Heavy metal ion is a kind of pollutant with great harm. In order to improve the adsorption performance of heavy metal ion on activated carbon, modified activated carbon was used to improve its adsorption effect on heavy metal ion.
In this study, the activated carbon was modified by nitric acid oxidation, sodium hydroxide impregnation, nitrogen protected high temperature reduction and other methods.
Activated carbon before and after modification was characterized by specific surface area measurement, scanning electron microscope observation, Fourier transform infrared spectroscopy measurement and Boehm functional group titration.
The results show that there are -OH, -C=O, -C-OH and other functional groups on the surface of activated carbon.
The surface functional group structure and specific surface area of the modified GAC were changed, and the changes of the surface functional group structure and specific surface area of the activated carbon prepared by different modification methods were different.
The specific surface area of activated carbon modified by niactivated carbon gold miningtric acid increased from 925.45m'lg to 960.52m2/g, and the number of acid functional groups (carboxyl group, phenolic hydroxyl group) increased from 0.23 mmol/g to 0.36 mmol/g, while the number of acid functional groups and specific surface area of activated carbon modified by reduction decreased.activated carbon company