Active adsorption performance of planetary ball milled Saudi Arabian bentonite clay for the removal of copper ions from aqueous solutionAhmed Abutaleb, Mubarak A. Eldoma, Mohd Imran, Kamal K. Taha, Omer Y. Bakather, Nasser Zouli, Salah Eldeen F. Hegazi and Mohamed HassanEPL, 135 3 (2021) 30005DOI: https://doi.org/10.1209/0295-5075/ac1960