Czech

Not applicable.

Students work up (at least) three elaborates with the evaluation of adsorption measurements according to Langmuir, BET and Dubinin-Raduškevičovič method.

Physical chemistry - thermodynamics

Not applicable.

Teaching methods depend on the type of course unit as specified in the article 7 of BUT Rules for Studies and Examinations.

Oral examen

1. Texture properties of solid substances - importance for industry applications as well as for substance behaviour in nature. Basic parameters (outer and inner surface, apparent (mercury) and real (helium) density of solid substances, total pore volume, pore distribution), characterisation and pore size distribution.
2. Theory of adsorption on solid substances - basic notions (adsorbent - adsorbate - adsorptive), characterisation of adsorption spots - homogenous and heterogeneous surfaces, interaction adsorbate-adsorbent, quantification of adsorption forces (Lennards-Jones potential), adsorption isotherms, Brunnauer classification of adsorption isotherms.
3.+4. Experimental procedures of texture parameter determination: adsorption methods - dynamic, static (gravity surveying, volumetric), method of inverse gas and liquid chromatography, adsorption from liquid environment, calorimetric methods, pyknometric methods, method of high pressure mercury porosimetry (Washburn equation, derivation), dispersion of RTG radiation under small angles.
5. Types of adsorption isotherms, monomolecular adsorption theory, Langmuir isotherm - description, derivation, linearization, determination of inner surface, practical examples.
6. Theory of multilayer adsorption (BET), derivation, linearization, calculation of inner surface, B-point.
7. Adsorption in micropores - theory of volume filling of micropores, Polányi potential, Dubinin-Polányi (Dubinin-Raduškevič) isotherm, Dubiniho postulates, translation of DP isotherm to other temperatures and adsorbates, calculation of micropore surface according to Medek.
8. Adsorption in interpores, capillary condensation, Kelvin equation, calculation of pore distribution according to their size.
9. Adsorption in flow regime, Glueckauf method of adsorption isotherm determination.
10. Adsorption from gas mixture - quantification procedures, sorption from liquid (water) environment, evaluation of experimental data, characterisation of adsorption spots for sorption of metal ions and organic pollutants.
11. Evaluation of substance texture from the viewpoint of fractal geometry, importance and possibility of fractal dimension D determination.
12. Gas and liquid flow through porous environment (viscous flow, Knudsen diffusion), specific permeability, relation between permeabile characteristics and texture parameters of solid substances, experimental procedures.

Not applicable.

Students will be introduced to texture properties of solid substances (morphology, outer and inner surface, volume and pore distribution) and to ways of their evaluation and quantification. Relation between texture parameters and utility properties of solid substances will be shown.

none

Not applicable.

Not applicable.

Gregg,S.J., Sing,K.S.W.: Adsorption, Surface Area and Porosity (2nd edition), Academic Press, London, 1982. (CS)
Ponec,V., Knor,Z., Černý,S.: Adsorpce na tuhých látkách, Praha SNTL, 1968. (CS)

Not applicable.