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真空浸渍制备膨胀石墨基C/C复合材料及其甲醛吸附性能

, PP. 108-115

Keywords: 膨胀石墨基C/C复合材料,真空浸渍,孔结构,甲醛,官能团

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Abstract:

以蔗糖为炭源,磷酸为活化剂,采用真空浸渍法经炭化、活化制得膨胀石墨基C/C复合材料。采用SEM、氮气吸脱附法、TG和TEM等测试手段,研究了磷酸/蔗糖质量比(Xp)、蔗糖浓度对复合材料孔结构和比表面积的影响,利用FTIR和Boehm滴定法对复合材料表面的化学官能团进行表征,并考察了C/C复合材料对甲醛的吸附能力。结果表明:膨胀石墨基C/C复合材料含有大量的微孔、一定量的介孔和大孔,表面含有丰富的含氧官能团,有利于对甲醛极性分子的吸附。在Xp=1.0、蔗糖溶液浓度为30%(质量分数)时所制得的膨胀石墨基C/C复合材料比表面积最高,达到2112m2/g,孔容为1.08mL/g,其对甲醛的吸附量为854mg/g,较同工艺制备的活性炭提高了26.9%。

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