1. Holding Company for Water and Wastewater (HCWW), Cairo, Egypt
2. Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt
3. Department of Basic Science, El Gazeera High Institute for Engineering and Technology, Cairo, Egypt
4. Materials Science and Nanotechnology Department, Faculty of Postgraduate Studies for Advanced Science, Beni-Suef University, Beni-Suef, Egypt