Flexible and thermally stable SiO2-TiO2 composite micro fibers with hierarchical nano-heterostructure
Flexible and thermally stable SiO2-TiO2 composite micro fibers with hierarchical nano-heterostructure
复制标题
具有分级纳米异质结构的柔性热稳定SiO2-TiO2复合微纤维
DOI：
10.1039/c3ra43049a
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发表时间：
2013-01-01
期刊：
影响因子：
3.9
通讯作者：
Qiu, Jianrong
中科院分区：
文献类型：
--
作者：
Ma, Zhijun;Chen, Weibo;Qiu, Jianrong
具有二级分级结构的TiO 2基微/纳米纤维具有广泛的应用前景。然而，同时优化这些材料的柔性和热稳定性仍然是一个很大的挑战。在这项研究中，成功地制备和表征的TiO 2-SiO 2复合微米纤维具有高的灵活性和优异的热稳定性的报告。静电纺丝柔性SiO2纤维被用作支撑TiO 2纳米结构的支架。在SiO2纤维上依次包覆了多孔SiO2、金红石型TiO 2纳米颗粒和金红石型TiO 2纳米棒三层结构，形成了独特的核@多壳结构。这种精心设计的核@多壳TiO 2-SiO2纤维具有高柔韧性、优异的热稳定性、大比表面积和高孔隙率。此外，它们易于图案化成具有分级多孔结构的非织造膜，这在许多应用中是有前途的。以罗丹明B为模型有机污染物，评价了TiO 2-SiO2非织造膜的净水性能。在紫外光照射下通过简单的过滤实现了对水中罗丹明B的有效去除，并且仅通过煅烧方便地实现了膜的光催化功能从有机污染物中的再生。
TiO2-based micro/nano fibres with secondary hierarchical structure have been extensively studied concerning a wide range of applications. However, simultaneous optimization of the flexibility and thermal stability of these materials still remains a big challenge. In this investigation, the successful fabrication and characterization of TiO2-SiO2 composite micron fibers with both high flexibility and excellent thermal stability are reported. Electrospun flexible SiO2 fibers were used as the scaffold for supporting TiO2 nanostructures. Three distinguished layers of porous SiO2, anatase TiO2 nanoparticle and rutile TiO2 nanorods were muffled over the SiO2 fibers stepwise, forming a unique core@multi-shell architecture with hierarchical structure. Such elaborately designed core@multi-shell TiO2-SiO2 fibers present high flexibility, excellent thermal stability, large specific surface area and high porosity. Moreover, they are easy to be patterned into nonwoven film with hierarchically porous structure, which is promising for many applications. We evaluate the water purification performance of the TiO2-SiO2 nonwoven film with Rhodamine B as a model organic pollutant. Efficient removal of Rhodamine B from water was implemented via simple filtration under UV irradiation, and regeneration of the photocatalytic functionality of the film from organic contamination was conveniently realized merely through calcination.