naa a22 4500 510749291 CHVBK 20180411083058.0 cr unu---uuuuu 180411e20130601xx s 000 0 eng 10.1007/s11270-013-1598-x doi (NATIONALLICENCE)springer-10.1007/s11270-013-1598-x Manganese Oxychloride-Modified Hydrophobic Silica Targets Removal of Nitrates from Water [Elektronische Daten] [Eleftherios Halevas, Athanasios Malakopoulos, Andreas Delimitis, Vassilis Zaspalis, George Litsardakis, Athanasios Salifoglou] 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. Springer Science+Business Media Dordrecht, 2013 Nitrate adsorption-removal nationallicence Water decontamination nationallicence Hydrophobic silica nationallicence Manganese oxychloride nationallicence Surface modification nationallicence Environmental inorganic pollutants nationallicence Halevas Eleftherios Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece aut Malakopoulos Athanasios Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece aut Delimitis Andreas Chemical Process & Energy Resources Institute (CPERI), Centre for Research and Technology Hellas (CERTH), P.O. Box 60361, 57001, Thermi, Thessaloniki, Greece aut Zaspalis Vassilis Chemical Process & Energy Resources Institute (CPERI), Centre for Research and Technology Hellas (CERTH), P.O. Box 60361, 57001, Thermi, Thessaloniki, Greece aut Litsardakis George Laboratory of Materials for Electrotechnics, Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece aut Salifoglou Athanasios Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece aut Water, Air, & Soil Pollution Springer Netherlands 224/6(2013-06-01), 1-13 0049-6979 224:6<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1598-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1598-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Halevas Eleftherios Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece aut NATIONALLICENCE 700 1- Malakopoulos Athanasios Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece aut NATIONALLICENCE 700 1- Delimitis Andreas Chemical Process & Energy Resources Institute (CPERI), Centre for Research and Technology Hellas (CERTH), P.O. Box 60361, 57001, Thermi, Thessaloniki, Greece aut NATIONALLICENCE 700 1- Zaspalis Vassilis Chemical Process & Energy Resources Institute (CPERI), Centre for Research and Technology Hellas (CERTH), P.O. Box 60361, 57001, Thermi, Thessaloniki, Greece aut NATIONALLICENCE 700 1- Litsardakis George Laboratory of Materials for Electrotechnics, Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece aut NATIONALLICENCE 700 1- Salifoglou Athanasios Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/6(2013-06-01), 1-13 0049-6979 224:6<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer