One-pot preparation of functionalized nanostructured carbons

Alexander M. Puziy, Olga I. Poddubnaya, Catherine A. Reinish, Mykola M. Tsyba, Luba I. Mikhalovska, Sergey V. Mikhalovsky

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Abstract

Functionalized nanostructured carbons were obtained by template method using sucrose as carbon precursor and silica gel SG60 as structure directing agent. To introduce acid groups into carbon a different amount of phosphoric acid was added to sucrose (impregnation ratio 0-1) before filling the pores of silica gel. After carbonization at 800 °C silica template was removed by dissolution in HF. Carbons were characterized by SEM/EDX, nitrogen adsorption at 77 K and acid-base titration. Pore size distributions (PSD) indicated that carbons obtained at impregnation (IR) of 0-0.75 have pores with size less than 4 nm due to crack during carbonization and activating action of phosphoric acid. Templated pores with 5.1 nm are observed in all carbons. PSD significantly changed at IR = 1 showing additional large mesopores of 8.2 nm. Acid-base titration revealed very high concentration of acid surface groups (4.1-4.7 mmol/g), significant amount of which (46 ± 3%) belongs to phosphate groups (pK = 2.3 ± 0.1). Another surface groups are weak carboxylic (pK = 5.9 ± 0.3), lactone and/or enol (pK = 7.2 ± 0.2, pK = 8.8 ± 0.3) and phenol groups (pK = 10.5 ± 0.3). SEM showed smooth carbon surface up to impregnation ratio 0.5 and increasing roughness at higher amount of phosphoric acid.

Original languageEnglish
Pages (from-to)599-604
Number of pages6
JournalCarbon
Volume49
Issue number2
DOIs
Publication statusPublished - Feb 1 2011

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ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

Cite this

Puziy, A. M., Poddubnaya, O. I., Reinish, C. A., Tsyba, M. M., Mikhalovska, L. I., & Mikhalovsky, S. V. (2011). One-pot preparation of functionalized nanostructured carbons. Carbon, 49(2), 599-604. https://doi.org/10.1016/j.carbon.2010.10.002