Abstract
AbstractAgriculture wastes, ramie stalk, was used to adsorb Cu2+ ion from the aqueous solutions. Adsorption behaviors and mechanism involved in were systematically explored and discussed. A better fitting result of adsorption isotherms of Cu2+ to ramie stalk was obtained from the Langmuir model. This suggested the surface of ramie stalk is rather homogeneous, which is supported by a better fitting result of the adsorption kinetic by using a pseudo‐first‐order kinetic model. Following surface complexation modeling suggested Cu2+ uptake is driven by water‐associated adsorption along with the precipitated CuO species. This is attributed to the low dissociation constant of ramie stalk and thus there was only around one quarter of sur‐ face adsorption sites participating Cu2+ uptake at acidic environment.
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