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Chapter 9 Adsorption

1 Chapter 9 Adsorption Introduction Adsorption : (i) the principle ways in which high-energy interfaces lower the overall energy of a system. (ii) A complex process which is different to be described precisely by theoretical model. Definition of Adsorption : Preferential concentration of one component of a system at an interface, where the local concentration is different from those in the bulk phase. (i) positive Adsorption : interfacial concentration of the adsorbed species is greater than that in the bulk phase. - decrease the interfacial energy. (ii) negative Adsorption : increase the interfacial energy of a system.

Vapor adsorbs on a solid surface is a spontaneous process - overall free energy change( G) : negative degree of freedom ( S) : decrease, negative ΔGS For G to be negative, H should be negative, that is, adsorption must be an exothermic process. z The situation may be different in the solid/liquid system.

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