Jump to main content
Jump to site search

Issue 41, 2018
Previous Article Next Article

Pb(II), Cu(II) and Cd(II) removal using a humic substance-based double network hydrogel in individual and multicomponent systems

Author affiliations

Abstract

A systematic study of the interaction between adsorbents and potentially toxic metal ions in multicomponent systems is of great significance due to the coexistence of multiple potentially toxic metal ions in the real water environment. In this study, a new humic substance-based double network hydrogel (PAA/HS gel) was produced by a radical polymerization method and applied to Pb(II), Cu(II) and Cd(II) removal in both individual and multicomponent systems under various conditions. The macroporous network structure (aperture ≈ 10 μm) and high water permeability of the PAA/HS gel could fully facilitate the active site exposure and increase the potentially toxic metal ion diffusion rate. The PAA/HS gel exhibited high theoretical adsorption capacities of 360.50, 151.00 and 412.76 mg g−1 for Pb(II), Cu(II) and Cd(II) in individual systems. Noticeably, both interference and promotion of adsorption behaviors were identified in multicomponent systems. In binary systems, the adsorption capacity and rate were decreased for Pb(II) and Cu(II), while increased for Cd(II). In ternary systems, the adsorption capacity and rate for Pb(II), Cu(II) and Cd(II) were decreased. The adsorption isotherms and kinetics were well fitted by Langmuir–Freundlich and Elovich models, respectively, indicating that the PAA/HS gel possessed a heterogeneous surface and various types of binding sites. The FTIR and XPS studies confirmed that both nitrogen- and oxygen-containing functional groups (i.e., amino, phenolic hydroxyl and carboxyl groups) were involved in the adsorption process, while the interactions between functional groups and Pb(II), Cu(II) and Cd(II) were different.

Graphical abstract: Pb(ii), Cu(ii) and Cd(ii) removal using a humic substance-based double network hydrogel in individual and multicomponent systems

Back to tab navigation

Supplementary files

Publication details

The article was received on 27 Jul 2018, accepted on 14 Sep 2018 and first published on 18 Sep 2018


Article type: Paper
DOI: 10.1039/C8TA07250G
Citation: J. Mater. Chem. A, 2018,6, 20110-20120
  •   Request permissions

    Pb(II), Cu(II) and Cd(II) removal using a humic substance-based double network hydrogel in individual and multicomponent systems

    J. Ma, J. Luo, Y. Liu, Y. Wei, T. Cai, X. Yu, H. Liu, C. Liu and J. C. Crittenden, J. Mater. Chem. A, 2018, 6, 20110
    DOI: 10.1039/C8TA07250G

Search articles by author

Spotlight

Advertisements