A study of the removal of selenite and selenate from aqueous solutions using a magnetic iron/manganese oxide nanomaterial and ICP-MS

González, Christina M.; Hernandez, Jeffrey; Parsons, Jasón G.; Gardea‐Torresdey, Jorge L.

doi:10.1016/j.microc.2010.05.005

Cited by 85 publications

(25 citation statements)

References 31 publications

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“…In addition, geopolymers, activated clays, chemical precipitation, and co-precipitation with metal hydroxides have also been investigated for the removal of chromium(VI) and chromium(III) from aqueous solution [8, 26, 27]. Other types of removal methods include: extraction, and ultrafiltration.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics, kinetics, and activation energy studies of the sorption of chromium(III) and chromium(VI) to a Mn3O4 nanomaterial

Cantu¹,

Remes²,

Reyna³

et al. 2014

Chemical Engineering Journal

121

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In this study, a manganese oxide, Mn3O4 was used to remove chromium(III) and chromium(VI) from aqueous solutions. The Mn3O4 nanomaterial was synthesized through a precipitation method, and was characterized using XRD, which confirmed the material had a crystal structure similar to hausmannite. In addition, using Scherrer’s equation it was determined that the nanomaterial had an average grain size of 19.5 ± 1.10 nm. A study of the effects of pH on the binding of chromium(III) and chromium(VI) showed that the optimum binding pH was 4 and 3 respectively. Batch isotherm studies were performed to determine the binding capacity of chromium(III), which was determined to be 18.7 mg/g, 41.7 mg/g, and 54.4 mg/g respectively for 4°C, 21°C, and 45°C. Chromium(VI) on the other hand had lower binding capacities of 2.5 mg/g, 4.3 mg/g, and 5.8 mg/g for 4°C, 21°C, 45°C, respectively. Thermodynamic studies performed indicated the sorption process was for the most part controlled by physisorption. The ΔG for the sorption of chromium(III) and Chromium(VI) ranged from −0.9 to −13 kJ/mol, indicating a spontaneous reaction was occurring. The enthalpy indicated a endothermic reaction was occurring during the binding and show ΔH values of 70.6 and 19.1 kJ.mol for chromium(III) and Chromium(VI), respectively. In addition, ΔS for the reaction had positive values of 267 and 73 J/mol for chromium(III) and chromium(VI) which indicate a spontaneous reaction. In addition, the sorption process was found to follow pseudo second order kinetic and the activation energy studies indicated the binding process occurred through chemisorption.

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Section: Introductionmentioning

confidence: 99%

Thermodynamics, kinetics, and activation energy studies of the sorption of chromium(III) and chromium(VI) to a Mn3O4 nanomaterial

Cantu¹,

Remes²,

Reyna³

et al. 2014

Chemical Engineering Journal

121

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“…Possible reductants for Se(IV) also include zerovalent iron (Olegario et al, 2010), sodium dithionite (Geoffroy and Demopoulos, 2009), ascorbic acid (Shaker, 1996) and iodide (Ericzon et al, 1990). Many technological applications involving some of the above reductants have been proposed for the removal of selenium from process and mine wastewater and agricultural drainage water (Murphy, 1988;Zingaro et al, 1997;Zhang et al, 2008;Gonzalez et al, 2010) as well as for bioremediation of polluted sites (Hunter and Kuykendall, 2005;Antonioli et al, 2007;Ikram and Faisal, 2010). Recently, Geoffroy and Demopoulos (2011) investigated the removal of Se(IV) from wastewaters by precipitation with sodium sulfide.…”

Section: Introductionmentioning

confidence: 99%

The reduction of selenium(IV) by hydrogen sulfide in aqueous solutions

Pettine¹,

Gennari²,

Campanella³

et al. 2012

Geochimica et Cosmochimica Acta

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“…Recent study on selenium removal using MgO sheets showed adsorption capacity of Se(IV) 103.52 mg/g and Se(VI) 10.58 mg/g [22]. Se(IV) Langmuir adsorption capacity of MNP@hematite is 25.0 mg/g, MNP core 15.3 mg/g, magnetic nanoparticle-graphene oxide 23.8 mg/g [81], Al(III)/SiO2 20.4 mg/g [82], a-Fe2O3 17.9 mg/g [83], Fe/Si coprecipitates 17.4 mg/g [20], MIO/MWCNTs 13.1 mg/g [21], CuFe2O4 14.1 mg/g [19], and iron manganese oxide 6.57 mg/g [15].…”

Section: Selenium Removal Using Bmdcmentioning

confidence: 99%

“…Adsorption by metal oxides of iron and aluminum has shown promise in selenium removal [10]. Other materials like Mg/Fe hydrotalcite type compounds, hematite, magnetite, iron-coated GAC, and magnetic Fe/Mn oxide nanomaterials also have high affinity for selenium [11][12][13][14][15]. Adsorbents such as sulphuric acid-treated peanut shell, hydrocalumite, ettringite, AlPO 4 , biopolymeric materials, aluminum-based water treatment chemicals, hardened cement paste, cement minerals, aluminum oxides, iron oxyhydroxides, iron-coated sand, and zero valent iron [16][17][18][19][20][21][22][23] have also been tested for Se removal.…”

Section: Introductionmentioning

confidence: 99%

Bimetallic Oxide Nanohybrid Synthesized from Diatom Frustules for the Removal of Selenium from Water

Thakkar

Mitra

2017

Journal of Nanomaterials

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Frustules or the rigid amorphous silica cell wall of unicellular, photosynthetic microalgae with unique porous architecture has been used to synthesize a composite by immobilizing zirconium and iron oxides on its surface and in the pores. This was effective for removal of Se from water, which is an emerging contaminant that is a micronutrient at low concentrations but toxic at high concentrations. The adsorption isotherms followed both Langmuir and Freundlich models, and the composite was regenerable. The Langmuir maximum adsorption capacity for Se(IV) ( ) was 227 mg/g, which is among the highest ever reported. The research findings highlight the synthesis of bimetallic composite as well as the potential of diatoms as hosts for nanomaterials for use in water treatment.

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A study of the removal of selenite and selenate from aqueous solutions using a magnetic iron/manganese oxide nanomaterial and ICP-MS

Cited by 85 publications

References 31 publications

Thermodynamics, kinetics, and activation energy studies of the sorption of chromium(III) and chromium(VI) to a Mn3O4 nanomaterial

Thermodynamics, kinetics, and activation energy studies of the sorption of chromium(III) and chromium(VI) to a Mn3O4 nanomaterial

The reduction of selenium(IV) by hydrogen sulfide in aqueous solutions

Bimetallic Oxide Nanohybrid Synthesized from Diatom Frustules for the Removal of Selenium from Water

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