1. Chemistry DepartmentFaculty of ScienceCairo University Gamaa Street Giza 12613 Egypt.
2. Institut Européen des Membranes, IEM – UMR 5635, ENSCM, CNRS, Univ Montpellier Montpellier France.
3. Chemistry Department, Faculty of ScienceHelwan University Helwan 11795 Helwan Egypt.