Analysis of adsorption data of nitrogen and carbon dioxide on chemically-activated carbons from cherry and wild cherry stones by considering different approaches based on different models

Activated carbons were prepared by activation of cherry and wild cherry sto nes with phosphoric acid and zinc chloride. The adsorption of nitrogen at - 196 degreesC and of carbon dioxide at 0 degreesC was followed and the data obtained analyzed through the use of models based on theories of surface co verage and micropore filling. Chemically- activated carbons obtained from cherry and wild cherry stones e xhibited high surface areas and large total pore volumes, Most of the pores lay in the micropore region while a small fraction of the total surface ar ea was located in non-micropores. Fair agreement was established on comparing the textural parameters derived from models based on the theory of surface coverage with those derived fro m the micropore filling theory. Micropores should be classified into ultraf ine pores, micropores and super-micropores, such sub-division helping in th e prediction of the adsorption behaviour and in the interpretation of the d ata derived therefrom.