The Effect of Heterogeneity on the Adsorption Isotherms in Activated Carbon
No. 31 (2010-01-01)Author(s)
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Jose Carlos Alexandre De Oliveiraa Ingeniero Químico. Becario Postgrado FONCYT, alumno de Doctorado, Universidad Nacional de San Luis. San Luis, Argentina. alex@unsl.edu.ar
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Deicy Barrerab Ingeniera Química. Becaria Postgrado FONCYT, alumna de Maestría. Universidad, Nacional de San Luis. San Luis, Argentina. deicybarrera@unsl.edu.ar
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Juan Pablo Tosoc Licenciado en Física. Tesista de Maestría, Instituto de Física Aplicada INFAP, Universidad Nacional de San Luis. San Luis, Argentina. jtoso@unsl.edu.ar
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Raúl H. Lópezd PhD. en Física. Investigador asistente, Instituto de Física Aplicada INFAP (CONICET), Universidad Nacional de San Luis. San Luis, Argentina. rlopez@unsl.edu.ar
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Karim Sapage PhD. en Física. Investigador adjunto, Instituto de Física Aplicada INFAP (CONICET), Profesor asociado, Universidad Nacional de San Luis. San Luis, Argentina. ksapag@gmail.com
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Giorgio Zgrablichf PhD. en Física. Director, Instituto de Física Aplicada INFAP, Universidad Nacional de San Luis. San Luis, Argentina. giorgio.unsl@.gmail.com
Abstract
Activated carbons (AC) are microporous materials that have high adsorptive capacity. The heterogeneity of any adsorbent, in particular of the AC, can be separated into two large families: energetic and structural. Structural heterogeneity is caused by the presence of pores of different sizes, shapes and how they are interconnected, while the energy heterogeneity is caused by surface irregularities, as well as by the presence of functional groups and / or impurities. In this paper we discuss different models of surface heterogeneity in materials with slit pores and its effect on adsorption isotherms and the pore size distributions (PSD).
Keywords:
Activated carbons, adsorption isotherms, heterogeneity, pore size distributions