Adsorption behavior and mechanism of Cd (II) by modified coal-based humin

Shanxi coal-based humin (SCH) was extracted using sequential alkali extraction from Shanxi Lingshi coal, and obtained the modified coal-based humin (Ca-SCH) by Ca(OH)2. On the basis of the problem of SCH’s high alkalinity and low adsorption amount to heavy metals, SCH was modified by using Ca(OH)2 a...

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Published inEnvironmental technology & innovation Vol. 23; p. 101699
Main Authors Wang, Ping, Ding, Fangjun, Huang, Zhanbin, Fu, Zhanyong, Zhao, Peng, Men, Shuhui
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.08.2021
Subjects
Adsorption kinetics
Adsorption thermodynamics
Calcified modification
Cd (II)
Coal-based humin
Adsorption kinetics
Calcified modification
Coal-based humin
Cd (II)
Adsorption thermodynamics
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Abstract Shanxi coal-based humin (SCH) was extracted using sequential alkali extraction from Shanxi Lingshi coal, and obtained the modified coal-based humin (Ca-SCH) by Ca(OH)2. On the basis of the problem of SCH’s high alkalinity and low adsorption amount to heavy metals, SCH was modified by using Ca(OH)2 and characterized by a series of representation analysis, and studied by static adsorption experiments for the adsorption kinetic and thermodynamic characteristics of SCH and Ca-SCH to Cd (II). Results showed that scanning electron microscope (SEM), BET method and X-ray photoelectron spectroscopy (XPS) certificated that the Ca (II) was loaded onto Ca-SCH successfully. In addition, the surface of Ca-SCH became coarse, the pore diameter of Ca-SCH increased, and content of oxygen functional groups also increased which was beneficial to the adsorption of Cd (II). The adsorption equilibriums of SCH and Ca-SCH were reached within 120 min, which accord with the pseudo-second-order kinetic equation, and the adsorption isotherms were well depicted by the Langmuir and Freundlich models. The maximum adsorption capacity (Qm) of Cd (II) on Ca-SCH was 89.29 mg⋅g−1, and increased 23.23% compared with SCH. By chemical modification, the Ca (II) can be boned to Ca-SCH, and Ca (II) and Cd (II) by ion exchange can be used to improve the adsorption performance of SCH, which is valuable for deactivating of Cd (II) in soil. [Display omitted] •Coal-based humin was extracted using sequential alkali extraction.•Modified coal-based humin was prepared through Ca(OH)2.•A significant improvement in activity and pore diameter of modified coal-based humin.•Modified coal-based humin showed more adsorption capacity for Cd(II) than coal-based humin.•Adsorption mechanisms were cation exchange, chemical adsorption, and physical adsorption.
AbstractList Shanxi coal-based humin (SCH) was extracted using sequential alkali extraction from Shanxi Lingshi coal, and obtained the modified coal-based humin (Ca-SCH) by Ca(OH)2. On the basis of the problem of SCH’s high alkalinity and low adsorption amount to heavy metals, SCH was modified by using Ca(OH)2 and characterized by a series of representation analysis, and studied by static adsorption experiments for the adsorption kinetic and thermodynamic characteristics of SCH and Ca-SCH to Cd (II). Results showed that scanning electron microscope (SEM), BET method and X-ray photoelectron spectroscopy (XPS) certificated that the Ca (II) was loaded onto Ca-SCH successfully. In addition, the surface of Ca-SCH became coarse, the pore diameter of Ca-SCH increased, and content of oxygen functional groups also increased which was beneficial to the adsorption of Cd (II). The adsorption equilibriums of SCH and Ca-SCH were reached within 120 min, which accord with the pseudo-second-order kinetic equation, and the adsorption isotherms were well depicted by the Langmuir and Freundlich models. The maximum adsorption capacity (Qm) of Cd (II) on Ca-SCH was 89.29 mg⋅g−1, and increased 23.23% compared with SCH. By chemical modification, the Ca (II) can be boned to Ca-SCH, and Ca (II) and Cd (II) by ion exchange can be used to improve the adsorption performance of SCH, which is valuable for deactivating of Cd (II) in soil. [Display omitted] •Coal-based humin was extracted using sequential alkali extraction.•Modified coal-based humin was prepared through Ca(OH)2.•A significant improvement in activity and pore diameter of modified coal-based humin.•Modified coal-based humin showed more adsorption capacity for Cd(II) than coal-based humin.•Adsorption mechanisms were cation exchange, chemical adsorption, and physical adsorption.
ArticleNumber 101699
Author Ding, Fangjun
Fu, Zhanyong
Huang, Zhanbin
Zhao, Peng
Wang, Ping
Men, Shuhui
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Keywords Adsorption kinetics
Calcified modification
Coal-based humin
Cd (II)
Adsorption thermodynamics
Language English
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SSID ssj0002315656
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Snippet Shanxi coal-based humin (SCH) was extracted using sequential alkali extraction from Shanxi Lingshi coal, and obtained the modified coal-based humin (Ca-SCH) by...
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SubjectTerms Adsorption kinetics
Adsorption thermodynamics
Calcified modification
Cd (II)
Coal-based humin
Title Adsorption behavior and mechanism of Cd (II) by modified coal-based humin
URI https://dx.doi.org/10.1016/j.eti.2021.101699
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