TiO_2及C/TiO_2纳米材料的结构设计与光催化特性研究
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摘要
TiO_2光催化剂因自身无毒、无害、无腐蚀性等优点，是最重要的一种光催化材料。碳纳米材料由于其独特的物理化学性质，受到了研究者的广泛关注。本文合成了TiO_2及C/TiO_2等不同结构的纳米材料，并对其光催化性质进行了研究，主要包括以下内容：
（1）用水蒸气辅助快速水解的方法制备了孔窄且分布均一的多孔TiO_2纳米球。
（2）用电化学方法在高纯水中制备出了具有荧光和上转换荧光性质的碳点，该碳点与TiO_2的复合物具有很强的光催化作用和强的光电流。
（3）水热碳化葡萄糖制备了碳负载TiO_2纳米粒子的复合物，该复合物具有高的光催化活性。
（4）以乙二胺为碳源和氮源，对TiO_2纳米粒子进行修饰和掺杂，制备了氮共掺杂的C/TiO_2复合物，该复合物有很强的光催化活性。
TiO_2based photocatalysts have been one of the most active topics inheterogeneous catalysis due to their great photocatalytic abilities, avirulence andharmlessness. Carbon nanomaterials with special electronic, mechanical, optical andchemical characteristics have attracted great interest, both from a fundamental point ofview and for future applications. In this dissertation, we focus on the research ofcomposition design and photocatalytic properties of the TiO_2and C/TiO_2nanomaterials.The main contents are as follows:
(1) Nanoporous TiO_2nanospheres with excellent visible light photocatalyticabilities and narrow pore size (11±1nm) distribution can be obtained via a rapid vaporassisted hydrolysis technique.
(2) High quality carbon nanodots (C-dots) with high purity were synthesizedthrough a mild, one-step electrochemical approach, without the assistance of anychemicals but only pure water presented. In addition, a novel photocatalyst (TiO_2/C-dots)was obtained by combining C-dots with TiO_2through an easy hydrothermal method.Remarkably, TiO_2/C-dots exhibited an excellent visible-light photocatalytic activity.
(3) Carbon-TiO_2nanohybrids (named as CTs) have been successfully prepared viaa mild, one-step hydrothermal approach in the presence of glucose. CTs exhibit anefficient environmental application such as photodegradation of toxic organic(rhodamine B, benzene) and inorganic (K2Cr2O7) pollutant.
(4) C/TiO_2nanohybrids co-doped by N were obtained by one step reaction andexhibited excellent photocatalytic performance.
（1）用水蒸气辅助快速水解的方法制备了孔窄且分布均一的多孔TiO_2纳米球。
（2）用电化学方法在高纯水中制备出了具有荧光和上转换荧光性质的碳点，该碳点与TiO_2的复合物具有很强的光催化作用和强的光电流。
（3）水热碳化葡萄糖制备了碳负载TiO_2纳米粒子的复合物，该复合物具有高的光催化活性。
（4）以乙二胺为碳源和氮源，对TiO_2纳米粒子进行修饰和掺杂，制备了氮共掺杂的C/TiO_2复合物，该复合物有很强的光催化活性。
TiO_2based photocatalysts have been one of the most active topics inheterogeneous catalysis due to their great photocatalytic abilities, avirulence andharmlessness. Carbon nanomaterials with special electronic, mechanical, optical andchemical characteristics have attracted great interest, both from a fundamental point ofview and for future applications. In this dissertation, we focus on the research ofcomposition design and photocatalytic properties of the TiO_2and C/TiO_2nanomaterials.The main contents are as follows:
(1) Nanoporous TiO_2nanospheres with excellent visible light photocatalyticabilities and narrow pore size (11±1nm) distribution can be obtained via a rapid vaporassisted hydrolysis technique.
(2) High quality carbon nanodots (C-dots) with high purity were synthesizedthrough a mild, one-step electrochemical approach, without the assistance of anychemicals but only pure water presented. In addition, a novel photocatalyst (TiO_2/C-dots)was obtained by combining C-dots with TiO_2through an easy hydrothermal method.Remarkably, TiO_2/C-dots exhibited an excellent visible-light photocatalytic activity.
(3) Carbon-TiO_2nanohybrids (named as CTs) have been successfully prepared viaa mild, one-step hydrothermal approach in the presence of glucose. CTs exhibit anefficient environmental application such as photodegradation of toxic organic(rhodamine B, benzene) and inorganic (K2Cr2O7) pollutant.
(4) C/TiO_2nanohybrids co-doped by N were obtained by one step reaction andexhibited excellent photocatalytic performance.
引文
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