activated carbon

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Related to Activated coal: activated charcoal, activated carbon

activated carbon

[′ak·tə‚vād·əd ′kär·bən]
(materials)
A powdered, granular, or pelleted form of amorphous carbon characterized by very large surface area per unit volume because of an enormous number of fine pores. Also known as activated charcoal.

activated charcoal, activated carbon

Charcoal obtained by carbonizing organic material, usually in the absence of air; usually in granular or powdered form; highly effective in adsorbing odors in air or in removing colors in solution.
References in periodicals archive ?
Figure 5 shows the equilibrium isotherms for the adsorption process of the metal ions [Cu.sup.2+] and [Zn.sup.2+] by the biosorbent acai endocarp and by activated coal.
Figure 5 shows that adsorption isotherms for the biosorbent (Figure 5a) and for activated coal (Figure 5b) have a convex behavior, typical of Class L (Langmuir), with an initial downward curve due to the decrease of the availability of active sites, with high removal capacity in the lowest concentrations, but with a trend towards equilibrium in the highest concentrations.
In the case of adsorption of the metal ions by activated coal, Langmuir's model has the best adjustment ([R.sup.2] = 0.999).
In the case of the mathematical parameters of Langmuir's model, maximum adsorption quantity ([Q.sub.m]) rates of the biosorbent (3.997 and 3.929) for the [Cu.sup.2+] and [Zn.sup.2+] ions were lower than [Q.sub.m] rates by activated coal (14.166 and 12.631).
Such behavior has been registered (Table 4) for the biosorbent and for activated coal in the case of the metal ions under analysis.
Activated coals are porous carbon adsorbent with developed internal surface, consisting of open pores and capillary channels with the volume of 0.23-0.26 ml/g [15].

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