Browsing by Author "Pashalidis, Ioannis"
Now showing items 21-40 of 125
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Article
The Chemistry of Pu in Concentrated Aqueous NaCl Solution: Effects of Alpha Self-Radiolysis and the Interaction between Hypochlorite and Dioxoplutonium(VI) [1]
Pashalidis, Ioannis; Lierse, C.; Sullivan, J. C.; Kim, J. I. (1992)The reactions between dioxoplutonium(VI) and hypochlorite in aqueous solution produce the species Pu02(0H)(C10) and Pu02(C10)2. The results of spectrophotometric observations are presented and the data used to calculate ...
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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, ...
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Article
Comparative Study of the U(VI) Adsorption by Hybrid Silica-Hyperbranched Poly(ethylene imine) Nanoparticles and Xerogels
Arkas, Michael; Giannakopoulos, Konstantinos; Favvas, Evangelos P.; Papageorgiou, Sergios; Theodorakopoulos, George V.; Giannoulatou, Artemis; Vardavoulias, Michail; Giannakoudakis, Dimitrios A.; Triantafyllidis, Konstantinos S.; Georgiou, Efthalia; Pashalidis, Ioannis (MDPI, 2023)Two different silica conformations (xerogels and nanoparticles), both formed by the mediation of dendritic poly (ethylene imine), were tested at low pHs for problematic uranyl cation sorption. The effect of crucial factors, ...
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Article
A comparative study on the sorption of tri- and hexavalent actinides on sea sediments
Efstathiou, Maria; Pashalidis, Ioannis (2017)The interaction of tri- and hexavalent actinides with local, Cypriot marine sediments has been investigated as a function of initial metal concentration, before and after “coating” with natural organic matter. Evaluation ...
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Article
Competition studies of L1-deferiprone with copper and iron. Possible implications on efficacy, toxicity and new therapeutic applications
Pashalidis, Ioannis; Kontoghiorghes, G. J. (2000)
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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 ...
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Article
Competitive sorption of Cu(II) and Eu(III) ions on olive-cake carbon in aqueous solutions - A potentiometric study
Konstantinou, M.; Pashalidis, Ioannis (2010)The competitive sorption of Cu(II) and Eu(III) ions from aqueous solutions by olive-cake carbon, has been investigated by potentiometry at pH 6, I = 0.1 M NaClO4, 25°C and under normal atmospheric conditions. Evaluation ...
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Article
Competitive sorption of Cu(II), Eu(III) and U(VI) ions on dunite in aqueous solutions: A potentiometric study
Konstantinou, M.; Pashalidis, Ioannis (2010)The competitive sorption of Cu(II), Eu(III) and U(VI)) ions in aqueous solutions by dunite, has been investigated by potentiometry at pH 6, I = 0.1 M NaClO4 and 25°C. Numerical analysis of the experimental data supports ...
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Article
Competitive sorption of Cu(II), Eu(III) and U(VI) ions on TiO2 in aqueous solutions-A potentiometric study
Konstantinou, M.; Pashalidis, Ioannis (2008)The competitive sorption of Cu(II), Eu(III) and U(VI) ions in aqueous solutions by TiO2, has been investigated by potentiometry at I = 0.1 M NaClO4, 25 °C and under atmospheric conditions. For Cu(II) ions the investigation ...
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Article
A computational study of the conformations of the boric acid (B(OH)3), its conjugate base ((HO)2BO-) and borate anion (B(OH)4 -)
Stefani, D.; Pashalidis, Ioannis; Nicolaides, Athanassios V. (2008)The conformations of boric acid (1), its conjugate basis (2) and borate anion (3) have been investigated with the B3LYP, HF, MP2 and QCISD methods with a variety of basis sets. Transition-state structures connecting the ...
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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 ...
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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 ...
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Article
Copper(II) adsorption by Opuntia ficus-indica biochar fiber-MnO2 composites
Hadjiyiannis, P.; Pashalidis, Ioannis (2019)The adsorption efficiency of biochar fibers obtained from Opuntia ficus-indica cactus regarding the removal of Cu(II) ions from aqueous solutions has been investigated prior and after MnO2 surfacedeposition. The removal ...
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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 ...
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Article
Determination of aquatic radon by liquid scintillation counting and airborne radon monitoring system
Kiliari, T.; Pashalidis, Ioannis (2008)This paper presents an airborne radon monitoring (RM) system for aquatic radon determination after out-gassing of radon from the aqueous sample and compares this method with the standard ASTM method for radon analysis in ...
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Article
Determination of radium by radon emanation after EDTA-mediated sample dissolution
Liatsou, Ioanna; Pashalidis, Ioannis (2015)The applicability of radon emanation to determine radium levels in (TE)NORM after EDTA-mediated sample dissolution has been investigated by means of a closed recirculating air loop radon monitoring system. Regarding radium ...
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Conference Object
Determination of uranium concentration in ground water samples of Northern Greece
Samaropoulos, I.; Efstathiou, Maria; Pashalidis, Ioannis; Ioannidou, Alexandra (2012)The activity concentration of 238U and 234U has been determined in groundwater samples of hot springs and deep wells from the region of Northern Greece. The analysis was performed by alpha spectroscopy after pre-concentration ...
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Article
The effect of aging and natural organic matter on the Th(OH)4 solubility
Prodromou, Melpomeni; Antoniou, Stella; Pashalidis, Ioannis (2014)The solution chemistry of actinides, particularly hydrolysis, is of major importance in the design of nuclear waste repositories and in relation to nuclear fuel reprocessing cycles. In this study the formation and solubility ...
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Article
The effect of humic acid on the formation and solubility of secondary solid phases (Nd(OH)CO3 and Sm(OH)CO3)
Antoniou, Stella; Pashalidis, Ioannis; Gessner, A.; Kumke, M. U. (2011)The formation of secondary Ln(III) solid phases (e.g. Nd(OH)CO3 and Sm(OH)CO3) has been studied as a function of the humic acid (HA) concentration in 0.1M NaClO4 aqueous solution and their solubility has been investigated ...
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Article
Effect of humic acid on the solid phase stability and solubility of UO 2(OH)2
Kolokassidou, C.; Pashalidis, Ioannis (2009)The stability and solubility of UO2(OH)2 has been studied as a function of the humic acid concentration in 0.1M NaClO4, in the pH range from 4 to 7 under normal atmospheric conditions. The solid phase under investigation ...