基于二氧化钛纳米管的光电材料制备与光催化应用研究
发布时间：2018-09-09 09:17
【摘要】：近些年来,随着我国经济的迅猛发展,能源的短缺,环境的污染,人民的生活、健康等问题越发严峻。本文是以提升二氧化钛纳米管(TiO_2 NTs)的光电性能及其灭菌应用为研究方向,为实现将TiO_2 NTs材料应用于有机污染物的去除和生物领域中,展开了基础性的研究。自2001年以来,首次用阳极氧化法制备的TiO_2 NTs,引起了人们极大的兴趣。TiO_2 NTs自身具有表面形貌均一、管径管长可调控、高度定向、以及独特的电学、光学性能。到目前为止,已经有大量的研究表明,TiO_2 NTs材料在光催化及生物领域具有广泛的使用价值和应用前景。然而,TiO_2半导体材料禁带宽度较高(金红石型Eg=3.0 e V,锐钛矿型Eg=3.2 e V),只对紫外光(390 nm)有吸收,并且吸收率仅为5%左右,大大限制了其对太阳光的有效利用。另外TiO_2半导体材料导电率也低,不会有效的传递光生电子,使光生电子和光生空穴进行复合,从而减少了其自身光电转化效率。我们通过掺杂和修饰TiO_2 NTs材料,来提升其对光的利用和转化效率,并将其应用到有机污染物降解和生物杀菌的研究当中。主要研究内容如下:(1)CuInSe_2/TiO_2 NTs的制备以及光电性能的研究:先用阳极氧化法制备TiO_2 NTs,刚开始钛片表面上有大量的氧气气泡,之后会快速生成氧化钛阻挡层,阻挡层会慢慢变厚,其厚度改变会影响电路中的电阻,导致回路电流密度也会发生相应的变化。钛片质量的减少也说明了F-的化学溶解反应非常显著。再将合成的CuInSe_2的三元半导体材料修饰到TiO_2 NTs上,所得CuInSe_2/TiO_2 NTs复合材料对可见光有很好的吸收,进而弥补了TiO_2 NTs对可见光利用率低的缺陷。因为复合材料的光电流强度的增强,CuInSe_2/TiO_2 NTs材料展现了优越的光催化性能。本文在不加外压、可见光的条件下降解2,4-二氯苯氧乙酸(2,4-D),9-蒽甲酸(9-An COOH),对复合材料的光催化性能进行检测,发现复合材料表现出很强的光催化降解效果。(2)Cd S/Zn Se/TiO_2 NTs的制备以及光电杀菌的研究:从能带匹配原则出发,选择适当的窄带半导体材料与TiO_2 NTs组成复合材料。修饰窄带半导体材料不仅可以提高复合材料对可见光的吸收,还可以促进光生电子和空穴的分离,从而提高复合材料的光电性能。基于此,我们制备了窄带半导体Cd S/Zn Se/TiO_2 NTs复合材料,研究其光电催化性能。Cd S和Zn Se纳米颗粒修饰的TiO_2纳米管复合材料对大肠杆菌表现出较好的光电杀菌效果。
[Abstract]:In recent years, with the rapid development of economy, energy shortage, environmental pollution, people's life, health and other problems are becoming more and more serious. In this paper, the research direction is to improve the optoelectronic properties of titanium dioxide nanotubes (TiO_2 NTs) and its application in sterilization. In order to realize the application of TiO_2 NTs materials in the removal of organic pollutants and biological field, the basic research has been carried out. Since 2001, TiO_2 NTs, prepared by anodic oxidation method has attracted great interest. TiO2 NTs has its own uniform surface morphology, adjustable tube length, high orientation, and unique electrical and optical properties. Up to now, a large number of studies have shown that TiO2 NTs material has wide application value and application prospect in the field of photocatalysis and biology. However, TiO2 semiconductor material has high bandgap (rutile type Eg=3.0 e V, anatase type Eg=3.2 e V), only absorbs ultraviolet light (390 nm) and its absorptivity is only about 5%, which greatly limits its effective utilization of solar light. In addition, the conductivity of TiO_2 semiconductor materials is also low, which can not effectively transfer photogenerated electrons, so that photogenerated electrons and photogenerated holes can be recombined, thus reducing its own photoelectric conversion efficiency. We improve the efficiency of light utilization and conversion by doping and modifying TiO_2 NTs materials, and apply them to the study of organic pollutant degradation and biological sterilization. The main research contents are as follows: (1) the preparation of CuInSe_2/TiO_2 NTs and the study of its photoelectric properties: firstly, there are a lot of oxygen bubbles on the surface of TiO_2 NTs, at the beginning of the preparation by anodizing method, then the barrier layer of titanium oxide will be formed quickly, and the barrier layer will become thicker. The change of the thickness will affect the resistance of the circuit and cause the change of the current density of the circuit. The decrease in the mass of titanium sheet also shows that the chemical dissolution reaction of F-is very significant. Then the ternary semiconductor material of CuInSe_2 was modified to TiO_2 NTs, and the CuInSe_2/TiO_2 NTs composite material had good absorption of visible light, which made up the defect of low visible light utilization rate of TiO_2 NTs. Because of the enhancement of the photocurrent intensity of the composite material CuInSe2 / TiOs2 NTs shows excellent photocatalytic properties. In this paper, the photocatalytic properties of the composite materials were determined by the degradation of 2o 4- dichlorophenoxyacetic acid (2o 4-D) -9 anthracene acid (9-An COOH),) without external pressure and visible light. It was found that the composite showed strong photocatalytic degradation effect. (2) the preparation of Cd S/Zn Se/TiO_2 NTs and the study of photosterilization: according to the principle of energy band matching, the proper narrow band semiconductor material and TiO_2 NTs were selected as composite materials. The modification of narrow-band semiconductor materials can not only improve the absorption of visible light, but also promote the separation of photogenerated electrons and holes, thus improving the photoelectric properties of the composites. Based on this, we prepared narrow band semiconductor Cd S/Zn Se/TiO_2 NTs composites, and studied their photocatalytic properties. CD S and Zn Se nanoparticles modified TiO_2 nanotube composites showed good photosterilization effect on E. coli.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ134.11;O643.36
