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

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Author(s): Maria Guadalupe Almanza Martínez, Jose de Jesus Pérez-Bueno*, Elizabeth Manríquez Reza, M. L. Mendoza López.

Journal Name: Current Analytical Chemistry

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Abstract:

Background: Pollution in water is of concern because of its negative influence on human health and impact in 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.

Hypothesis/Objective: Manganese oxides both, as commercial powders and as synthesized coatings by the chemical bath method, have high capacity of lead ions adsorption. The inverse opals and opals-like structures increases the contact area and regulates 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: Lead Adsorption, Opals, Inverse Opals, Manganese Oxide

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Article Details

(E-pub Ahead of Print)
DOI: 10.2174/1573411016666200116095505
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