Physics Department of Science-Suef University;
Geology and Geophysics Department of Science Saud University Riyadh Arabia;
Geology Department of Science-Suef University;
Department of Building Materials Construction Chemistry of Civil Engineering Universitat Berlin;
Structural Engineering Department of Engineering University;
Raw Building Materials and Processing Technology Research Institute and Building National Research Center(HBRC);
Faculty of Earth Science–Suef University;
COAL; Magnetic nanoparticles; Cr(Ⅵ)adsorption; Statistical models; Thermodynamic parameters;