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Manganese Oxychloride-Modified Hydrophobic Silica Targets Removal of Nitrates from Water

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Abstract

Poised to gain insight into nitrate adsorption and removal processes from water through employment of modified surfaces, a well-defined inorganic manganese species was used in connection with hydrophobic mesoporous silica. To this end, the surface of hydrophobic mesoporous silica was modified by coating silica with a manganese oxychloride (Mn8O10Cl3) nanoparticle layer. A sol–gel method was utilized for the synthesis of hydrophobic silica, using tetraethyl orthosilicate–methyl triethoxysilane (TEOS–MTES) as precursors. Subsequent coating with Mn8O10Cl3 took place by mixing MnCl2 and NaOH with hydrophobic silica. Physicochemical characterization of the Mn8O10Cl3-coated silica was carried out by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and N2 sorption. The achieved surface modification reduced remarkably the specific surface area by 80.7 % and influenced the ability of nitrates to adsorb on Mn-modified silica. Nitrate adsorption kinetics on Mn8O10Cl3-coated silica was studied by a batch reactor. Process parameters including pH, temperature, and initial nitrate concentration were examined thoroughly. The experimental adsorption data were fitted satisfactorily through Langmuir isotherm equations and were found to be well-represented by a pseudo-second-order kinetic model. The collective data emphasize the significance of well-defined inorganic manganese phases, coating hydrophobic silica, in optimally influencing water decontamination from pollutant nitrates.

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Acknowledgments

This work was cofinanced by the EU–ESF and Greek national funds through the NSRF-Heracleitus II program.

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Authors and Affiliations

  1. Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki, 54124, Greece

    Eleftherios Halevas, Athanasios Malakopoulos & Athanasios Salifoglou

  2. Chemical Process & Energy Resources Institute (CPERI), Centre for Research and Technology Hellas (CERTH), P.O. Box 60361, Thermi, Thessaloniki, 57001, Greece

    Andreas Delimitis & Vassilis Zaspalis

  3. Laboratory of Materials for Electrotechnics, Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, Thessaloniki, 54124, Greece

    George Litsardakis

Authors
  1. Eleftherios Halevas
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  2. Athanasios Malakopoulos
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  3. Andreas Delimitis
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  4. Vassilis Zaspalis
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  5. George Litsardakis
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  6. Athanasios Salifoglou
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Correspondence to Athanasios Salifoglou.

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Halevas, E., Malakopoulos, A., Delimitis, A. et al. Manganese Oxychloride-Modified Hydrophobic Silica Targets Removal of Nitrates from Water. Water Air Soil Pollut 224, 1598 (2013). https://doi.org/10.1007/s11270-013-1598-x

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  • DOI: https://doi.org/10.1007/s11270-013-1598-x

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