J. Phys. IV France
Volume 123, March 2005
Page(s) 393 - 399

J. Phys. IV France 123 (2005) 393-399

DOI: 10.1051/jp4:2005123072

Isotherms and kinetic study of dihydrogen and hydrogen phosphate ions (H2PO4- and HPO42-) adsorption onto crushed plant matter of the semi-arid zones of Morocco: Asphodelus microcarpus, Asparagus albus and Senecio anthophorbium

M. Chiban1, H. Benhima1, B. Saadi2, A. Nounah1 and F. Sinan1

1  Labo. Chimie-Physique, Fac. des Sciences d'Agadir, BP. 8106, Cité Dakhla, Maroc
2  Labo. Biologie Végétale et de Symbiotes Racinaires, Fac. des Sciences d'Agadir, BP. 8106, Cité Dakhla, Maroc

In the present work H2PO4- and HPO42- ions adsorption onto organic matter (OM) obtained from ground dried three plants growing in arid zones of Morocco has been studied. The adsorption process is affected by various parameters such as contact time, particle size and initial concentration of phosphate solution (C$_{\rm i}$ $\le$ 30 mg/l). The uptake of both ions is increased by increasing the concentration of them selves. The retention of phosphate ions by Asphodelus microcarpus, Asparagus albus are well defined by several isotherms such as the Langmuir, Temkin and Freundlich.

© EDP Sciences 2005