Fabrication of Polyethyleneimine-Modified Nanocellulose/Magnetic Bentonite Composite as a Functional Biosorbent for Efficient Removal of Cu(Ⅱ)

A novel inorganic–organic biosorbent, polyethyleneimine (PEI)-modified nanocellulose cross-linked with magnetic bentonite, was prepared for the removal of Cu(Ⅱ) from water. Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) showed that the amino and carboxyl groups were succ...

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Bibliographic Details
Published in:Water (Basel) 2022-09, Vol.14 (17), p.2656
Main Authors: Sun, Xiaoyin, Lv, Xintian, Han, Caohui, Bai, Lu, Wang, Tingting, Sun, Yongchang
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Aqueous solutions
Bentonite
Biopolymers
Cellulose fibers
Chelation
Chemisorption
Electrostatic properties
Fabrication
Fourier transforms
Functional groups
Heavy metals
Infrared spectroscopy
Isotherms
Metals
Nanoparticles
Oxidation
Polyethyleneimine
Reagents
Spectrum analysis
X-ray diffraction
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Summary:A novel inorganic–organic biosorbent, polyethyleneimine (PEI)-modified nanocellulose cross-linked with magnetic bentonite, was prepared for the removal of Cu(Ⅱ) from water. Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) showed that the amino and carboxyl groups were successfully grafted onto the nanocellulose structure. The adsorption performance of Cu(Ⅱ) with various factors, using the biosorbent, was investigated. The results show that the adsorption equilibrium could be reached within a short time (10 min), and the adsorption capacity of Cu(Ⅱ) reached up to 757.45 mg/g. The adsorption kinetics and adsorption isotherms were well-fitted with the pseudo-second-order and the Freundlich isotherm models, respectively. The adsorption process of the composite is mainly controlled by chemisorption, and functional group chelation and electrostatic force were the adsorption mechanisms; pore filling also has a great influence on the adsorption of Cu(Ⅱ). It was found that the prepared modified nanocellulose composite has great potential for the removal of heavy metals from water.
ISSN:2073-4441
2073-4441
DOI:10.3390/w14172656