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Browsing by Subject "Adsorption"

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    • Article  

      Activated biochar derived from cactus fibres - Preparation, characterization and application on Cu(II) removal from aqueous solutions 

      Hadjittofi, Loukia; Prodromou, Melpomeni; Pashalidis, Ioannis (2014)
      The adsorption efficiency of activated biochar prepared from cactus fibres regarding the removal of Cu(II) from aqueous solutions has been investigated as a function of various physicochemical parameters (e.g. pH, initial ...

    • Article  

      Adsorption of hexavalent chromium on dunite 

      Demetriou, Antri; Pashalidis, Ioannis (2011)
      The paper presents and discusses the effect of various physicochemical parameters (e.g. pH, ionic strength, Cr(VI) initial concentration, amount of the adsorbent, temperature and contact time between metal ion and adsorbent) ...

    • Article  

      Adsorption of nitrogen and water vapour by activated Kevlar® chars 

      Freeman, J. J.; Tomlinson, J. B.; Sing, K. S. W.; Theocharis, Charis R. (1993)
      Fibrous activated carbons were prepared from Kevlar® (i.e. poly (p-phenylene terephthalamide), in the form of a commercially available woven textile. The cloth was carbonised in nitrogen and activated in either steam or ...

    • Article  

      Adsorption of nitrogen and water vapour by activated Nomex® chars 

      Freeman, J. J.; Tomlinson, J. B.; Sing, K. S. W.; Theocharis, Charis R. (1995)
      Fibrous activated carbons were prepared from Nomex® poly(m-phenylene isophthalamide), in the form of a commercially available woven textile. After carbonisation in nitrogen and activation in either carbon dioxide or steam ...

    • Article  

      Adsorption of trivalent lanthanides by marine sediments 

      Liatsou, Ioanna; Efstathiou, Maria; Pashalidis, Ioannis (2015)
      The interaction of Eu(III) with two different types of marine sediments has been investigated as a function of various parameters (e.g. pH, [Eu(III)]o, I, humic acid) to evaluate their effect on the Eu(III) adsorption. The ...

    • Article  

      Adsorptive removal of U(VI) and Th(IV) from aqueous solutions using polymer-based electrospun PEO/PLLA fibrous membranes 

      Savva, Ioanna; Efstathiou, Maria; Krasia‐Christoforou, Theodora; Pashalidis, Ioannis (2013)
      Fibrous membranes based on poly(ethylene oxide) and poly(l-lactide) fabricated by electrospinning were evaluated for the first time as substrates for the adsorption of tetravalent thorium (Th(IV)) and hexavalent uranium ...

    • Article  

      Adsorptive removal of U(VI) and Th(IV) from aqueous solutions using polymer-based electrospun PEO/PLLA fibrous membranes 

      Savva, I.; Efstathiou, M.; Krasia-Christoforou, T.; Pashalidis, I. (2013)
      Fibrous membranes based on poly(ethylene oxide) and poly(l-lactide) fabricated by electrospinning were evaluated for the first time as substrates for the adsorption of tetravalent thorium (Th(IV)) and hexavalent uranium ...

    • Article  

      Amphiphilic model conetworks based on cross-linked star copolymers of benzyl methacrylate and 2-(dimenthylamino)ethyl methacrylate: Synthesis, characterization, and DNA adsorption studies 

      Achilleos, Demetra S.; Georgiou, Theoni K.; Patrickios, Costas S. (2006)
      Six amphiphilic model conetworks of a new structure, that of cross-linked "in-out" star copolymers, were synthesized by the group transfer polymerization (GTP) of the hydrophobic monomer benzyl methacrylate (BzMA) and the ...

    • Article  

      Boron adsorption on alumina (Al2O3) and magnesia (MgO) in aqueous solutions: A comparative study 

      Konstantinou, M.; Kasseta, G.; Pashalidis, Ioannis (2006)
      The adsorption of boron on alumina (Al2O3) and magnesia (MgO) has been investigated in aqueous solutions as a function of pH, boron concentration, amount of adsorbent, ionic strength and temperature. Analysis of the ...

    • Article  

      CO adsorption on transition metal clusters: Trends from density functional theory 

      Zeinalipour-Yazdi, Constantinos D.; Cooksy, A. L.; Efstathiou, Angelos M. (2008)
      This work reports for the first time the trends for carbon monoxide (CO) chemisorption on transition metal clusters present in supported metal catalysts. In particular, the energetic, structural and infrared adsorption ...

