Fig. 4From: Adsorptive Removal of Copper (II) Ions from Aqueous Solution Using a Magnetite Nano-Adsorbent from Mill Scale Waste: Synthesis, Characterization, Adsorption and Kinetic Modelling StudiesM-H hysteresis graph of samples at different milling times a 3 h, b 5 h and c 7 hBack to article page