本文编号：2231962
[Abstract]:In recent years, with the rapid development of economy, energy shortage, environmental pollution, people's life, health and other problems are becoming more and more serious. In this paper, the research direction is to improve the optoelectronic properties of titanium dioxide nanotubes (TiO_2 NTs) and its application in sterilization. In order to realize the application of TiO_2 NTs materials in the removal of organic pollutants and biological field, the basic research has been carried out. Since 2001, TiO_2 NTs, prepared by anodic oxidation method has attracted great interest. TiO2 NTs has its own uniform surface morphology, adjustable tube length, high orientation, and unique electrical and optical properties. Up to now, a large number of studies have shown that TiO2 NTs material has wide application value and application prospect in the field of photocatalysis and biology. However, TiO2 semiconductor material has high bandgap (rutile type Eg=3.0 e V, anatase type Eg=3.2 e V), only absorbs ultraviolet light (390 nm) and its absorptivity is only about 5%, which greatly limits its effective utilization of solar light. In addition, the conductivity of TiO_2 semiconductor materials is also low, which can not effectively transfer photogenerated electrons, so that photogenerated electrons and photogenerated holes can be recombined, thus reducing its own photoelectric conversion efficiency. We improve the efficiency of light utilization and conversion by doping and modifying TiO_2 NTs materials, and apply them to the study of organic pollutant degradation and biological sterilization. The main research contents are as follows: (1) the preparation of CuInSe_2/TiO_2 NTs and the study of its photoelectric properties: firstly, there are a lot of oxygen bubbles on the surface of TiO_2 NTs, at the beginning of the preparation by anodizing method, then the barrier layer of titanium oxide will be formed quickly, and the barrier layer will become thicker. The change of the thickness will affect the resistance of the circuit and cause the change of the current density of the circuit. The decrease in the mass of titanium sheet also shows that the chemical dissolution reaction of F-is very significant. Then the ternary semiconductor material of CuInSe_2 was modified to TiO_2 NTs, and the CuInSe_2/TiO_2 NTs composite material had good absorption of visible light, which made up the defect of low visible light utilization rate of TiO_2 NTs. Because of the enhancement of the photocurrent intensity of the composite material CuInSe2 / TiOs2 NTs shows excellent photocatalytic properties. In this paper, the photocatalytic properties of the composite materials were determined by the degradation of 2o 4- dichlorophenoxyacetic acid (2o 4-D) -9 anthracene acid (9-An COOH),) without external pressure and visible light. It was found that the composite showed strong photocatalytic degradation effect. (2) the preparation of Cd S/Zn Se/TiO_2 NTs and the study of photosterilization: according to the principle of energy band matching, the proper narrow band semiconductor material and TiO_2 NTs were selected as composite materials. The modification of narrow-band semiconductor materials can not only improve the absorption of visible light, but also promote the separation of photogenerated electrons and holes, thus improving the photoelectric properties of the composites. Based on this, we prepared narrow band semiconductor Cd S/Zn Se/TiO_2 NTs composites, and studied their photocatalytic properties. CD S and Zn Se nanoparticles modified TiO_2 nanotube composites showed good photosterilization effect on E. coli.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ134.11;O643.36
【参考文献】
相关期刊论文 前2条
1 ;A review on TiO_2 nanotube arrays:Fabrication, properties, and sensing applications[J];Chinese Science Bulletin;2010年Z1期
2 吴琛;李越湘;彭绍琴;吕功煊;李树本;;S、La~(3+)共掺杂TiO_2的制备及其可见光下光催化制氢性能[J];西安交通大学学报;2008年07期
，本文编号：2231962
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