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

[ Vol. 17 , Issue. 6 ]

Author(s):

Maria Guadalupe Almanza Martínez, José de Jesús Pérez Bueno*, Elizabeth Manríquez Reza and Maria Luisa Mendoza López   Pages 831 - 838 ( 8 )

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.

Affiliation:

Centro de Investigacion y Desarrollo Tecnologico en Electroquimica, S.C. Parque Tecnologico Queretaro-Sanfandila, Pedro Escobedo, Qro., Centro de Investigacion y Desarrollo Tecnologico en Electroquimica, S.C. Parque Tecnologico Queretaro-Sanfandila, Pedro Escobedo, Qro., Universidad Politecnica de Queretaro, Carretera Estatal 420 s/n, El Rosario, 76240 Queretaro, Qro., Tecnologico Nacional de Mexico, Instituto Tecnologico de Queretaro, Av. Tecnologico s/n Esq. M. Escobedo Col. Centro C.P.76000 Queretaro, Qro.

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