稻壳灰制备介孔分子筛的改性及其吸附性能研究
关键词 稻壳灰 MCM-41 改性 吸附
毕业设计说明书（论文）外文摘要
Title The modification of mesoporous molecular MCM-41 synthetized from rice husk ash as it’s silica source and their application to adsorption of 2,4-Dinitrotoluene
Abstract
Mesoporous MCM-41 was synthesized using rice husk ash (RHA) as the silica source and then it was modified by reacting with trimethylchlorosilane. These two kinds of material were characterized by X-ray diffraction (XRD), Scanning electron microscope (SEM), N2 adsorption-desorption and Fourier transform infrared spectroscopy (FTIR). Then they were used to adsorb 2,4-Dinitrotoluene from aqueous solution. Both Freundlich isotherm and Langmuir isotherm could be fitted well with the two kinds of material’s adsorption isotherms. Both the adsorption kinetics could be fitted with pseudo-second kinetic equation well. There was a positive correlation between the removal efficiency and the dosage of both kind of material. For MCM-41, the adsorption capacity was reduced with the increase of pH. But for modified MCM-41, the adsorption capacity was best at pH=7. Analysts believed that both physical adsorption and chemical adsorption exist in the adsorption process of the modified materials.
Keywords RHA MCM-41 modification adsorption
目 录
1 引言 1
1.1 2,4-DNT概述 1
1.2 MCM-41概述 1
1.2.1 MCM-41的特点 1
1.2.2 MCM-41的合成 1
1.2.3 MCM-41在吸附方面的应用 2
1.3 稻壳提取SiO2 3
1.3.1 稻壳的组成 3
1.3.2 稻壳制备SiO2的研究进展 4
1.4 本文的工作 5
2 实验部分 6
2.1 仪器设备 6
2.2 实验试剂 6
2.3 检测方法 6
2.4 材料的制备 6
2.4.1 RHMCM-41的合成 6
2.4.2 CH3-MCM-41的制备 7
2.5 材料的表征 7
2.5.1 X-射线粉末衍射分析 7
2.5.2 低温N2吸附-脱附 7
2.5.3 红外光谱分析 7
2.5.4 扫描电镜分析 8
2.6 吸附实验 8
2.6.1 吸附动力学 8
2.6.2 吸附等温线 8
2.6.3 pH的影响 8
2.6.4 投加量的影响 8