纳米二氧化钛及其喹吖啶酮复合材料的合成及光催化性能

发布时间：2018-11-09 16:18

【摘要】：二氧化钛具有特殊的半导体性质,应用广泛。作为一种新型功能材料,纳米二氧化钛材料被认为是目前最有前途的光催化剂。为了克服二氧化钛本身存在的一些不足,研究者们探索了多种方法以进一步改善其光催化性能,如改变二氧化钛形貌及对二氧化钛进行掺杂等。目前的研究表明,二氧化钛纳米管相对于二氧化钛纳米粒子及其他形貌的二氧化钛纳米材料来说,光催化性能更好。本文以二氧化钛纳米粒子为原料,合成了二氧化钛纳米管(TiNT)和具有层次结构的花型二氧化钛材料(HFT),并用喹吖啶酮这种具有高稳定性及优良光敏特性的颜料对TiNT改性,合成了喹吖啶酮@TiNT复合材料(QATi)。主要工作如下:(1)以锐钛型二氧化钛纳米粒子(TiNP)为原料,在强碱溶液中,通过水热法合成了HFT材料,并使用扫描电子显微镜(SEM),透射电子显微镜(TEM),X-射线衍射仪(XRD),傅立叶红外转换仪(FITR),热重分析仪(TG)等仪器对该材料进行了表征,探究了其对亚甲基蓝的吸附能力和紫外光下的光催化性能。结果表明,该样品是以一维纳米片为花瓣而形成的多层花状结构,显示出部分斜方晶Na_2Ti_3O_7晶型。在30分钟内,30 mg的花状材料对100 ml 20 mg/L的亚甲基蓝溶液的吸附率为85%;在90分钟时,降解率为99%。(2)以TiNP为原料,在强碱溶液中,用水热法合成了TiNT,采用多种手段对其进行了表征,并探究了该纳米管对亚甲基蓝的光催化降解能力。结果表明,所制备的材料为相互缠绕的纳米管,具有氢化钛酸盐的单斜晶体结构。在紫外光的照射下,TiNT对亚甲基蓝溶液的光催化性活性很高,在110分钟时,光降解率达到了99%,循环使用的效果也很理想。(3)在合成TiNT的基础上,我们利用水热法一步合成了喹吖啶酮@TiNT复合材料(QATi),并对样品进行了一系列的表征,研究了该复合材料的紫外及可见光光催化性能,探讨了合成条件对光催化性能的影响。结果显示,QA的加入没有改变纳米管的形貌及晶体结构,但由于QA和TiNT之间的协同效应及体系中存在的氢键网络结构,QATi复合材料的光吸收和光生电荷的转移及分离得到了极大的改善,显示出优异的光降解活性:紫外光照射下,80分钟内亚甲基蓝的降解率达到99.9%;可见光照射下,120分钟内亚甲基蓝的降解率达96.3%,且具有良好的循环使用性能。
[Abstract]:Titanium dioxide has special semiconductor properties and is widely used. As a new functional material, nano-TiO _ 2 is considered as the most promising photocatalyst. In order to overcome some shortcomings of titanium dioxide, researchers have explored various methods to further improve its photocatalytic performance, such as changing the morphology of titanium dioxide and doping titanium dioxide. Recent studies have shown that titanium dioxide nanotubes have better photocatalytic properties than titanium dioxide nanoparticles and other TIO _ 2 nanomaterials. In this paper, TIO _ 2 nanotubes (TiNT) and patterned TIO _ 2 (HFT),) were synthesized by using titanium dioxide nanoparticles as raw materials, and TiNT was modified with quinacridone, a pigment with high stability and excellent Guang Min properties. Quinacridone @ TiNT composite (QATi). Was synthesized. The main works are as follows: (1) HFT materials were synthesized by hydrothermal method in strong alkali solution using anatase TIO _ 2 nano-particle (TiNP) as raw material and (SEM), transmission electron microscope (TEM),) was used as scanning electron microscope (SEM). X- ray diffractometer (XRD), Fourier transform infrared transform instrument (FITR),) thermogravimetric analyzer (TG) and other instruments were used to characterize the material. The adsorption ability of methylene blue and photocatalytic activity under ultraviolet light were investigated. The results show that the sample is a multilayer flower-like structure with one-dimensional nanochip as the petal, showing partial obliquity square crystal Na_2Ti_3O_7 crystal form. Within 30 minutes, the adsorption rate of 30 mg flower-like material to methylene blue solution of 100 ml 20 mg/L was 85; At 90 minutes, the degradation rate was 99%. (2) TiNT, was synthesized by hydrothermal method in strong alkali solution with TiNP as raw material, and the photocatalytic degradation of methylene blue was investigated by various means. The results show that the materials are intertwined nanotubes with monoclinic crystal structure of hydrogenated titanate. The photocatalytic activity of TiNT to methylene blue solution was very high under ultraviolet light irradiation. The photodegradation rate reached 99% at 110min, and the effect of recycling was very good. (3) on the basis of synthesizing TiNT, Quinacridone @ TiNT composite (QATi), was synthesized by hydrothermal method and characterized by a series of characterization. The UV and visible photocatalytic properties of the composite were studied. The effect of synthesis conditions on photocatalytic performance was discussed. The results show that the addition of QA does not change the morphology and crystal structure of nanotubes, but due to the synergistic effect between QA and TiNT and the existence of hydrogen bond network structure in the system, The photoabsorption and photocharge transfer and separation of QATi composites have been greatly improved, showing excellent photodegradation activity: under UV irradiation, the degradation rate of methylene blue reaches 99.9% within 80 minutes; Under visible light irradiation, the degradation rate of methylene blue reached 96.3% within 120 minutes and had good recycling performance.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O643.36;O644.1

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