility of charge carriers and enhanced photocatalytic activity than bare TiO2nanofibers under visible light irradiation. In addition, photocatalytic performance of the TiO2/GO composites nanofibers was enhanced with increasing the GO concentration in the composite nanofibers. The results presented herein provide new insights into TiO2/GO composites materials as high performance photocatalysts with potential uses in environmental remediation.
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