水热碳化法制备单分散碳微球

Mono-dispersed Carbonaceous Spheres Prepared by Hydrothermal Carbonization Method

以蔗糖作为碳源,采用水热碳化法制得粒径均匀且产率高的碳微球,研究了聚丙烯酸钠(PAANa)、聚乙烯吡咯烷酮(PVP)和聚异丁烯顺丁烯酸酐(ISOBAM)为分散剂时对碳微球合成的影响。结果表明:不添加分散剂时,随着蔗糖浓度的增加,碳微球的团聚现象变得更加明显,但其产率也相应升高。当分散剂PAANa的加入量为0.5%和1.5%(质量分数,下同)时,在蔗糖浓度较大的情况下(0.7 mol/L),可制备出平均粒径分别为1.6和0.23μm的单分散碳微球。而PVP和ISOBAM作保护剂时的分散效果不理想。

Carbonaceous spheres with high yield and narrow particle size distribution were prepared by hydrothermal carbonization process using sucrose as a carbon source and sodium polyacrylate(PAANa), polyvinyl pyridine(PVP) and polyethylene maleic anhydride(ISOBAM) as dispersants. The effects of the type and content of these dispersants on the preparation of carbonaceous spheres were investigated. The results show that for the sample without any dispersants, the yield of carbonaceous spheres increases with sucrose concentration increasing; nevertheless, significant aggregation is also observed in the samples. Using 0.5 wt% and 1.5 wt% sodium polyacrylate(PAANa) as dispersants, carbonaceous spheres with an average diameter of 1.6 and 0.23 μm can be prepared in 0.7 mol/L sucrose, respectively. Polyvinyl pyridine(PVP) and polyethylene maleic anhydride(ISOBAM) is hardly effective in the preparation of carbonaceous spheres with small size and narrow particle size distribution by this method.