载钯二氧化钛纳米管的制备及其催化活性研究

摘要Cr(VI)是水中一种常见重金属污染物本文以水热法及后续焙烧处理制备出的TiO2纳米管（TNT）为载体，利用浸渍法制备出载钯TiO2纳米管（Pd/TNT）。以Pd/TNT为催化剂，研究了液相催化加氢催化还原Cr(VI)的过程。以P25为载体，通过相同条件制得载钯P25（Pd/P25），对比两者对Cr(VI)的催化还原效率，并阐明造成催化还原Cr(VI)差异的原因。
本论文进一步研究了pH值和催化剂使用量对Pd/TNT加氢催化Cr(VI)的影响，并采用XRD、TEM等方法对TNT、P25、Pd/TNT和Pd/P25进行表征。研究发现，反应体系的pH值对TNT的加氢催化活性有着较大的影响，由于在酸性条件下，促进了催化剂表面的羟基氧化成•OH自由基，故催化剂的加氢催化活性较高；此外，催化剂用量的增加可以明显加快Cr(VI)降解速率；催化剂比表面积对Cr(VI)加氢催化降解量亦有重要影响，比表面积越大，催化剂表面羟基浓度越高，对Cr(VI)的降解效率越高。5944
关键词 Pd /TiO2纳米管加氢催化Cr(VI)
毕业设计说明书（论文）外文摘要
Title Preparation of the TiO2 nanotube and the investigation of the effective catalytic reduction of Cr(VI) over TiO2 nanotube supported Pd catalysts
Abstract
Cr(VI) is commonly identified as heavy metal pollutant in aquatic environment. In present research, hydrogenation by TiO2 nanotube (TNT) supported Pd（Pd/TNT）and TiO2 nanotube(P25) supported Pd（Pd/P25）were investigated.
The research also systematically probed the interference of pH and the addition of catalysts with the effect of hydrogenation by TiO2 nanotube (TNT), while compare and analyse the difference and the explanation between TiO2 nanotube (TNT) supported Pd（Pd/TNT）and TiO2 nanotube(P25) supported Pd（Pd/P25). TiO2 nanotubes (TNT), on whose surface and that of P25 were deposited with Pd by immersion method, were prepared by hydrothermal treatment and subsequent calcined at 300℃. The synthesized TNT, Pd/TNT and Pd/P25 were characterized by XRD and TEM to investigate the structure and crystal form. The main conclusions are drawed as follows: The pH was largely involved in the hydrogenation by TiO2 nanotube (TNT), resulting from that the tendency of the oxidization of hydroxyl to •OH radical; Pd/TNT和Pd/P25The enhancement of the catalyst addition will lead to a soar of the degradation of Cr(VI); the BET of the catalyst plays a key role to the hydrogenation of Cr(VI) with that the larger the BET, the larger content of hydroxy on the surface of the catalyst and this will lead to a better performance of the efficiency of degradation of Cr(VI).
Keywords Pd/TiO2 nanotube, Catalytic hydrogenation, Cr(VI)
目录
第一章绪论   1
1．1 Cr(VI)污染现状及处理方法   1
1．2 加氢催化技术的基本原理   1
1．3 加氢催化反应的影响因素   2
1.3.1 加氢催化剂的性质   3
1.3.2 加氢催化反应条件   3
1．4 催化剂性质与制备及研究现状   4
1.4.1 催化剂性质与制备   4
1.4.2 TNT处理污水研究现状   5
1．5 本课题研究内容   6
第二章实验试剂、实验仪器及实验方法   6
2．1 实验试剂及主要实验仪器   6
2．2 催化剂制备   7
2.2.1 TiO2纳米管的制备   7
2.2.2 载钯TiO2纳米管（Pd/TNT）的制备   8
2.2.3 载钯P25（Pd/P25）的制备   8
2．3 表征方法   8
2.3.1 X射线衍射分析（XRD）   8
2.3.2 透射电子显微镜分析（TEM）   8 载钯二氧化钛纳米管的制备及其催化活性研究:http://www.youerw.com/huaxue/lunwen_3061.html