以蔗糖为炭源、磷酸为活化剂,采用一步浸渍化学活化法制备了大比表面积的膨胀石墨/活性炭复合材料;采用SEM和比表面积分析仪对材料进行了表征,研究了磷酸与蔗糖质量比和活化温度对孔结构的影响.结果表明:大部分活性炭沉积在蠕虫状膨胀石墨的表面或以蛋壳状搭接在缠绕空间中,只有少量进入膨胀石墨内部;随着磷酸与蔗糖质量比和活化温度的增大,其比表面积和孔容先增大后减小,材料中微孔逐渐向中孔发展;在磷酸与蔗糖质量比和活化温度分别为0.9和350℃时其比表面积和孔容达到最大值,分别为1 978 m~2·g~(-1)和0.931 7 cm~3·g~(-1).
Expanded graphite-activated carbon composites (EG-Acs) were prepared by using one-step impegnation and chemical activation technology adopting sucrose as carbon source and H2PO4 as active agent.The composites were characterized by means of SEM and specific surface area analyzer.The effects of mass ratio of H3PO4 to sucrose and activation temperature on pore structure were investigated.The results show that most active carbon deposited on the surface of worm-like expanded graphite or filled in the entangled spaces in the shape of eggshell,only a few was in the expanded graphite.With the increase in the mass ratio of H3PO4 to sucrose and activation temperature,specific surface area and pore volume of the composites increased first and then decreased,the micropore grew to mesoporous gradually.The maximal specific surface area and pore volume were 1 978 m~2·g~(-1) and 0.931 7 cm~3·g~(-1),respectively,with the mass ratio was 0.9 and activation temperature was 350 ℃.
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