期刊
CARBOHYDRATE POLYMERS
卷 230, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2019.115631
关键词
Periodate oxidation; 2,3-Dialdehyde nano-fibrillated celluloses; Adsorption; Cu (II)
资金
- National Natural Science Foundation of China [31971603]
- Fundamental Research Funds for the Central Universities [2019MS084]
- Foundation of State Key Laboratory of Bio-based Material and Green Papermaking [KF201802]
- Guangdong Province Science Foundation for Cultivating National Engineering Research Center for Efficient Utilization of Plant Fibers [2017B090903003]
Nano-fibrillated celluloses (NFCs) were separated from bleached softwood kraft pulp. Through the periodate oxidation method, 2,3-dialdehyde nano-fibrillated celluloses (DNFCs) with varied aldehyde content were prepared. The high aldehyde content, large specific surface area and high surface charge density of DNFCs benefited the adsorbing of Cu (II). The adsorption kinetics and isotherms presented good correlations with the Pseudosecond-order model and Freundlich model, respectively. Both physical and chemical adsorptions existed in the Cu (II) adsorption by DNFCs, while chemisorption was the rate-limiting step. The adsorption thermodynamic parameters Gibbs free energy change (Delta G), enthalpy change (Delta H) and entropy change (Delta S) were also investigated. This study provides theoretical support for applying DNFCs to remove metal ions from aqueous solutions.
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