Green synthesis of templated porous carbons

Abstract

Porous carbon materials such as activated carbons are widely used industrially for the purposes of purification, decolourization, deodorization, and gas storage, among others. Routes for the synthesis of these materials employing templates have increasingly attracted attention due to the ease of manipulating the characteristics of the final product. In the present work, a simple synthesis method was applied for the production of highly porous carbon materials using commercial sugar as the carbon source, Aerosil silica as a template, and deionized water. The synthesis procedure was as follows: (I) Gel formation; (II) carbonization of the gels; (III) removal of the silica template; (IV) activation. The materials were characterized by N2 and CO2 physisorption, Raman spectroscopy, X‐ray diffraction, Fourier‐transform infrared spectroscopy (FTIR), scanning electron microscopy, and thermogravimetric analysis. The aging time had an important influence on the specific area and porosity of the material, with physisorption analysis revealing a high specific area and pore volume. The activation procedures further contributed to significantly increasing the specific area (up to 1158 m2 g−1) and pore volume (up to 1.65 cm3 g−1). The X‐ray diffractograms and Raman spectra identified the formation of semi‐crystalline structures in the material, with the presence of a random distribution of graphite and graphene oxide, in addition to amorphous carbon. FTIR analysis showed the presence of bands corresponding to aromatic groups. The results demonstrated that it was possible to obtain materials with excellent potential for use in different industrial sectors using simple raw materials and a technique that is easy to reproduce.

Issue Highlights

“…The material synthesis can be easily modified and directed to obtain materials with specific characteristics. [ 2 ]…”

“…The material synthesis can be easily modified and directed to obtain materials with specific characteristics. [2] Effect of the fibre diameter polydispersity on the permeability of nonwoven filter media Dominique Thomas, Nathalie Bardin-Monnier, Augustin Charvet Based on numerical simulations on three-dimensional fibrous structures, a correlation allowing the prediction of dimensionless permeability for filters with various characteristics (polydisperse fibre size distributions, solid volume fraction) was developed. The expression, in which the fibre diameter is replaced by an equivalent fibre diameter depending on the parameters of the lognormal or normal fibre distribution, seems best suited for the prediction of the fibrous filter permeability than equivalent diameter correlations developed for bimodal distributions and extrapolated to polydisperse distributions (cube root diameter, area-weighted average diameter, volume-weighted average diameter, …).…”