摘要
以聚甲基含氢硅氧烷(PMHS)和正硅酸乙酯(TEOS)为原料,在不同的PMHS:TEOS质量比条件下合成了一系列具有微/介孔硅基材料.N2吸/脱附表征显示该材料具有微/介孔双孔分布的结构特征和较高的比表面积,并且随着PMHS:TEOS质量比的变化而变化.其中,当PMHS:TEOS质量比为1:3时硅基微/介孔材料具有最大的比表面积,达到783m·2g-1.XRD表征结果显示,该材料是无定形材料.材料对二硫化碳(CS2)的吸附性能的研究结果表明,PMHS:TEOS质量比为1:3合成的硅基微/介孔材料对CS2的吸附量最大,静态吸附量达到762.76mg·g-1,动态吸附穿透时间达到35min.再生实验表明材料再生性良好,可重复使用。
Micro/mesoporous SiO2-based materials were synthesized with polymethylhydrosiloxane（PMHS） and tetraethoxysilane（TEOS） with different PMHS/TEOS mass ratios.The materials were characterized by N2 adsorption/desorption.The micropore volume was calculated by t-Plot method,and the miropore size distributions was calculated by DFT method.The characterization revealed that the synthesized materials had large specific surface area.The specific surface area changed with the PMHS/TEOS mass ratio.When the PMHS/TEOS mass ratio is 1：3,the materials reached the largest specific surface area of 783m2·g-1.Meanwhile,it was found that the SiO2-based materials had the bimodal pore structures（mircoporous and mesoporous）.The XRD diffraction patterns indicate that the micro/mesoporous SiO2-based materials are amorphous materials.The adsorption properties of the materials were investigated with carbon disulfide（CS2） as a probe molecule.The static adsorption results indicated that M3 had the highest adsorption capacity which was synthesized with the PMHS/TEOS mass ratio of 1：3.The equilibrium adsorption capacity of M3 reached 762.76 mg·g-1.Moreover,the dynamic adsorption properties of the materials were also investigated.Among these materials,M3 had the best dynamic adsorption property.The breakthrough time of M3 was 35min.Regeneration experiments indicated that the material had a good regeneration property.
出处
《环境化学》
CAS
CSCD
北大核心
2010年第6期1048-1053,共6页
Environmental Chemistry
基金
国家青年自然科学基金(20803089)资助项目
太原市科技项目创业创新专项(09122060)
关键词
微/介孔硅基材料
双孔分布
吸附
二硫化碳
SiO2-based micro/mesoporous materials
bimodal pore distribution
adsorption
carbon disulfide.
