磁性介孔碳的制备表征及其在甲基橙吸附去除研究中的应用

摘要：甲基橙是一种红色偶氮染料，对人和动植物都有很大的危害。含有甲基橙的染料废水具有色度高、稳定性强、难降解的特点，因此研究染料废水中甲基橙的去除具有一定的意义。本文以Fe(NO3)3•9H2O为前驱体，壳聚糖作为碳源，采用水热法合成磁性介孔碳材料，并将其应用于甲基橙染料的吸附去除研究中。采用的表征仪器有比表面积分析仪（BET）、 ZATA 电势仪、红外色谱仪(IR)、透射电子显微镜（TEM）和X-射线衍射仪(XRD)，结果显示磁性颗粒成功引入介孔碳中。考察了 pH、初始浓度和超声时间对甲基橙吸附容量的影响，结果显示，当 pH 为 4 时，甲基橙初始浓度为 110 mg•L-1时，超生时间为 60 min时，吸附效果最好。采用 Langmuir吸附等温线进行热力学方程拟合，得其最大吸附容量为210 mg•g-1。动力学研究结果表明，吸附过程服从二级动力学吸附模型，说明该吸附过程由速率限制步骤控制。 37278
毕业论文关键词：磁性介孔碳材料；吸附；甲基橙
Synthesis and Characterization of Magnetic Mesoporous Carbon Composite and Its Applications for the removal of Methyl Orange
Abstract：Methyl orange is a kind of red azo dye, which is harmful to people and animals and plants. The color of the dye containing methyl orange is high and stable and it’s difficult to degrade. Methyl orange dye waste water seriously pollutes soil. In this paper, the magnetic nanoparticles coated with carbon were synthesized using Fe(NO3)3•9H2O as a precursor, chitosan as carbon source and were used for the removal of methyl orange. The Magnetic Mesoporous Carbon Composites were characterized by balanced-emitter transister (BET), Fourier transmission infrared spectroscopy (FT-IR), transmission electron microscope (TEM), and ZATA potential meter and X-ray diffractomer (XRD). The results showed that the magnetic particles were successfully introduced into the mesoporous carbon. The effects of pH, initial concentration of methyl orange and adsorption time on the adsorption quantity of methyl orange were investigated, respectively. The results showed that the best adsorption performance could appear at a condition that pH=4, the initial concentration of methyl orange was 110 mg•L-1 and adsorption time was 60 minutes. The maximum adsorption capacity calculated from Langmuir isotherm was 210 mg•g-1..Kinetics studies showed that the adsorption process obeyed a second-order kinetic model, which indicates that the adsorption process is controlled by the rate-limiting step.
Key words: Magnetic Mesoporous Carbon Composite；Adsorption；Methyl orange
目录
摘要   3
关键词 ... 3
Abstract . 3
Key words . 3
引言   3
1 材料与方法 ... 4
1.1 仪器与试剂 ... 4
1.1.1 实验仪器 .. 4
1.1.2 试剂 ... 4
1.2 材料的制备 ... 5
1.3 实验方法   5
1.3.1 吸附实验 .. 5
2 结果与分析 ... 5
2.1 材料的表征 ... 5
2.1.1 透射电子显微镜图谱 ... 5
2.1.2 傅里叶变换红外光谱图 ... 6
2.1.3 X 射线衍射图谱 ... 7
2 1.4 比表面积及孔径测定 ... 7
2.2 吸附性能的研究 .. 7
2.2.1 pH 值对吸附容量的影响 .. 7
2.2.2 初始浓度对吸附容量的影响 . 8
2.2.3 超声时间对吸附容量的影响 . 9
2.2.4 吸附动力学 . 9
2.2.5 吸附热力学 ... 10
3 讨论 ... 10
3．1 结论 ... 10
3．2 展望 ... 10
致谢 .. 11
参考文献：    11 磁性介孔碳的制备表征及其在甲基橙吸附去除研究中的应用:http://www.youerw.com/huaxue/lunwen_36008.html