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. 2020 Jun 25;7:100976. doi: 10.1016/j.mex.2020.100976

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© 2020 The Authors

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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Fig 6 — (A): Effect of initial Concentration on adsorption of ED-ions Cu(II) onto CS-nZVI. Experimental conditions:Vol of Cu²⁺solution = 50 mL; mg/LAdsorbent dose = 100 mg;pH = 6, contact time = 60 min and temperature = 25± 2 °C. (B): Effect of contact time on adsorption of ED-Cu(II) onto CS-nZVI. Experimental conditions:Cu²⁺Concentration=10 – 200 mg L^-1; vol of Cu²⁺solution = 50 mL;Adsorbent dose= 100 mg; pH = 6, and temperature = 25± 2 °C. (C): Effect of pH on adsorption of ED-Cu(II)ions onto ions CS-nZVI. Experimental conditions: Vol of Cu²⁺solution = 50 mL; Adsorbent dose = 100 mg;pH = 6, contact time = 60 min and temperature = 25± 2 °C, Stirring speed = 200 rpm. (D): Effect of ionic strength on adsorption of ED-Cu(II) ions onto CS-nZVI. Experimental conditions:Cu²⁺Concentration=10 – 200 mg/L; Vol of Cu²⁺solution = 50 mL;Adsorbent dose= 100 mg; pH = 6, and temperature = 25± 2 °C, Stirring speed =200 rpm. (E): Effect of adsorbent dose on adsorption of ED-Cu(II) ion on CS-nZVI. Experimental conditions: Cu²⁺ Concentration= 150 mg/L; Vol of Cu²⁺solution = 50 mL; pH = 6, Stirring speed = 200 rpm, Contact time = 60 min, and Temperature = 25± 2 °C.