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Adsorption Mechanism of Bentonite with Dispersed Chitosan for Cadmium Ions
Author(s) -
Huang Chengdu,
Huang Yongchun,
Xie Tenghui,
Yu Wanguo,
Ai Shuo
Publication year - 2021
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.202000505
Subject(s) - adsorption , bentonite , zeta potential , chitosan , freundlich equation , fourier transform infrared spectroscopy , chemistry , chemical engineering , x ray photoelectron spectroscopy , cadmium , organic chemistry , nanoparticle , engineering
Chitosan was dispersed on bentonite for the preparation of a Cd 2+ adsorbent. The adsorption process followed a Freundlich isotherm, and the experimental adsorption capacity was determined. For understanding the adsorption mechanism, the pristine and Cd‐doped adsorbents were analyzed by Fourier transform infrared and X‐ray photoelectron spectroscopy. A red shift of the band corresponding to amino groups was observed, while the Cd 3d binding energy declined. Furthermore, density functional theory calculation results indicated that Cd 2+ bonded with amino and hydroxyl groups in chitosan. The zeta potential of the adsorbent was lower than that of the support bentonite, improving the electrostatic affinity for Cd 2+ . The synergy between electrostatic and coordination interactions contributed to the adsorption capacity.