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Non-linear theoretical model fitting for copper adsorption on (a) CS; (b) CS-g-TA; and theoretical model fitting for lead adsorption on (c) CS and (d) CS-g-TA. (pH: 4.0; adsorption time: 24 h; initial adsorbent quantity: 25 mg; initial volume: 50 mL; temperature: 25 °C).
