Synthesis, structure and adsorption properties of bagasse-based carbon molecular sieves
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摘要: 以甘蔗渣为碳质原料、酚醛树脂与少量羧甲基纤维素混合物为黏合剂,通过二次炭化法制备甘蔗渣炭分子筛(Bagasse carbon molecular sieves,BCMS),并采用N2吸附-脱附、X射线衍射(XRD)、差热分析(DTA)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)以及吸附实验对其进行结构分析与性质表征。结果表明,BCMS以微孔为主,孔径大小主要集中在0.72nm,微孔体积为0.11cm3/g,比表面积为269m2/g;部分BCMS以晶体形式存在,具有五元环排列的微孔结构,晶粒尺寸为57.7 nm,属单斜晶系,空间群为C2/c(15),晶胞参数为a=2.0437nm,b=0.3497nm,c=1.0345nm,α=90.000°,β=106.439°,γ=90.000°;BCMS孔结构发达,具有特殊的“孔中孔”结构,对蔗汁中有色物质具有较强的吸附能力,其饱和吸附量为1.296g /g (色素/ BCMS)。Abstract: Bagasse-based carbon molecular sieves (BCMS) were synthesized by a two-stage carbonization method, using bagasse as the raw material, and phenol-formaldehyde resin and carboxymethyl cellulose as the binders. The BCMS were characterized by N2 adsorption, X-ray powder diffraction differential thermal analysis, scanning and transmission electron microscopy and adsorptive de-coloring tests. Results showed that the BCMS had mainly micropores with the size centered at 0.72 nm, a micropore volume of 0.11cm3/g and a Brunauer-Emmett-Teller surface area of 269m2/g. XRD showed that apart from the broad peaks at 2θ values of 23o and 44o, ascribed to amorphous carbon, there are peaks ascribed to a monoclinic single crystal belonging to C2/c(15) space group, with size of 57.7nm and cell parameters of a=2.0437nm,b=0.3497nm,c=1.0345nm, α=90.000°, β=106.439°, γ=90.000°. The BCMS had developed pores with a hierarchical structure, which afforded them a high adsorption capacity of 1.296g/g for coloring substances in a clear sugarcane liquor.
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Key words:
- Bagasse /
- Carbon molecular sieve /
- Pore strucure /
- Crystal structure /
- Adsorption properties
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