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By S Ayoob; A K Gupta; Venugopal Bhat

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Post 47, 949. Hofmann, H. and Neubauer, M. (1948). Medicinal charcoal and the differences in adsorption capacity of various charcoal preparations, Pharmazie 3, 529. Holt, L. , Jr. and Holz, P. H. (1963). The black bottle - a consideration of the role of charcoal in the treatment of poisoning in children, J. Pediatrics 63, 306. Horst, F. (1921). The adsorption capacity of various charcoals, Biochem. Z. 113, 99. Irgang, I. (1927). Some comparative investigations of medicinal carbon preparations, Dansk.

III. THE NATURE OF THE ADSORPTION PROCESS The chemical nature of the internal surfaces created when charcoal is activated is such that the surface has an attraction for certain molecules if they are present in the liquid phase which fills the pores. The intermolecular forces are of a relatively weak type and, therefore, desorption of the adsorbed solute can occur. That is, if one has adsorbed a drug onto charcoal by exposing the charcoal to an aqueous solution having a significant concentration of the drug, one can desorb the drug to some extent by exposing the charcoal to pure water (a more substantive discussion of desorption is given in Chapter 9, Section III).

7, which shows the charge on the salicylate molecule as a function of pH. It is clear that the percent salicylate adsorbed essentially varies inversely with the charge on the sali­ cylate molecule. Cooney and Wijaya (1987) have presented similar information on the percent adsorption of various aromatic compounds to charcoal as a function of pH. Again, the amount of charcoal, the solution volume, and the initial concentration of the solute in solution were held constant in each test series. , one that has both basic and acidic characteris­ tics).

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A Conceptual Overview on Sustainable Technologies for the Defluoridation of Drinking Water by S Ayoob; A K Gupta; Venugopal Bhat


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