TiO2/N-graphene nanocomposite via a facile in-situ hydrothermal sol–gel strategy for visible light photodegradation of eosin Y
TiO2/N-graphene nanocomposite via a facile in-situ hydrothermal sol–gel strategy for visible light photodegradation of eosin Y
复制标题
DOI：
10.1016/j.materresbull.2014.07.047
复制
发表时间：
2014-12
影响因子：
5.4
通讯作者：
Yingliang Liu;Fuyun Pei;Ruijuan Lu;Shengang Xu;S. Cao
中科院分区：
文献类型：
--
作者：
Yingliang Liu;Fuyun Pei;Ruijuan Lu;Shengang Xu;S. Cao
为了提高TiO2/ n-石墨烯纳米复合材料在可见光照射下光降解污染物的光催化效率，采用原位水热溶胶-凝胶策略合成了TiO2/ n-石墨烯纳米复合材料。采用透射电镜（TEM）、x射线光电子能谱（XPS）、x射线衍射（XRD）和紫外-可见漫反射光谱对所制备的纳米复合材料进行了表征。结果表明，纯TiO2纳米粒子的平均直径约为6.70 nm，而通过原位水热溶胶-凝胶策略合成的TiO2/ n-石墨烯纳米复合材料的平均直径约为1 nm，并通过化学键固定在n-石墨烯纳米片上。在TiO2/ n -石墨烯纳米复合材料中，纯TiO2纳米粒子和化学锚定TiO2纳米粒子都呈现锐钛矿的晶体类型。与纯TiO2纳米粒子相比，TiO2/ n -石墨烯纳米复合材料的带隙发生了红移。在可见光照射下的光降解性能评价表明，n -石墨烯含量为5 wt%的纳米复合材料具有最佳的可见光降解性能。
TiO2/N-graphene nanocomposites are synthesized via a facilein-situhydrothermal sol–gel strategy in order to improve the photocatalytic efficiency for pollutant photodegradation under visible light irradiation. The as-prepared nanocomposites are respectively characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and UV–vis diffuse reflectance spectroscopy. Results indicated that neat TiO2nanoparticles have an average diameter about 6.70 nm while TiO2nanoparticles in TiO2/N-graphene nanocomposites synthesized throughin-situhydrothermal sol–gel strategy bear an average diameter of ∼1 nm and are anchored onN-graphene nanosheets via chemical bonding. Both neat TiO2nanoparticles and chemically anchored TiO2nanoparticles in TiO2/N-graphene nanocomposites take on the crystal type of anatase. The band gap of TiO2/N-graphene nanocomposites is red-shifted compared with neat TiO2nanoparticles. The evaluation of photodegradation performance under visible light irradiation suggested that the nanocomposite with 5 wt%N-graphene content has the best visible light photodegradation performance.