介孔复合材料的制备与其应用研究
发布时间：2019-03-24 15:27
【摘要】：二氧化硅介孔材料具有孔体积大、比表面积高、介孔孔道均匀等优点,在吸附及催化等方面具有广阔的应用前景。本论文采用水热共缩聚法,分别以十二烷基硫酸钠、十六烷基三甲基溴化铵和聚环氧乙烷-聚环氧丙烷-聚环氧乙烷三嵌段共聚物为模板剂,合成带有含氨基团的ASM、MCM-41-NH2、SBA-15-NH2三种二氧化硅介孔吸附材料。三种材料经过磷酸处理,得到含有磷酸基团的二氧化硅介孔吸附材料。通过扫描电镜(SEM)、傅里叶变换红外光谱(FT-IR)表征、比表面积及孔径分析(BET)、能谱仪(EDS)等分析手段对上述三种材料进行结构及性能表征,结果表明上述几种材料的比表面积较大,具有不同尺寸孔径,且存在氨基、磷酸基团等功能基团。共缩聚法合成带有氨基的ASM材料进行磷酸改性后的ASM-P材料对镧系金属La(Ⅲ)、Ce(Ⅲ)、Pr(Ⅲ)三价离子的吸附实验结果表明,ASM-P材料对镧系金属镧和铈的吸附能力对比ASM略有增强,吸附时间都稳定在30min左右。改性后的ASM-P材料在pH=4能达到最佳吸附效果,较改性前有所降低。ASM-P材料对三价金属的吸附能力明显优于二价金属。在多种材料对镧系金属Pr3+的吸附实验表明,ASM-P材料对Pr3+的吸附能力优于ASM及商用的MCM-41及SBA-15。用共缩聚氨基改性后磷酸嫁接的方式对MCM-41及SBA-15材料改性后,两种材料的吸附能力也都有了较大改观。为了扩大介孔材料的应用范围,采用羧甲基纤维素钠和聚乙烯醇进行了介孔材料粉末的成膜实验。并用SEM、TG等手段进行了成膜的性能表征,实验结果表明,介孔材料粉末在羧甲基纤维素钠及聚乙烯醇形成的基底上可以很好的分散成膜,具有较好的热稳定性。本文同时用改进的Hummers法进行了氧化石墨烯的制备,使用水合肼进行还原,并使用SEM等手段进行了表征。合成的氧化石墨烯具有良好的水溶液分散性,同时采用滴涂干燥方法能制备出低厚度氧化石墨烯薄膜。用上述的滴涂法制备氧化石墨烯薄膜与尖端导流自组装的聚苯乙烯小球光子晶体进行了复合,使用SEM、德拜环衍射,电化学工作站等手段进行了表征,结果表明此种纳米材料具有二维光子晶体结构,并具有较好的导电性。
[Abstract]:Silica mesoporous materials have the advantages of large pore volume, high specific surface area and uniform mesoporous channels, which have broad application prospects in adsorption and catalysis. ASM, with amino groups was synthesized by hydrothermal co-polymerization using sodium dodecyl sulfate, cetyltrimethylammonium bromide and poly (ethylene oxide)-poly (epoxypropane)-poly (ethylene oxide) triblock copolymer as templates. MCM-41-NH2,SBA-15-NH2 three silica mesoporous adsorption materials. Three kinds of materials were treated with phosphoric acid to obtain silica mesoporous adsorptive materials containing phosphate groups. The structure and properties of the three materials were characterized by scanning electron microscopy (SEM),) Fourier transform infrared spectroscopy (FT-IR), specific surface area and pore size analysis (BET), energy dispersive spectroscopy (EDS). The results show that the above-mentioned materials have large specific surface area, different pore sizes and functional groups such as amino group, phosphoric acid group and so on. Adsorption of lanthanide metal La (鈪，
本文编号：2446446
[Abstract]:Silica mesoporous materials have the advantages of large pore volume, high specific surface area and uniform mesoporous channels, which have broad application prospects in adsorption and catalysis. ASM, with amino groups was synthesized by hydrothermal co-polymerization using sodium dodecyl sulfate, cetyltrimethylammonium bromide and poly (ethylene oxide)-poly (epoxypropane)-poly (ethylene oxide) triblock copolymer as templates. MCM-41-NH2,SBA-15-NH2 three silica mesoporous adsorption materials. Three kinds of materials were treated with phosphoric acid to obtain silica mesoporous adsorptive materials containing phosphate groups. The structure and properties of the three materials were characterized by scanning electron microscopy (SEM),) Fourier transform infrared spectroscopy (FT-IR), specific surface area and pore size analysis (BET), energy dispersive spectroscopy (EDS). The results show that the above-mentioned materials have large specific surface area, different pore sizes and functional groups such as amino group, phosphoric acid group and so on. Adsorption of lanthanide metal La (鈪，
本文编号：2446446
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