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Highly efficient removal of Mn(II) and organic pollutant by adipate functionalized Ca-Al layered double hydroxides: Capture behavior and mechanism.

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Title: Highly efficient removal of Mn(II) and organic pollutant by adipate functionalized Ca-Al layered double hydroxides: Capture behavior and mechanism.
Authors: Zhang, Yang1 (AUTHOR), Wu, Hanjun1,2 (AUTHOR) wuhj1204@wit.edu.cn, Zhang, Zhenyue1,2,3 (AUTHOR), Guo, Wenda2,3 (AUTHOR), Yu, Junxia1,2 (AUTHOR), Zeng, Rongying4 (AUTHOR), Chi, Ruan2,3 (AUTHOR), Pan, Zhiquan1,2 (AUTHOR)
Source: Colloids & Surfaces A: Physicochemical & Engineering Aspects. Jul2025, Vol. 717, pN.PAG-N.PAG. 1p.
Subjects: Layered double hydroxides, Exothermic reactions, Naphthol, Adipic acid, Hydrogen bonding interactions
Abstract: In this work, Ca-Al LDHs were modified via co-precipitation method utilizing two distinct chemical forms of adipic acid (adipate salt and adipic acid) as intercalation agents, with the resulting materials denoted as At-LDHs (adipate-intercalated LDHs) and Aa-LDHs (adipic acid-intercalated LDHs). The results indicated that At-LDHs and Aa-LDHs all exhibit a sheet-like porous structure stacked with each other. Due to the different synthesis conditions, the sheet structure of Aa-LDHs is smaller than that of At-LDHs. The kinetic and isotherm simulation results indicated that the capture capacity of At-LDHs for Mn2 + was up to 227.53 mg·g−1 when the pH value was 7, while that of Aa-LDHs for naphthol green B reached to 132.73 mg·g−1 at a pH value of 9. The kinetic and thermodynamic simulation results indicated that the capture of Mn2+ by At-LDHs conformed to the pseudo-first-order kinetic model and the Langmuir isotherm model, and the capture of naphthol green B by Aa-LDHs conformed to the Elovich kinetic model and the Temkin isotherm model. In addition, the capture process of both was a spontaneous exothermic reaction. Benefiting from the excellent adsorption properties of At-LDHs composites (Ion exchange, electrostatic attraction, adsorption precipitation, functional group chelation), the adsorption effect on Mn2+ was better. Aa-LDHs have good adsorption effect on naphthol green B in solution through electrostatic attraction, dipole-dipole hydrogen bond, Yoshida hydrogen bond and n-π interaction. At-LDHs and Aa-LDHs have great potential to be employed as the materials for the removal of organic and inorganic composite pollutants from wastewater. [Display omitted] • Adipate and adipic acid functionalized LDHs were synthesized. • The composites showed excellent uptake properties for Mn(II) and naphthol green B. • At-LDHs exhibit remarkable selectivity for Mn(II) in multi-ion coexisting systems. • The composites had good stability and recyclability on capture of Mn(II) and naphthol green B. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:In this work, Ca-Al LDHs were modified via co-precipitation method utilizing two distinct chemical forms of adipic acid (adipate salt and adipic acid) as intercalation agents, with the resulting materials denoted as At-LDHs (adipate-intercalated LDHs) and Aa-LDHs (adipic acid-intercalated LDHs). The results indicated that At-LDHs and Aa-LDHs all exhibit a sheet-like porous structure stacked with each other. Due to the different synthesis conditions, the sheet structure of Aa-LDHs is smaller than that of At-LDHs. The kinetic and isotherm simulation results indicated that the capture capacity of At-LDHs for Mn2 + was up to 227.53 mg·g−1 when the pH value was 7, while that of Aa-LDHs for naphthol green B reached to 132.73 mg·g−1 at a pH value of 9. The kinetic and thermodynamic simulation results indicated that the capture of Mn2+ by At-LDHs conformed to the pseudo-first-order kinetic model and the Langmuir isotherm model, and the capture of naphthol green B by Aa-LDHs conformed to the Elovich kinetic model and the Temkin isotherm model. In addition, the capture process of both was a spontaneous exothermic reaction. Benefiting from the excellent adsorption properties of At-LDHs composites (Ion exchange, electrostatic attraction, adsorption precipitation, functional group chelation), the adsorption effect on Mn2+ was better. Aa-LDHs have good adsorption effect on naphthol green B in solution through electrostatic attraction, dipole-dipole hydrogen bond, Yoshida hydrogen bond and n-π interaction. At-LDHs and Aa-LDHs have great potential to be employed as the materials for the removal of organic and inorganic composite pollutants from wastewater. [Display omitted] • Adipate and adipic acid functionalized LDHs were synthesized. • The composites showed excellent uptake properties for Mn(II) and naphthol green B. • At-LDHs exhibit remarkable selectivity for Mn(II) in multi-ion coexisting systems. • The composites had good stability and recyclability on capture of Mn(II) and naphthol green B. [ABSTRACT FROM AUTHOR]
ISSN:09277757
DOI:10.1016/j.colsurfa.2025.136774