Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 108, Issue -, Pages 149-157Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2017.11.171
Keywords
Carboxylated cellulose nanocrystals; Alginate; Bead adsorbents; Pb(II); Adsorption
Funding
- National Natural Science Foundation of China [21476212]
- foundation of Science and Technology Department of Zhejiang Province [2017C33126]
- funds of Zhoushan Municipal Bureau of China [2017C41005]
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Carboxylated cellulose nanocrystal-sodium alginate (CCN-Alg) hydrogel beads were easily prepared through a cross-linking method. The structure and properties of the composite beads were characterized by TEM, FTIR, SEM, XPS, thermogravimetric analysis (TGA), and zeta potential measurement. A high ratio of 76% of the Pb(II) ion was adsorbed within the first 2 h, and the adsorption equilibrium was nearly reached after 3 h. The experimental isotherm could be fitted by the Langmuir model, yielding an extreme adsorption capacity of 338.98 mg g(-1). The adsorption process followed a pseudo-second-order kinetic model, and thermodynamic analyses confirmed that the adsorption is a spontaneous and endothermic process. Regeneration tests with acid treatment indicated that the CCN-Alg beads performed well in repeated Pb(II) adsorptions, as they could maintain an adsorption capacity of 223.2 mg g(-1) after five repeated cycles. These results indicate that these CCN-Alg beads are a potentially effective and sustainable adsorbent for application in wastewater treatment. (C) 2017 Elsevier B.V. All rights reserved.
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