纳米晶二氧化钛光催化薄膜的制备技术及表征

论述了纳米TiO2的光催化原理以及影响其光催化活性的主要因素；综述了近年来二氧化钛纳米晶光催化薄膜的制备技术和表征方法的研究成果，并对二氧化钛纳米晶光催化薄膜技术的发展方向进行了展望。     

银纳米颗粒负载TiO2复合薄膜的光催化活性及其光电流性质

制备了3种不同粒径的Ag纳米颗粒，将它们分别掺入二氧化钛溶胶，制备成复合二氧化钛薄膜，利用TEM测定了Ag粒子的大小，测量TiO2复合膜的光电流，以亚甲基蓝降解反应评价了Ag／TiO2薄膜的光催化活性，结果表明，负载不同粒径Ag纳米粒子后，TiO2薄膜的光电流和光催化活性均得到一定程度的提高。当负载平均粒径6.9nm的Ag粒子后，薄膜具有最高的光电流和最强的光催化活性。     

纳米二氧化钛光催化性能的应用进展研究

纳米二氧化钛具有强的光催化活性和强的氧化性,能利用紫外光降解很多有害的有机物质、甚至有毒的物质。本文介绍了锐钛型二氧化钛薄膜的晶体结构、光催化机理,和提高光催化活性的方法。综述了其催化性能的改进方法以及应用研究的进展。介绍了其光催化性能的应用,指出纳米二氧化钛光催化技术的理论基础和应用研究的发展潜力。     

Fe^3＋／TiO2多孔纳米薄膜的制备与光催化活性的研究

本研究采用溶胶—凝胶法制备含铁离子的二氧化钛多孔纳米薄膜，并将其作为光催化剂，光降解反应结果表明，含铁二氧化钛复合纳米薄膜的光催化活性明显提高，光电化学研究表明，铁离子可以形成电荷陷阱，促进空穴的界面传递反应，从而提高了光催化活性。     

纳米二氧化钛管阵列的制备及其光催化氧化降解甲基橙性能的研究

本文采用电化学阳极氧化法制备了管径为90—150nm的纳米管阵列。采用SEM和XRD对制备的二氧化钛纳米管阵列进行了表征。考察了焙烧温度对阳极氧化法制备纳米二氧化钛管阵列晶形结构的影响。将所制备的纳米管用于光催化降解甲基橙反应,考察了其在通气和不通气条件下光催化降解甲基橙的性能。结果显示：在550℃下焙烧的纳米管阵列具有良好的催化活性;反应器中通氧气可以提高纳米二氧化钛对甲基橙的光催化活性。     

二氧化钛薄膜的制备及其对光催化氧化微量丙酮气的影响

采用浸渍——提拉法将二氧化钛溶胶附着在玻璃板上制备了纳米二氧化钛薄膜。通过热重分析及TEM测试,确定了二氧化钛薄膜适宜的煅烧温度为550℃。纳米粒子为类圆形,颗粒分布均匀。考察了影响二氧化钛光催化性能的因素,确定出钛酸四丁酯、冰醋酸、水和乙醇的适宜摩尔比为1∶5∶6∶18。XRD分析结果表明,二氧化钛样品中包含有锐钛型和金红石型的晶型结构,该晶型结构有利于提高其光催化性能。     

二氧化钛功能薄膜研究发展与应用

二氧化钛薄膜在紫外光照射下的光催化活性和亲水性吸引了许多科学工作者对其进行了大量的研究．本文对近年来二氧化钛功能薄膜的研究发展与应用作了简要介绍，同时也对研究中存在的问题和将来研究发展的方向进行了简单评述.     

水处理领域基于电沉积的TiO2光催化材料进展

通过电沉积技术在金属基体上制备金属/TiO2纳米颗粒复合膜或在TiO2纳米管电沉积负载金属纳米颗粒和纳米半导体复合材料是制备应用于水处理领域优良光催化性能和宽光谱吸收响应的TiO2光催化复合材料的有效途径.近年来,TiO2光催化复合材料电沉积制备取得较大进展.本文综述了水处理领域基于电沉积技术TiO2光催化复合材料的研究进展,包括光催化机理、电沉积制备过程、结构特征和光催化性能,最后阐述了该类材料面临的挑战以及未来的发展方向.     

