【作者】 张晶；

【导师】 张亚萍； 于濂清；

【作者基本信息】 中国石油大学 ， 材料科学与工程， 2011， 硕士

【摘要】 纳米二氧化钛作为一种新型的无机材料,具有无毒、化学性能稳定、高氧化性以及良好的光电转化和光催化性能。在催化治理环境问题、太阳能敏化电池等方面应用广泛。本论文主要对纳米二氧化钛的水热制备,铁、银元素改性及光催化处理污水等方面进行研究。水热法制备纳米二氧化钛和催化性能研究。以钛酸丁酯和乙醇作为反应前驱体,通过改变体系的PH值、水热温度、物料添加比例和顺序,实现了系列样品的制备。以X射线衍射(XRD)、透射电镜(TEM)、扫描电镜(SEM)等实验测试技术表征为基础,研究制备条件对产物晶型、大小和形貌的影响,以及对应催化性能的好坏。对产物进行光催化实验,甲基蓝溶液作为模拟污染物,通过催化实验结果进一步指导和优化制备过程。最后得出水热法制备纳米二氧化钛的最佳工艺参数。为了拓展纳米二氧化钛对可见光的利用率,对其进行掺杂改性研究。分别采用水热法和光沉积法制备掺铁、掺银的纳米二氧化钛。研究不同掺杂比例下样品的光催化性能。最终,得到最佳掺杂比例,掺杂样品在可见光下表现出很好的光响应。为使催化剂便于循环利用,初步探究磁性球负载纳米二氧化钛的制备及其光催化性能。本文的创新点:(1)掺杂样品的可见光相应波长拓展到了汞灯577nm。并且,在此波长下样品呈现出很好的光催化效果。(2)探索性研究磁性催化剂的制备及其催化活性,所得样品能够达到分离的目的,并且有一定光催化效果。更多还原

【Abstract】 Nano-TiO₂ is a new type of inorganic material, which is non-toxic, stable in chemical, high oxidizing, good photoelectric transformation and photocatalytic performance. It is widely used in environmental management and solar sensitization battery, etc. Preparing nano-TiO₂, doping iron and silver, and the photodegradation methylene blue by this novel catalyst were studied.Photocatalytic properties of nano-TiO₂ have been researched, which was prepared by hydrothermal method. The tetra butyl titanate and absolute ethanol were used as starting materials to prepare nano-titanium by hydrothermal method. By controlling the reaction conditions such as raw materials, temperature, PH, etc, we have obtained nano-titanium. On the basis of characterized by XRD, SEM, and TEM, the photocatalytic activities of samples were investigated. The phase, size and morphology of product were affected by different preparation conditions. Preparation process of catalyst was further guided by photocatalytic tests. In the end, the optimum preparation parameters were obtained.In order to further expand the utilization of sunlight, we studied doped-TiO₂. Iron and silver doped-TiO₂ were respectively prepared by hydrothermal and photodeposition method. We researched photocatalytic activities of samples,which were doped with different proportion. Eventually, we got the best doping ratio.Also, doping samples showed excellent response in visible light.The novel innovation achievements of submitted are mainly as follows:（1） Doping samples also show excellent response under Hg lamp 577nm irradiation.（2） We explorative study the preraration of magnetic catalytic. The samples can be separated, and have a certain of photocatalytic effect.更多还原