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Mechanism of the Adsorption Process: Cu 2+ Adsorpted by Ramie Stalk
Author(s) -
Xu Sheng,
Gong Xiaofeng,
Zou Huiling,
Liu Chunying,
Chen Chunli,
Zeng Xiaoxing
Publication year - 2015
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201500298
Subject(s) - ramie , stalk , adsorption , chemistry , aqueous solution , dissociation (chemistry) , langmuir adsorption model , inorganic chemistry , chemical engineering , organic chemistry , horticulture , engineering , biology , fiber
Agriculture wastes, ramie stalk, was used to adsorb Cu 2+ ion from the aqueous solutions. Adsorption behaviors and mechanism involved in were systematically explored and discussed. A better fitting result of adsorption isotherms of Cu 2+ 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 Cu 2+ 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 Cu 2+ uptake at acidic environment.