Synthesis, Characterization And Application Of Nitrogen-Containing Porous Carbon Materials

Porous carbons have been widely used as adsorbents, catalyst supports and electrode materials due to their high specific surface area and large pore volume, wide spread raw sources, low cost, mechanical stability and reusable. In generally, porous carbons material was prepared at high temperature and has less functional groups on its surface. Porous carbons was generally characterized by physical adsorption, so the adsorption quantity is low and the adsorption rate is slow.Nitrogen-containing porous carbon materials not only have the general characteristics of porous carbon materials, but also a advantage of fast adsorption rate and high adsorption quantity. Porous carbon materials with nitrogen doping obtained from nitrogen-rich carbon precursor have a more broad application prospects because of its unique structure and surface properties. Porous carbon materials with nitrogen show unique advantages in adsorption field. It is of great importance to synthesize nitrogen porous carbon materials with excellent adsorption performance to removal the heavy metal ions (such as chromium ion and lead ion) and CO2.In this paper, with melamine of rich nitrogen and conjugate structure as the main raw material, using the simple sol-gel synthesis method, prepared melamine formaldehyde resins. After adding KOH of different proportions, the mesopore carbon materials with high specific surface area (1854m2/g) and large pore volume (0.82cm3/g) were prepared. The physical and chemical properties of the porous carbon materials were characterized by N2-physical adsorption, SEM, TG, FTIR, and using it to removal the chromium ion and lead ion as adsorbent. The results showed that MF-2-800showed best adsorption rate and adsorption properties. The adsorption capacity of Cr(VI) and Pb(II) by MF-2-800reached to146.1mg/g and116.9mg/g within1h in the25℃, respectively. In addition, the selective adsorption experiments shows that the porous carbon materials have higher adsorption performance to chromium ion when the ph is2, while the ph is6, the adsorption performance to lead ion is better.In addition, with cellulose as the main raw material, urea as nitrogen source, KOH as activator, synthesized microporous nanosheet with high specific surface(1854m2/g) area and large pore volume(0.82cm3/g), The nitrogen-containing groups are incroporated into carbon matrix through urea decomposition and mainly existed as pyridine-like, pyrrole-like and graphite-like nitrogen species. Unique compositional and structural features endow the nitrogen-doped porous carbon nanosheets with superior CO2adsorption performance of5.8mmol/g in the0℃.