Lead Adsorption in Manganese Oxides as Powders and Coatings Supported on Silica Gel Beads and Tin Inverse Opal-Like Structures

Author(s): Maria Guadalupe Almanza Martínez, José de Jesús Pérez Bueno*, Elizabeth Manríquez Reza, Maria Luisa Mendoza López

Journal Name: Current Analytical Chemistry

Volume 17 , Issue 6 , 2021


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Abstract:

Background: Pollution in water is of concern because of its negative influence on human health and impact on ecosystems. Three-dimensional (3D) structures in the form of inverse opals and opals-like structures were constructed on a scale of millimeters for their use in the adsorption of heavy metals adsorption on manganese oxide-covered surfaces.

Objective: Manganese oxides both, as commercial powders and as synthesized coatings by the chemical bath method, have a high capacity of lead ions adsorption. The inverse opals and opals-like structures increase the contact area and regulate the flux.

Methods: The chemical bath method was used to coating surfaces of inverse opals and opals-like structures. The size of structures was proposed in millimeters to guarantee an easier flow of water.

Results: The manganese oxide deposits were predominantly constituted by an amorphous phase. The present crystalline forms were identified as γ − MnO2, ε − MnO2, Birnessite, and pyrolusite. The best adsorption was obtained with Mn(II, III) and Mn(II), with 91.4% and 80.6%, respectively.

Conclusion: Mn(II, III) and Mn(II) had approximately three times better performance than oxides of Mn(III), Mn(IV), and chemical bath deposited MnO2 in powder form in the lead adsorption.

Keywords: Inverse opals, lead adsorption, manganese oxide, opals, MnO2, ecosystems.

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Article Details

VOLUME: 17
ISSUE: 6
Year: 2021
Published on: 08 June, 2021
Page: [831 - 838]
Pages: 8
DOI: 10.2174/1573411016666200116095505
Price: $65

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