Abstract
Ordered mesoporous carbon obtained by the soft template method was subjected to oxidation with the use of ammonium persulfate or nitric acid. The material was modified in different conditions in order to generate on its surface oxygen functional groups. Functionalization of carbon with nitric acid or ammonium persulfate at low temperatures caused a reduction in its surface area and pore volume. At elevated temperatures, the oxidation with (NH4)2S2O8 solution brought about an increase in these parameters, which is related, among others, with increased area of micropores. Transmission electron microscopy images confirm that the application of ammonium persulfate as an oxidizer does not lead to structural changes in carbon. FT-IR spectra and Boehm titration results proved that irrespective of the oxidation conditions, the process leads to generation of oxygen functional groups. Their highest content was observed for the carbon sample oxidized by a 5 M solution of HNO3 at 100 °C.
Highlights
Porous materials for a long time have enjoyed much interest because of their unique physicochemical, electric, mechanical and chemical properties following from well-developed surface area and large total pore volume
The aim of our study was to check the effect of the type of oxidizing agent on the physicochemical properties of ordered mesoporous carbon obtained by the soft template method
The isotherms of nitrogen adsorption on mesoporous carbons oxidized with ammonium persulfate or nitric(V) acid solution are present in Figs. 1 and 2
Summary
Porous materials for a long time have enjoyed much interest because of their unique physicochemical, electric, mechanical and chemical properties following from well-developed surface area and large total pore volume This group of materials includes activated carbons, activated carbon fibres, carbon molecular sieves, fullerenes, carbon nanotubes, mesoporous silica, metal oxides, zeolites and ordered mesoporous carbon materials [1,2,3,4,5]. The materials obtained in this way can successfully replace activated carbons and zeolites (a numerous group of aluminosilicates) in many branches of industry [2, 13, 14] Their very important property determining the widespread use of these materials is the possibility of controlling their structure and physicochemical properties through the choice of parameters of synthesis and the possibility of their chemical modification
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