    • Article  

      A comparative study of the adsorption of uranium on commercial and natural (Cypriot) sea sand samples 

      Efstathiou, Maria; Pashalidis, Ioannis (2013)
      The adsorption of hexavalent uranium on two different types of sea sand [e.g. a local, Cypriot (N-SS) and a commercially available marine sediment (C-SS)] has been investigated as a function of pH, initial metal concentration, ...

    • Article  

      A comparative study of the steam reforming of phenol towards H2 production over natural calcite, dolomite and olivine materials 

      Constantinou, D. A.; Fierro, José Luis García; Efstathiou, Angelos M. (2010)
      Pre-calcined (air, 850 °C) naturally occurring calcite, dolomite and olivine materials were studied for phenol steam reforming towards H2 production. The effect of reaction temperature, feed volume flow rate, and hydrogen ...

    • Article  

      Competitive adsorption of boric acid and chromate onto alumina in aqueous solutions 

      Demetriou, Antri; Pashalidis, Ioannis (2014)
      The competitive adsorption of boric acid and chromate from aqueous solutions by alumina has been investigated by spectrophotometry at pH 8, ionic strength = 0.0, 0.1 and 1.0 M NaClO4, T = 22 ± 3°C and under normal atmospheric ...

    • Article  

      Control of the morphology of crystalline calcium hydroxide 

      Theocharis, Charis R.; Pashalidis, Ioannis; Jordan, Stephanie L.; Gray, A. C.; Yeates, D. (2001)
      The reaction of solid calcium hydroxide with liquid or gaseous methanol, ethanol and toluene, and the effect this has on the surface properties of the solid was examined, as well as the modification of crystal habit by the ...

    • Article  

      Copper Binding by Activated Biochar Fibres Derived from Luffa cylindrica 

      Liatsou, Ioanna; Constantinou, P.; Pashalidis, Ioannis (2017)
      The adsorption of copper (Cu(II)) from aqueous solutions by activated Luffa cylindrica biochar fibres has been investigated by means of batch equilibrium experiments and FTIR spectroscopy. The effect of various physicochemical ...

    • Article  

      Copper(II) removal from aqueous solutions by adsorption on non-treated and chemically modified cactus fibres 

      Prodromou, Melpomeni; Pashalidis, Ioannis (2013)
      The adsorption efficiency of a biomass by-product (cactus fibres) regarding the removal of copper(II) from aqueous solutions has been investigated before and after its chemical treatment. The chemical treatment of the ...

    • Article  

      The effect of sorbed toluene on the surface properties of calcium hydroxide 

      Pashalidis, Ioannis; Theocharis, Charis R. (1998)
      The surface properties of commercial grade calcium hydroxide were studied by nitrogen adsorption isotherm analysis, FTIR spectroscopy (KBr transmission and reflectance) and TGA analysis before and after toluene adsorption. ...

    • Article  

      Effects of sol-gel synthesis on 5Fe-15Mn-40Zn-40Ti-O mixed oxide structure and its H2S removal efficiency from industrial gas streams 

      Polychronopoulou, Kyriaki; Efstathiou, Angelos M. (2009)
      A novel Fe-Mn-Zn-Ti-O mixed metal oxide has been developed for efficient low-temperature (25-50°C) removal of H2S from a gas mixture containing 600 ppm H2S, 25 vol% H2, 7.5 vol % CO 2, and 1-3 vol% H2O that simulates typical ...

    • Article  

      Equilibrium ion exchange studies of Zn2+, Cr3+, and Mn2+ on natural bentonite 

      Stylianou, Marinos A.; Inglezakis, Vassilis J.; Loizidou, Maria D.; Agapiou, Agapios; Itskos, Grigorios (2016)
      Bentonite is a clay mineral often used in ion exchange processes due to its high ion exchange capacity. In the present study, a commercially available in Greece market bentonite was obtained and characterized by XRD, XRF, ...

    • Article  

      Evaluation of electrospun polymer-Fe3O4 nanocomposite mats in malachite green adsorption 

      Savva, I.; Marinica, O.; Papatryfonos, C. A.; Vekas, L.; Krasia-Christoforou, T. (2015)
      Magnetoactive nanocomposite fibers, based on poly(ethylene oxide) (PEO), poly(l-lactide) (PLLA) and pre-formed oleic acid-coated magnetite nanoparticles (OA·Fe3O4), were fabricated by electrospinning and evaluated for the ...

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