玄武岩纤维/TiO_2复合材料的制备及表征

Preparation and characterization of basalt fibers/TiO_2 composite materials

TiO_2纳米粉体应用于光催化领域存在光吸收仅局限于紫外光区域、难以回收等缺点,因此,纳米TiO_2固定化和可见光改性成为光催化领域的两个研究热点.本文采用绿色环保的水热法,将TiO_2负载于玄武岩纤维载体上,在较低的温度下制备出一种新型的玄武岩纤维/TiO_2复合材料.使用XRD分析了复合材料的物相结构,采用SEM观测了复合材料的形貌,并对水热法合成其机理进行了分析.结果表明:150℃水热条件下、反应10 h合成的玄武岩纤维/TiO_2复合材料中,颗粒状的TiO_2涂层均匀包覆于玄武岩纤维表面,并没有改变玄武岩纤维结构,形成了一种具有核壳结构的新型玄武岩纤维/TiO_2复合材料,经过TiO_2修饰的玄武岩纤维对可见光有很好吸收.因此,玄武岩纤维/TiO_2复合材料是一种具有潜在应用价值的可见光催化材料.

Nano-TiO2 powder has some disadvantages in the photocatalytic fields, such as light absorption is only limited to UV region, difficult to recycling, et al, so immobilizing and visible-modifying nano-TiO2 become two research hotspots in this field. In this paper, TiO2 was loaded on the basalt fibers carriers, a novel basalt fibers/TiO2 composite material was synthesized by a green hydrothermal method at lower temperature. The phase structure of the samples was examined by X-ray diffraction, and the microstructure was examined by scanning electron microscope. The mechanism of hydrothermal technique was briefly discussed. The results show that the surface of basalt fibers was coated by a uniform TiO2 grains at 150 ℃ with reaction 10 h, and have no different phases structure, the composite materials are core-shell structures, the TiO2 modified basalt fibers had higher visible light absorption, so the obtained materials have potential application in the field of Visible-Light-Driven photocatalysts.