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摘要针对纳米零价铁（NZVI）易团聚和易被氧化的问题，提出以有序介孔碳（OMC）为基体制备载铁复合材料的研究思路。拟利用OMC的高比表面积、大孔容优势实现NZVI的高度分散，利用介孔基体的物理阻隔改善NZVI的安定性能。以苯酚-甲醛预聚体（PF）为碳源，F127为模板剂，经软模板法合成OMC作为载体，硫酸亚铁为铁源，经后浸渍-焙烧-液相还原制备出了负载型载铁有序介孔碳复合材料（NZVI/OMC）。采用XRD、N2吸附-脱附进行材料表征，以硝基苯（NB）为目标污染物开展了NZVI/OMC的还原转化研究。结果表明，负载型NZVI/OMC保持有序的介孔结构，铁物种以α-Fe0形式存在，NZVI均匀分散于碳基体中，粒径10~50nm。NZVI/OMC对于NB具有良好的去除性能，去除过程是其强吸附性能与高还原活性的协同作用结果，苯胺为最终产物。去除效果随投加量加大而升高，酸性条件宜于反应进行，初始浓度越大则材料去除能力发挥程度越高。5740
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关键词 有序介孔碳 纳米零价铁 吸附 还原
毕业设计说明书（论文）外文摘要
Title Synthesis of nanoscale zero-valent iron/ordered mesoporous carbon for application to nitrobenzene
Abstract
As nanoscale zero-valent iron (NZVI) possesses small size and significant reduction reactivity, NZVI may aggregate easily and be oxidized facilely, which limit its application. For these considerations, we proposed to design composite materials consisted of NZVI supported on ordered mesoporous carbon (OMC). OMC has the advantages in ordered meso-structrue, large surface area and big pore volume. OMC acted as support for NZVI may control its aggregation and oxidation which optimize its reactivity and stability. In this work, the synthesis route of NZVI/OMC composite includes the synthesis of OMC using phenol-formaldehyde resol (PF) polymerized in basic medium as carbon precursor and triblock copolymer F127 as template agent, incipient wetness impregnation of iron ion from ferrous sulfate, liquid phase reduction following previous calcination. The NZVI/OMC composite materials were characterized by X-ray diffraction and N2 adsorption/desorption. Nitrobenzene(NB) has been chosen as the objective pollutant to evaluate the synergistic effects of adsorption and reduction ability of NZVI/OMC. The results show that the NZVI/OMC composite maintained ordered mesoporous structure and iron species existed in α-Fe0 states and NZVI dispersed well on OMC. The removal action of NZVI/OMC for NB was a combined synergistic effect of adsorption capacity and significant reduction reactivity. The removal efficiency of NB by NZVI/OMC increased as the dosage of NZVI/OMC increased in acidic conditions as well as the concentration of NB increased.
Keywords Ordered mesoporous carbon; Nanoscale zero-valent iron; Adsorption; Reduction.
目 次
1 绪论 1
1.1 有序介孔碳材料 1
1.1.1 有序介孔碳材料的发展 1
1.1.2 有序介孔碳材料的应用 2
1.1.3 有序介孔碳材料的制备 2
1.2 有序介孔碳复合材料 4
1.2.1 有序介孔碳复合材料的应用 4
1.2.2 有序介孔碳复合材料的合成 4
1.3 纳米零价铁的应用及研究进展 6
1.3.1 纳米零价铁的还原性 6
1.3.2 纳米零价铁的制备 8
1.4 课题的提出及研究内容 9
2 实验 11
2.1 实验材料 11
2.1.1 实验试剂 11
2.1.2 实验仪器设备 11
2.2 实验内容 12