摘要
以有序介孔硅基材料(SBA1-5)为模板,丙烯酸低聚物为前驱物合成有序介孔结构的炭材料(OMC),并以化学方法将含氮基官能团嫁接在有序介孔炭的表面。利用扫描电子显微镜(SEM),透射电子显微镜(TEM),红外光谱(FT-IR),X射线衍射(XRD)和氮气吸附-脱附(BET)对介孔炭进行表征。结果表明:表面改性后有序介孔炭的结构发生一定变化,但孔道特征仍保持二维六方有序性。合成的有序介孔炭及经乙二胺表面改性后胺化有序介孔炭的比表面积、平均介孔直径、平均孔容积分别为607m2/g,4.1nm,0.62cm3/g和558m2/g,3.8nm,0.58cm3/g。对有序介孔炭及改性有序介孔炭进行的汞吸附实验,发现表面改性前后有序介孔炭对Hg(II)的吸附性能发生显著变化。嫁接胺基功能团后,其吸附容量增加一倍,表明胺基改性的OMC对汞有亲和作用。
An ordered mesoporous carbon （OMC） was synthesized by in situ polymerization of acrylic acid in an ordered silica template （SBA-15）, followed by carbonization and template removal. The OMC was subsequently functionalized with ethylenediamine by a combined treatment of nitric acid and thionyl chloride to obtain a functionalized ordered mesoporous carbon （FOMC）. This was characterized by SEM-EDS, XRD, FF-IR and nitrogen adsorption and evaluated for mercuric ion sorption from the aqueous phase. It was found that OMC and FOMC had an ordered mesoporous structure, with surface area, average pore size and pore volume of 607 m^2/g, 4.1 nm, 0.62 cm^3/g and 558 m^2/g, 3.8 nm, 0.58 cm^3/g, respectively. The treatments using nitric acid and thionyl chloride were effective to add the amine ligands to the OMC. Mercury sorption kinetics and equilibrium isotherms showed that the Hg （II） sorption capacity of FOMC was double that of OMC, suggesting a high affinity of the amine-containing FOMC for Hg （II） ions.
出处
《新型炭材料》
SCIE
EI
CAS
CSCD
北大核心
2008年第3期221-227,共7页
New Carbon Materials
基金
美国环境保护署(NCER-STARRD831071)
美国农业部(MOX-YANG)
美国国家科学基金(BES-0296109,BES0-093848)资助项目~~
关键词
有序介孔炭
表面改性
汞
吸附机理
Ordered mesoporous carbons
Surface modification
Mercuryions
Adsorption mechanisms
