Ikuo Abe

Adsorption of saccharides from aqueous solution onto activated carbon

Abstract The Freundlichs adsorption constants of 13 saccharides and 4 polyhydric alcohols from aqueous solutions onto an activated carbon have been determined and correlated with various physical constants. A good linear relationship is obtained between the adsorption constants and the physical constant such as molecular refraction or parachor. Further, the adsorption isotherms of saccharides can be predicted from the carbon atom number and the oxygen atom number in the molecular formula.

Relation of adsorptive property of hydrophobic porous adsorbents and their surface area and pore volume

Abstract The adsorbability of methylene blue on 12 hydrophobic porous adsorbents with a wide variety of porosity has been measured. The adsorbability is quantitatively related with the surface area and the pore volume by means of multiple regression analysis.

Relationship between the Freundlich adsorption constants k and 1/N for activated carbon adsorption

Obtention dune relation lineaire entre le logarithme de K et 1/N des constantes dadsorption de Freundlich, lors de ladsorption de divers composes organiques sur des charbons actifs

Prediction of adsorption isotherms of organic compounds from water on activated carbons: IV. Adsorbability of structural isomers of alcohols

Abstract In order to clarify the adsorbability of structural isomers, the Freundlichs adsorption constants of the isomers of butanol and pentanol were determined and correlated with various physical constants such as solubility in water, boiling point, and some topological indexes characterizing the molecular connectivity or branching. A good linear relationship is obtained between the adsorption constant and the connectivity index. If the adsorption data of several normal compounds for a given activated carbon are obtained, the adsorption isotherms of the isomers can be predicted from the molecular connectivity alone.

The relation between activated carbon adsorption and water quality indexes

Abstract In order to estimate the adsorbability by activated carbon of organic compounds dissolved in aqueous solutions, the contribution of individual atoms to the adsorption process is calculated. The contribution of carbon, bromine and chlorine atoms is positive, that of oxygen atoms is negative, that of hydrogen atoms is very small and that of nitrogen atoms is influenced by the kind of functional group in which they are contained. The dominant factors governing adsorption are the numbers of carbon and oxygen atoms in a molecule. The activated carbons effectiveness for adsorption of organic compounds dissolved in solutions can be predicted from such water quality indexes as total organic carbon, total organic nitrogen, total organic halogen an total oxygen demand.

Adsorption of organic compounds from aqueous solution onto hydrophobic high-surface-area copolymer

Abstract The Freundlichs adsorption constants of 14 aliphatic monofunctional compounds from aqueous solution onto an hydrophobic high-surface-area copolymer have been measured. A good linear relationship is obtained between the adsorption constants and the physical constant such as molecular refraction or parachor. Further, the adsorption isotherms of many other monofunctional compounds can be predicted from the molecular refraction alone.

Prediction of adsorption isotherms of organic compounds from water on activated carbons: V. Multiple linear regression analysis method

Abstract An empirical adsorption equation is presented for predicting the adsorption isotherms from aqueous solution for a wide variety of hydrophobic porous adsorbent—adsorbate systems. The equation, which is based on the multiple linear regression analysis, comprises four parameters: surface area (S), mean pore diameter (D), molecular refraction (Mr), and number of hydrophilic functional group (Nf). Mr of adsorbate offers a basis for expressing quantitatively the adsorbent—adsorbate interactions associated with the dispersion forces. Nf in an adsorbate molecule represents the strength of the adsorbate—water interactions. S and D of adsorbent represent the adsorptive capacity and the adsorptive strength, respectively.

Evaluation of Adsorption Property of Porous Carbon Materials (I) Evaluation by Benzene Adsorption in Vapor Phase

A method is presented for evaluating the adsorption property of porous carbon materials in gas and liquid phases.Adsorption isotherms of benzene are determined on 19 kinds of activated carbons and the adsorption constants, W°and B, in Dubinin-Radushkevich equation are calculated.An adsorption equation is presented for predicting the adsorption isotherms of various organic compounds from aqueous solution.The equation, which is based on the multiple linear regression analysis, comprises four parameters: molecular refraction (Mr), number of hydrophilic group (Nf), micropore volume (W°), and function of pore volume distribution (B).Mr of adsorbate offers a basis for expressing quantitatively the adsorbentadsorbate interactions associated.with the dispersion forces.Nf in an adsorbate molecule is assumed to represent the strength of the adsorbate-water interactions.W°and B represent the adsorption capacity and the strength of adsorbent-adsorbate interaction, respectively. Another equation, in which the amounts of benzene adsorbed at P/P0= 0.01 and 0.1 are used instead of W° and B, is presented and the method using the equation is very simple and useful for evaluating the adsorption property in gas and liquid phases.