基于二氧化鈦納米管的光電材料制備與光催化應(yīng)用研究
發(fā)布時間：2018-09-09 09:17
【摘要】：近些年來,隨著我國經(jīng)濟的迅猛發(fā)展,能源的短缺,環(huán)境的污染,人民的生活、健康等問題越發(fā)嚴峻。本文是以提升二氧化鈦納米管(TiO_2 NTs)的光電性能及其滅菌應(yīng)用為研究方向,為實現(xiàn)將TiO_2 NTs材料應(yīng)用于有機污染物的去除和生物領(lǐng)域中,展開了基礎(chǔ)性的研究。自2001年以來,首次用陽極氧化法制備的TiO_2 NTs,引起了人們極大的興趣。TiO_2 NTs自身具有表面形貌均一、管徑管長可調(diào)控、高度定向、以及獨特的電學(xué)、光學(xué)性能。到目前為止,已經(jīng)有大量的研究表明,TiO_2 NTs材料在光催化及生物領(lǐng)域具有廣泛的使用價值和應(yīng)用前景。然而,TiO_2半導(dǎo)體材料禁帶寬度較高(金紅石型Eg=3.0 e V,銳鈦礦型Eg=3.2 e V),只對紫外光(390 nm)有吸收,并且吸收率僅為5%左右,大大限制了其對太陽光的有效利用。另外TiO_2半導(dǎo)體材料導(dǎo)電率也低,不會有效的傳遞光生電子,使光生電子和光生空穴進行復(fù)合,從而減少了其自身光電轉(zhuǎn)化效率。我們通過摻雜和修飾TiO_2 NTs材料,來提升其對光的利用和轉(zhuǎn)化效率,并將其應(yīng)用到有機污染物降解和生物殺菌的研究當中。主要研究內(nèi)容如下:(1)CuInSe_2/TiO_2 NTs的制備以及光電性能的研究:先用陽極氧化法制備TiO_2 NTs,剛開始鈦片表面上有大量的氧氣氣泡,之后會快速生成氧化鈦阻擋層,阻擋層會慢慢變厚,其厚度改變會影響電路中的電阻,導(dǎo)致回路電流密度也會發(fā)生相應(yīng)的變化。鈦片質(zhì)量的減少也說明了F-的化學(xué)溶解反應(yīng)非常顯著。再將合成的CuInSe_2的三元半導(dǎo)體材料修飾到TiO_2 NTs上,所得CuInSe_2/TiO_2 NTs復(fù)合材料對可見光有很好的吸收,進而彌補了TiO_2 NTs對可見光利用率低的缺陷。因為復(fù)合材料的光電流強度的增強,CuInSe_2/TiO_2 NTs材料展現(xiàn)了優(yōu)越的光催化性能。本文在不加外壓、可見光的條件下降解2,4-二氯苯氧乙酸(2,4-D),9-蒽甲酸(9-An COOH),對復(fù)合材料的光催化性能進行檢測,發(fā)現(xiàn)復(fù)合材料表現(xiàn)出很強的光催化降解效果。(2)Cd S/Zn Se/TiO_2 NTs的制備以及光電殺菌的研究:從能帶匹配原則出發(fā),選擇適當?shù)恼瓗О雽?dǎo)體材料與TiO_2 NTs組成復(fù)合材料。修飾窄帶半導(dǎo)體材料不僅可以提高復(fù)合材料對可見光的吸收,還可以促進光生電子和空穴的分離,從而提高復(fù)合材料的光電性能�；诖�,我們制備了窄帶半導(dǎo)體Cd S/Zn Se/TiO_2 NTs復(fù)合材料,研究其光電催化性能。Cd S和Zn Se納米顆粒修飾的TiO_2納米管復(fù)合材料對大腸桿菌表現(xiàn)出較好的光電殺菌效果。
[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.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ134.11;O643.36
本文編號：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.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ134.11;O643.36
【參考文獻】
相關(guān)期刊論文 前2條
1 ;A review on TiO_2 nanotube arrays:Fabrication, properties, and sensing applications[J];Chinese Science Bulletin;2010年Z1期
2 吳琛;李越湘;彭紹琴;呂功煊;李樹本;;S、La~(3+)共摻雜TiO_2的制備及其可見光下光催化制氫性能[J];西安交通大學(xué)學(xué)報;2008年07期
，本文編號：2231962
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