纳米二氧化钛薄膜制备方法研究进展

二氧化钛纳米晶薄膜优异的性能使其成为研究焦点,制备二氧化钛薄膜有着重要的现实意义。介绍了近年来国内外二氧化钛薄膜制备技术的研究进展,主要涉及高活性二氧化钛光催化薄膜的制备(制备方法包括溶胶-凝胶法、丝网印刷法、激光化学气相沉积法、水热结晶法、电泳法等),负载二氧化钛薄膜常用的载体,以及在环境保护等方面的应用研究现状,并指出以后的研究方向。     

PET基二氧化钛光催化涂层的制备及性能研究

采用旋涂法在聚对苯二甲酸乙二醇酯(PET)薄膜基材上制备出二氧化钛光催化涂层。为制备纳米二氧化钛(TiO_2)粒子富集于涂层与空气界面处的光催化涂层,采用偶联剂1H,1H,2H,2H-全氟辛基三乙氧基硅烷对纳米TiO_2粒子进行了表面氟化改性。采用SEM、紫外-可见分光光度计和接触角测定仪对PET基光催化涂层的结构进行了表征。结果表明,所制备的光催化涂层厚度约为4~6μm,且在可见光区具有极高的透明性。以甲基橙为目标污染物考察了光催化涂层的光催化活性,结果表明,含有氟化纳米TiO_2粒子的光催化涂层比含有纯纳米TiO_2粒子的光催化涂层具有更高的光催化活性,纳米TiO_2粒子表面氟化改性使纳米TiO_2粒子富集于涂层与空气界面处,这种粒子的分布状态有利于光催化活性的提高。     

Remarkably enhanced photocatalytic activity by nickel nanoparticle deposition on sulfur-doped titanium dioxide thin film

To enhance the photocatalytic performance of titanium dioxide, the structures of both bulk and surface were modified. Doping of sulfur atoms to be substituted for lattice oxygen atoms of titanium dioxide was carried out to extend the light absorption by atmosphere-controlled pulsed laser deposition, which allows direct preparation of impurity-included thin film such as sulfur-doped titanium dioxide. On the other hand, to enhance the surface catalytic reaction, nickel nanoparticles were deposited at the thin film substrate by chemical vapor reductive deposition method, which is a novel preparation technique of metallic nanoparticles on the substrate surface. Obtained sulfur-doped titanium dioxide was found to possess sensitivity to visible light with the wavelength up to 550 nm, indicating the photocatalytic activity in visible region. Sulfur doping induced the dye degradation activity under visible light irradiation. When nickel nanoparticles were deposited, a remarkable enhancement of the hydrogen evolution activity through ethanol decomposition of more than 20 times as much as unmodified titanium dioxide thin film was accomplished. In addition, the stability of sulfur atom doped into titanium dioxide structure was investigated.     

Photocatalytic treatments on dental mirror surfaces using hydrolysis of titanium alkoxide

Anatase titanium dioxide (TiO₂) photocatalytic thin films were directly formed on glass slide and commercial dental mirror substrate surfaces by a hydrolysis of titanium alkoxide, and the hydrophilicity, the degree of oxidizing power and the transparency of the anatase TiO₂-coated substrate surfaces. The contact angles of water and the decomposition rates of methylene blue on the anatase TiO₂ photocatalytic thin films improved with the increasing duration of a tetraethyl orthotitanate (TEOT) hydrolysis, but they hardly changed for the longer duration. The reflectance of anatase TiO₂ photocatalytic thin films coated on glass slide substrate surfaces was higher as the duration of a TEOT hydrolysis increased. Similar tendencies concerning hydrophilicity and transparency were recognized in cases of commercial dental mirror substrate surfaces. A hydrolysis of titanium alkoxide obtained superhydrophilic and antibacterial treatments with excellent transparency on commercial dental mirror substrate surfaces.     

