The difference between activated carbon and graphiteized carbon black.

Activated carbon belongs to the non-stereotyped carbon, in the structure of microcrystalline carbon is irregular arrangement,there are fine holes between the cross-connection, in activation will produce carbontissuedefects, is a porous carbon, low accumulation density,larger than the surface area.

graphiteized carbon black (GCB) is a carbon material produced by carbon black under the protection of an inert gas ( >usually argon< Carbon graphite (Carb) is composed of a splatical dot-collage unit composed of a weak Van der Waal force combined with a loose mesh layer, which belongs to a lower degree of graphiteization of carbon matter at high temperatures, the carbon black interior and surface of the large gap structure is destroyed, the surface produces a smooth, holeless graphite crystal structure. Therefore, the carbon atoms on the GCB surface are SP2 hybridization, with single electron pairs and lively ions, and a hexagon microstructure. Unlike materials such as carbon black and activated carbon, the GCB surface is generally water-repulsive and can absorb non-polarity and weak polarity compound;

, it can absorb both non-polar and weak polar compounds and polar compounds, showing a wide range of adsorption spectrum to compounds. This special hexal structure on the GCB surface makes its adsorption and deconsorption of the compound closely related to the geometry of the compound. For example, GCB was originally used as a fixed phase separation isomer or a stereosomy of a isoenphonomy of a GC. In the 1980s, GCB was developed intoef<column fillers to separate compounds and remove pigments.

activated carbon and graphite carbon black different points:1, structural comparison, activated carbon contains a large number of micro-holes, with a large than the surface area,500m2/g or higher, adsorption of compounds of many types, adsorption capacity.Graphiteized carbon black through high temperature and high pressure calcination, removing the activated carbon surface of the hybrid atoms,the surface formed the densest arrangement and rigid structure, no holes, than the surface area of about 100m2/g.2, adsorption mode, the porous structure of activated carbon determines that it is multi-molecular layer absorption,and graphiteized carbon black is a single molecular layer absorption mode, ratic temperaturewhen the pressure increases to a certain value,the single molecular layer adsorption saturation saturation after the beginning of multi-molecular layer absorption.Differences in absorption patterns result in graphiteized carbon black adsorption capacity (sample capacity) is much smaller than activated carbon. 3, the force, activated carbon contains hybrid atoms, porous structure, large surface activity, uneven distribution, the type of force produced on the compound is much more than graphite carbon black, hair bio-chemical academic adsorption and reaction is more likely. The hexar structure of the black surface of graphiteized carbon makes it highly adsorbed for flat molecules or molecules containing flat aromatic rings. 4, activated carbon is porous, graphiteized carbon is non-porous, in the pre-analysis of pesticide residues, with activated carbon adsorption, a lot of pesticides are non-expurified, applications, activated carbon industrial use is quite Widely available, but in the chromatography field (including SPEs), graphiteized carbon black has a more obvious advantage, because the compound on the graphite carbon black adsorption and excerption of the law is easy to grasp. Graphite carbon black has a strong adsorption ability to pigment, as long as the sample after GCB treatment can also be identified by the naked eye pigment, it can be judged that the recovery rate of agricultural residues in the sample will not be significantly affected, which is why GCB is widely used in agricultural residues testing. Compared with activated carbon, because of the number of active bits, the force is complex, want to get a good recovery rate will be much more difficult.