Abstract
Accuracy of Dubinin-Astakhov (DA) and Dubinin-Radushkevich (DR) isotherm models were examined for evaluating micropore volume of several natural and pillared bentonite samples with type I and II isotherms. Afterwards, the obtained results were compared with the micropore volume calculated by Horvath–Kawazoe (HK) model. The results showed that the accuracy of DA and DR models for this purpose depends on isotherm types and range of relative pressure (P/P0) in which the models are applied. It can be generally concluded that DA and DR can be used to calculate micropore volume of bentonite instead of HK which imposes more complicated calculations.
Highlights
Clay can be used in several applications due to its physical and chemical properties, such as large specific surface area, cation exchange capacity and adsorptive affinity for inorganic and organic ions from aqueous solution and water
Accuracy of Dubinin-Astakhov (DA) and Dubinin-Radushkevich (DR) isotherm models were examined for evaluating micropore volume of several natural and pillared bentonite samples with type I and II isotherms
The results showed that the accuracy of DA and DR models for this purpose depends on isotherm types and range of relative pressure (P/P0) in which the models are applied
Summary
Clay can be used in several applications due to its physical and chemical properties, such as large specific surface area, cation exchange capacity and adsorptive affinity for inorganic and organic ions from aqueous solution and water. Bentonite is considered as a main candidate in the removal of pollutants such as lead and other heavy metal ions. Since the existence of huge deposits of bentonite, there is a great potential for its utilization in removing various dilute pollutants and adsorption technology including the removal of heavy metal ions [5,6,7,8], phenols [9,10,11], organic molecules [12,13], polymers [14,15], pesticides [16], radio nuclides [17], dyes [18,19,20]. To apply bentonite in adsorption, the textural properties including surface area, pore size, micropore volume and mesopore volume must be determined. The textural properties of porous materils are very often determined by gas (N2) adsorption isotherm data [8,21,22]
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