bounedjar, nourelhouda, ּRenewable ּEnergy ּּResearch Unite in Arid Zones, Eׄl-Oued ּUniversity, B.P789, 39000ְ, ִּAlgeria. Department of chemistryְ, ּFaculty of exact sciences, University of Eׄl ּOued, B.P789, 39000ׅ, ֵAlgeria., ALGÉRIE