有机功能化纤蛇纹石纳米管的制备及其对重金属离子吸附性能研究
发布时间：2018-10-08 18:32
【摘要】：本文采用接枝法,以纤蛇纹石纳米管(ChNTs)为原料,3-巯基丙基三甲氧基硅烷和3-氨基丙基三甲氧基硅烷作为表面功能化试剂,制备了巯基功能化纤蛇纹石纳米管(ChNTs-SH)和氨基功能化纤蛇纹石纳米管(ChNTs-NH2)。通过X射线衍射(XRD)、傅立叶红外光谱(FTIR)、光电子能谱(XPS)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)及氮气吸附-脱附等现代化测试手段对功能化纤蛇纹石纳米管进行表征分析,并研究其对重金属离子的吸附性能。(1)表征分析显示,巯基和氨基成功地负载到纤蛇纹石纳米管表面。、接枝反应没有改变纤蛇纹石纳米管的骨架结构特征,但受表面负载功能基团的影响,其有序度、比表面积、孔径以及孔容都有所下降。(2)以巯基功能化纤蛇纹石纳米管为吸附剂系统地研究对重金属离子Pb(Ⅱ)和Cd(Ⅱ)的吸附性能。Pb(Ⅱ)和Cd(Ⅱ)在巯基功能化纤蛇纹石纳米管上的吸附主要受到pH和温度的影响,且拟二级动力学模型更适合模拟该吸附过程,Langmuir模型能较好的模拟该吸附等温数据。巯基功能化纤蛇纹石纳米管对Pb(Ⅱ)和Cd(Ⅱ)的吸附过程为自发的吸热过程,吸附过程不仅有纤蛇纹石纳米管对重金属的吸附,还有表面巯基官能团对重金属的络合。巯基功能化纤蛇纹石纳米管对重金属离子Pb(Ⅱ)、 Cd(II)和Cr(Ⅲ)具有选择吸附性,且吸附顺序为Pb(Ⅱ)Cd(Ⅱ)Cr(Ⅲ)。(3)氨基功能化纤蛇纹石纳米管吸附Pb(Ⅱ)受pH和温度的影响较大,拟二级动力学模型更适合模拟该吸附过程,Langmuir模型能较好的模拟该吸附等温数据,且吸附过程为自发的吸热过程。吸附过程不仅有纤蛇纹石纳米管对重金属离子的吸附,还有氨基官能团对重金属离子的络合。氨基功能化纤蛇纹石纳米管对重金属离子Pb(Ⅱ)、Cd(Ⅱ)和Cr(Ⅲ)具有选择吸附性,且吸附顺序为Cr(Ⅲ)
[Abstract]:In this paper, using chrysotile nanotube (ChNTs) as raw material, 3-mercapto propyltrimethoxy silane and 3-aminopropyl trimethoxy silane were used as surface functionalization reagents. Mercapto functional chrysotile nanotubes (ChNTs-SH) and amino functional chrysotile nanotubes (ChNTs-NH2) were prepared. The functional chrysotile nanotubes were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (XRD),) (FTIR), photoelectron spectroscopy (XPS),) (XPS), scanning electron microscope (SEM),) transmission electron microscope (TEM) and nitrogen adsorption-desorption. The adsorption properties of chrysotile on chrysotile nanotubes were studied. (1) characterization and analysis showed that sulfhydryl and amino groups were successfully loaded on the surface of chrysotile nanotubes, and the graft reaction did not change the skeleton structure of chrysotile nanotubes. But affected by the functional groups loaded on the surface, the order, the specific surface area, The pore size and pore volume decreased. (2) the adsorption properties of heavy metal ions Pb (鈪，
本文编号：2257833
[Abstract]:In this paper, using chrysotile nanotube (ChNTs) as raw material, 3-mercapto propyltrimethoxy silane and 3-aminopropyl trimethoxy silane were used as surface functionalization reagents. Mercapto functional chrysotile nanotubes (ChNTs-SH) and amino functional chrysotile nanotubes (ChNTs-NH2) were prepared. The functional chrysotile nanotubes were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (XRD),) (FTIR), photoelectron spectroscopy (XPS),) (XPS), scanning electron microscope (SEM),) transmission electron microscope (TEM) and nitrogen adsorption-desorption. The adsorption properties of chrysotile on chrysotile nanotubes were studied. (1) characterization and analysis showed that sulfhydryl and amino groups were successfully loaded on the surface of chrysotile nanotubes, and the graft reaction did not change the skeleton structure of chrysotile nanotubes. But affected by the functional groups loaded on the surface, the order, the specific surface area, The pore size and pore volume decreased. (2) the adsorption properties of heavy metal ions Pb (鈪，
本文编号：2257833
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