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 nitric 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 charcoal suppliers & manufacturers
Activated carbon according to its source is usually divided into plant carbon, animal carbon and mineral carbon three kinds, respectively, the use of wood chips or plant fiber, animal bones, coal and so on by high temperature carbonization.
At present, the commonly used medical activated carbon and activated carbon chromatography with wood chips as raw materials, add zinc chloride in 700-800 by high temperature carbonization, activation, and by appropriate methods to remove impurities.
Due to the presence of various metal ions in plants and the addition of zinc chloride in the production process, although it has been properly treated before leaving the factory, it is inevitable to contain trace metal ions, which should be paid attention to when used.
Activated carbons used for chromatography generally fall into the following three categories.wholesale activated carbon pellet(a).
Powdered activated carbonThe general use of medicinal or chemical pure activated carbon.
This kind of activated carbon particles is very fine, in powder form, the total surface area is particularly large, the adsorption capacity is very strong, the adsorption capacity is also very large, is the strongest kind of activated carbon adsorption force.
