Modification and functionalization of mesoporous carbon
Abstract
The work presents the results of treating samples of single-walled meso-sized carbon tubes with a porous structure of 2÷50 nm with gaseous oxygen at a temperature of 800°C for different times (from 1 to 5 minutes). The degree of purification of meso-sized carbon tubes with a porous structure of 2÷50 nm was evaluated using the scanning electron microscopy method and showed a significant reduction in the content of amorphous meso-sized carbon particles in the sample. Meso-sized carbon tubes with a porous structure 2÷50 nm in size, like crystalline graphite, show the presence of a characteristic G-peak in the region of 1550-1600 cm-1 due to tangential (along the tube axis) C-C vibrations. They also have a broadened D-peak in the region of 1250-1350 cm-1, which is caused by asymmetric vibrations of meso-sized carbon bonds at defect sites in meso-sized carbon tubes and amorphous meso-sized carbon mixtures, which are observed in coal and have a porous structure with a size of 2÷50 nm characterized by Catalyst-contaminated meso-sized carbon tubes with a cylindrical multi-walled mesoporous structure were purified by heating in 5M HNO3 in a closed vessel in a microwave oven at 210°C (above the acid vaporization temperature). According to thermogravimetric analysis, the content of the metal catalyst in meso-sized carbon tubes with a multi-walled mesoporous structure decreased from 10.3% to 1.75% in just 10 minutes of such treatment.