Adsorption Kinetics and Thermodynamics of Expanded Graphite for Diphenylamine -4- sulfonate

doi:10.3969/j.issn.1000-1565.2010.01.009

Abstract

Abstract: With diphenylamine -4- sulfonic acid sodium (DPASA) as referenced compound, its adsorption kinetics and thermodynamics characteristics on expanded graphite (EG) were investigated. The influence of initial mass concentrations of DPASA, temperatures, pH, ionic strengths and adsorbent expanded volumes (EV) on the adsorption capacity was studied. Kinetic studies show that the kinetic data are well described by the pseudo second-order kinetic model. Under the tested condition, the activation energy of adsorption process is among 1-10 kJ/mol. The adsorption thermodynamics results indicate that the adsorption types of DPASA on EG is type II. Equilibrium adsorption amount was found to increase with the increase in initial mass concentrations of DPASA, ionic strengths and EV of the adsorbent, while temperature and solution acidity do not have an obvious effect. Physical adsorption is the major factor of the overall adsorption process.

Key words: expanded graphite, diphenylamine-4-sulfonate, adsorption kinetics, adsorption thermodynamics

CLC Number:

O647.31

PANG Xiu-yan,SU Ya-juan,L(U) Pu,REN Hai-li,GONG Fei. Adsorption Kinetics and Thermodynamics of Expanded Graphite for Diphenylamine -4- sulfonate[J]. Journal of Hebei University (Natural Science Edition), 2010, 30(1): 37-42,48.

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