可见光催化论文：改性纳米二氧化钛的制备及对环境有机污染物的降解研究

1、 可见光催化论文：改性纳米二氧化钛的制备及对环境有机污染物的降解研究【中文摘要】纳米TiO2作为一种新型光催化剂,利用其光催化降解有机污染物具有无毒、无二次污染、经济等特点,是新一代环保技术发展的方向,但由于TiO2带隙能较宽只能吸收紫外光,极大地限制了其在环境净化领域的应用范围,因此通过改性技术使纳米TiO2在可见光区具有光催化活性已成为光催化研究领域的重要课题。本论文着重研究了纳米TiO2的离子掺杂和表面敏化改性技术及改性光催化剂在光催化降解有机污染物中的应用。分别制备了氮掺杂TiO2、经氧化【英文摘要】As a new photocatalyst, nano dioxide titani

2、um is non-toxic, no secondary pollution and economical in the aspect of photocatalysis degradation organics, which is the developing direction of new environment protection technology. However, due to the wide band gap of nano dioxide titanium, only can UV-light be absorbed, which highly restrained

3、the applied range of nano dioxide titanium in the field of depollution of environment, so, through modification technology to make nano dioxide titanium absorb visible light has been the important task in the field of photocatalysis. This program mainly studied the ion doping and surface sensitizati

4、on modification technology and the application of modification photocatalysts in organic photocatalysis degradation.N-doped TiO2, N-Fe co-doped TiO2 with a redox treatment and CuPcTs sensitized nanocrystalline TiO2 photocatalyst (CuPcTs/TiO2) were prepared respectively and were characterized by SEM

5、and XRD to analysis their surface topography and crystal form. Di-2-Ethyl Hexyl Phthalate (DEHP) and pentachloraphenol (PCP) were used as simulation pollutants to test the photocatalysis performance of the catalyst samples.The N single-doped titanium dioxide powder was prepared by hydrolysis-precipi

6、tation process with a series of different calcinations temperature. Through the analysis of characterization result and photocatalysis performance, the best calcinations temperature was set as 500 centigrade, the remove rate of DEHP by N-doped titanium dioxide reached to 84.33%. on the basis of conf

7、irming the optimum synthesization technology of N-doped titanium dioxide, we moved forward to synthesis the N-Fe co-doped titanium dioxide with a redox treatment. The co-doped photocatalysis was used to decompose pentachloraphenol, it was found, due to the synergistic effect and the change of ferrum

8、 crystal, the photocatalytic activity of N-Fe co-doped titanium dioxide with a redox treatment was enhanced obviously, the effect of photocatalysis was up to 86.8%.The CuPcTs sensitized TiO2 photocatalyst (CuPcTs/TiO2) was prepared by hydro-thermal synthesis process. Comparing to the unsensitized pu

9、re titanium dioxide, CuPcTs/TiO2 recombination nano photocatalyst had better photocatalytic activity, the remove rate for DEHP was increased obviously under visible light. It was found that the optimal concentration of catalyst was 0.4g/L, optimal pH level 5.0 and optimal irradiation time 50min, und

10、er these conditions, the removal rate of PCP reached up to 93.6%.【关键词】可见光催化 二氧化钛 改性 DEHP PCP【英文关键词】photocatalysis under visible light TiO2 modification DEHP PCP【目录】改性纳米二氧化钛的制备及对环境有机污染物的降解研究摘要5-6Abstract6-7第一章 前言8-271.1 引言81.2 TiO_2光催化的基本原理8-101.3 TiO_2改性研究的方法10-151.4 纳米光催化剂应用前景展望15-171.5 光催化测试目标物的选择17-251.6 课题研究的目标与内容25-27第二章 氮掺杂TiO_2的制备及对DEHP的光催化降解27-352.1 引言272.2 实验部分27-292.3 结果与讨论29-342.4 小结34-35第三章 氮-铁共掺TiO_2的制备及对PCP的光催化降解35-453.1 引言353.2 实验部分35-373.3 结果与讨论37-433.4 小结43-45第四章 酞菁铜敏化