文档介绍：毕业设计(论文)
题目:反相胶束制备纳米CdS及可见光
降解有机有毒污染物
目录
摘要 (1)
前言 (2)
正文 (5)
1 选题背景 (5)
(5)
(5)
国内外研究进展 (6)
2 方案论证 (7)
CdS的反相胶束合成法 (10)
3 过程论述 (11)
实验主要仪器和试剂 (11)
实验方法 (12)
4 结果分析 (14)
XRD分析 (14)
CdS的电化学性质 (14)
CdS光催化活性对比 (16)
(19)
(·OH)的测定 (20)
H2O2跟踪测定 (20)
MG的深度矿化(氧化) (22)
(23)
5 小结 (23)
致谢 (24)
参考文献 (24)
反相胶束制备纳米CdS及可见光降解有机有毒污染物
摘要:本文采用CTAB/正丁醇/正庚烷/水四元反相体系和直接沉淀法制备纳米CdS。在可见光照射下,以CdS活化分子氧光催化降解孔雀绿(malachite green MG)为探针反应,探讨了反相体系不同水量对制备的纳米CdS光催化活性的影响,确定最佳水量ω([H2O]/[表面活性剂])为25时,制备的纳米CdS光催化活性最高,且反相胶束法制备的CdS活性明显高于直接沉淀法制备的CdS。利用X-射线衍射仪(XRD)对CdS的晶型、尺寸进行了初步表征,表征结果显示,反相胶束法和直接沉淀法制备的CdS均为立方闪锌矿型,水量25的CdS平均粒径约为9nm。以CdS可见光激发催化降解MG,通过分析紫外-可见光谱(UV-Vis)、红外光谱(FTIR)和总有机碳(TOC)的测定,发现在可见光(l≥420nm)和pH=7的条件下,以水量25制备的CdS在70min内可以使MG褪色完全,反应30h后MG的矿化率达到50%以上。采用循环伏安法(CV)和电化学交流阻抗法(EIS)研究了纳米CdS修饰电极的电化学行为,纳米CdS修饰电极对H2O2电化学还原有明显的催化作用。同时跟踪测定了在降解过程中H2O2和羟基自由基(·OH)的变化,表明CdS光催化机理涉及到·OH历程。
关键词:反相胶束法;CdS;光催化;降解;有机污染物;电化学行为
Preparation of CdS with Reverse Micelle Method and Photo-degradation of anic Pollutants
Abstract: In this article, CdS is prepared with reverse micelle method which used the CTAB/n-butyl alcohol/n-heptane/water system and direct precipitation method. The Photocatalytic degradation anic dye Malachit Green(MG) using CdS which activated molecular oxygen was used under Vis as probe reaction. Probe into different water volume conditions to make CdS with different photo-catalytic nature. the best water volume(ω) was 25. CdS prepared by reverse micelle method has higher activity than direct precipitation method. The characteristics of CdS was carried out using X-ray diffraction (XRD) spectroscopy, the results showed: the basic structure of product was mainly anatase phase, and the average size of CdS (ω=25) was about 9 nm. and use UV-Vis, FTIR, TOC analyzer to evaluate the optimum CdS prepared by reverse micelle method and direct precipitation method. The Photo-catalytic CdS/Vi