溶胶-凝胶法制备二氧化钛薄膜的研究进展

光催化净化空气是一项造福人类的绿色环保技术。TiO₂薄膜化是光催化技术实用化的关键。介绍了近几年来溶胶-凝胶法制备TiO₂薄膜光催化净化空气的研究进展,对溶胶-凝胶法制备TiO₂薄膜的各种影响因素进行了分析,并探讨了提高TiO₂薄膜光催化能力的途径及其相关的光催化反应系统。     

纳米TiO2薄膜制备方法的研究进展

纳米二氧化钛以其优异的化学、物理性能受到关注。薄膜是纳米二氧化钛的重要形式,制备纳米二氧化钛薄膜具有重要意义和很好的应用前景。依据制备工艺中温度的要求,对制备纳米二氧化钛薄膜的方法进行了概述,高温制备的工艺主要有溶胶-凝胶法、水热法、气相沉积法,低温制备工艺主要有电泳沉积法、紫外光照射法、电化学制备法、模板自组装制备法。     

载银TiO2薄膜制备及其光催化灭菌性能

在硫酸电解液中,用阳极氧化法在纯钛表面制备了纳米多孔TiO₂薄膜,并通过光沉积法进行了载银修饰。采用XRD、SEM对薄膜的形貌与相结构进行了表征,并考察了电流密度、电压和电解液浓度等对生成的TiO₂薄膜光催化灭菌性能的影响。结果表明：TiO₂薄膜由锐钛矿型和金红石型组成。随电压升高,金红石型的含量逐渐增多,微孔孔径增大,在电流密度为150 mA•cm^-2时,分别由120 V时的19%和93 nm增加到180 V时的96%和283 nm。电流密度的适当增大和适量的载银修饰有助于提高TiO₂薄膜光催化灭菌性能。在1 mol•L^-1硫酸溶液中,140 V/150 mA•cm^-2条件下制备的TiO₂薄膜,经3 g•L^-1硝酸银溶液中载银修饰后灭菌效果最佳。     

复合二氧化钛负载膜降解十二烷基苯磺酸钠的研究

以玻璃珠为载体,用溶胶-凝胶法制备二氧化钍和三氧化二钕复合二氧化钛膜对水溶液中的十二烷基苯磺酸钠进行了固定相光催化氧化实验。研究了复合膜的紫外-可见光透过性能和二氧化钍与三氧化二钕的掺杂量、十二烷基苯磺酸钠水溶液的pH值等因素对光解率的影响。结果表明,二氧化钍和三氧化二钕复合二氧化钛负载膜的光催化活性显著提高且组分质量比存在最佳值。当二氧化钍与二氧化钛的质量比为0.02,三氧化二钕与二氧化钛的质量比为0.01时,最高光解率分别为同样条件下二氧化钛的2.3倍和1.6倍。     

The correlation between the interference colour and growth procedure of anodic titanium dioxide nanotube arrays

Titanium dioxide nanotube arrays were anodised from titanium foils in an aqueous electrolyte solution of hydrofluoric acid. The formed oxide showed visually different colours owing to light interference in the titanium dioxide layer. The behaviour of interference colour in anodic titanium dioxide film was investigated by varying anodisation parameters such as the applied voltage and the anodisation time. The morphologies and the crystalline phases of anodised samples were studied on a field emission scanning electron microscope and X‐ray diffractometer. The correlation between the interference colour and growth procedure of anodic titanium dioxide nanotube arrays was studied. The anodic films prepared under different conditions consisted of a compact oxide film with a nanoporous/tubular structure upon/beneath it. The crystalline phase of the anodic oxide layer was amorphous. The optical properties of the oxide film were investigated on a spectrophotometer. Optical interference could be detected in compact oxide layers when the thickness of the titanium dioxide was as small as 70 nm. In general, the interferences of the nanoporous/tubular structures were lower than those for compact structures. The empirical colour properties were estimated by the L*a*b* system. The relationships between the interference colour of anodic titanium dioxide film and its thickness and morphology are discussed.     

搪瓷表面TiO2薄膜的制备和光催化性能表征

以搪瓷表面为载体,在常温下采用溶胶-凝胶法制备二氧化钛(TiO2)薄膜,研究使用未添加聚乙二醇(PEG)的溶胶和添加少量PEG的溶胶制备出的薄膜在催化性能上的区别.结果表明,薄膜在450℃热处理1h后,具有完整的锐钛矿相和良好的光催化性能;使用添加少量PEG的溶胶制备的薄膜,其光催化能力更好.