An Insight into the Adsorption Mechanism of Hexavalent Chromium onto Magnetic Pine Cone Powder

Magnetite as an adsorbent is efficient since iron oxides have high affinities for heavy metal pollutants and are environmentally friendly. Manganese oxides provide catalytic properties which are desirable during the remediation of multi valent pollutants. Magnetite (Fe3O4) and manganese doped magnetite (MnxFe(3-x)O4) nanoparticles were synthesized and characterized to determine the manganese doping effects on magnetite’s crystal and surface properties. Fe3O4 and MnxFe(3-x)O4 showed similarities in crystal morphology indicating that manganese doping did not alter the nature of Fe3O4 nanoparticles. Manganese doping improved magnetite’s thermal properties as well as its surface area providing improved adsorption characteristics. The as-synthesized particles were applied in the optimization of hexavalent chromium adsorption. Adsorption proceeded under similar conditions for both adsorbents indicating their structural similarities. Higher efficiencies were observed on the doped adsorbent due to increased surface area and the presence of additional functional groups. Solution pH significantly affected the adsorption process aiding in the reduction of Cr(VI) ions to the less toxic Cr(III) species. The adsorption distribution coefficient KD indicated that manganese doping significantly improved magnetite’s affinity for hexavalent chromium. Adsorption and reduction were determined to responsible for pollutant reduction in solution at optimal conditions of pH 2, 5 g/L and 100 mg/L for adsorbent mass and solution concentration.

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Assessment of the Composition of Forest Waste in Terms of Its Further Use

Bożym

Gendek

Siemiątkowski

et al. 2021

Materials

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This paper presents the results of the analysis of the chemical composition and content of heavy metal contamination in forest logging residues, in order to assess the possibility for their further utilisation. The samples were divided into 9 groups, which included coniferous tree cones, wood, and other multi-species logging residues. The elementary composition, ash content, and calorific value were determined as energy use indicators for the samples. Additionally, the content of heavy and alkali metals, which may affect combustion processes and pollutant emissions, was tested. The high content of heavy metals may also disqualify these residues for other uses. The research shows that the test residues are suitable for energy use due to their high calorific value and low content of heavy metals. However, an increased ash content in some samples and the presence of alkali metals, causing high-temperature corrosion of boilers, may disqualify them as a potential fuel in the combustion process. The forest residues may be used in other thermal processes such as pyrolysis or gasification. A low content of heavy metals and a high content of organic matter permit the use of these residues for the production of adsorbents or composite materials.

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An Insight into the Adsorption Mechanism of Hexavalent Chromium onto Magnetic Pine Cone Powder

Cited by 3 publications

References 24 publications

Sequestration of Heavy Metal Pollutants by Fe3O4-based Composites

Sequestration of Heavy Metal Pollutants by Fe3O4-based Composites

Optimizing Cr(VI) adsorption parameters on magnetite (Fe₃O₄) and manganese doped magnetite (Mn_xFe_(3-x)O₄) nanoparticles

Assessment of the Composition of Forest Waste in Terms of Its Further Use

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An Insight into the Adsorption Mechanism of Hexavalent Chromium onto Magnetic Pine Cone Powder

Cited by 3 publications

References 24 publications

Sequestration of Heavy Metal Pollutants by Fe3O4-based Composites

Sequestration of Heavy Metal Pollutants by Fe3O4-based Composites

Optimizing Cr(VI) adsorption parameters on magnetite (Fe3O4) and manganese doped magnetite (MnxFe(3-x)O4) nanoparticles

Assessment of the Composition of Forest Waste in Terms of Its Further Use

Contact Info

Product

Resources

About

Optimizing Cr(VI) adsorption parameters on magnetite (Fe₃O₄) and manganese doped magnetite (Mn_xFe_(3-x)O₄) nanoparticles