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Equilibrium isotherm models for the copper sorption process at different solution temperatures (amount of MANSG = 0.25 g; agitation speed = 200 rpm; solution volume = 25 mL; pH = 7): (a) Langmuir isotherm model; (b) Freundlich isotherm model; (c) Temkin isotherm model; (d) Elovich isotherm model.
