One-pot preparation of functionalized nanostructured carbons

Mesoporous nanostructured carbons with surface acidic functional groups were prepared in one step by a combination of template technique and phosphoric acid activation using silica template and sucrose. Surface groups of carbons consist of phosphate groups (46%) and oxygen-containing groups while po...

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Bibliographic Details
Published in:	Carbon (New York) Vol. 49; no. 2; pp. 599 - 604
Main Authors:	Puziy, Alexander M., Poddubnaya, Olga I., Reinish, Catherine A., Tsyba, Mykola M., Mikhalovska, Luba I., Mikhalovsky, Sergey V.
Format:	Journal Article
Language:	English
Published:	Kidlington Elsevier Ltd 01-02-2011 Elsevier
Subjects:	Carbon Chemistry Colloidal state and disperse state Cross-disciplinary physics: materials science; rheology Exact sciences and technology Fullerenes and related materials; diamonds, graphite General and physical chemistry Impregnation Materials science Nanostructure Phosphoric acid Physics Porosity Porous materials Silica gel Specific materials Sucrose Surface chemistry Surface physical chemistry One pot reaction Porous materials Roughness Phosphate group Saccharose Nanostructures Enols Precursor Silica Lactones Template Carbonization Pore size Silica gel pK Phosphoric acid Scanning electron microscopy Binary compounds Nitrogen Carbon Dissolution Mesoporosity Impregnation Phenol Adsorption Pore Preparation Distribution Phenols Acid base titration Smooth surface
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Summary:	Mesoporous nanostructured carbons with surface acidic functional groups were prepared in one step by a combination of template technique and phosphoric acid activation using silica template and sucrose. Surface groups of carbons consist of phosphate groups (46%) and oxygen-containing groups while porous structure preserves templated pores (5.1 nm). [Display omitted] ► One-pot nanocasting and H 3PO 4 activation gives functionalized mesoporous carbons. ► Surface groups consist of phosphate groups (46%) and oxygen-containing groups. ► Porous structure preserves templated pores (5.1 nm) up to impregnation ratio 0.5. 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 (p K = 2.3 ± 0.1). Another surface groups are weak carboxylic (p K = 5.9 ± 0.3), lactone and/or enol (p K = 7.2 ± 0.2, p K = 8.8 ± 0.3) and phenol groups (p K = 10.5 ± 0.3). SEM showed smooth carbon surface up to impregnation ratio 0.5 and increasing roughness at higher amount of phosphoric acid.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0008-6223 1873-3891
DOI:	10.1016/j.carbon.2010.10.002