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Table 3 Copper removal efficiency under different dosages (0.05–0.08 g) The letters difference a-g indicate the level of significant differences in copper removal efficiencies at varied dosage (p<0.0001).

From: Adsorptive Removal of Copper (II) Ions from Aqueous Solution Using a Magnetite Nano-Adsorbent from Mill Scale Waste: Synthesis, Characterization, Adsorption and Kinetic Modelling Studies

Time Dosage
0.05 g 0.2 g 0.5 g 0.8 g
0 0.00f 0.00f 0.00 g 0.00 g
5 17.67e 30.56d 7.15f 7.03f
15 43.18d 31.27c 11.34e 8.46e
30 49.30c 36.52b 14.31d 10.07d
60 55.10b 37.27a 21.82c 11.56c
120 62.58a 37.44a 38.73b 13.26b
180 62.61a 37.43a 40.43a 24.31a
240 62.62a 37.23a 40.29a 24.30a
p value  < .0001  < .0001  < .0001  < .0001
  1. The letters indicate the level of significant and differences in the removal efficiencies of Cu2+