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Open access

Yun-Yu Chen

References [1] Xu H., Perumal S. X., Du N. et al.: Interfacial adsorption of antifreeze proteins: a neutron reflection study. Biophysical J. 94(2008), 1, 4405-4413. [2] Dan A., Wüstneck R., Krägel J. et al.: Interfacial adsorption and rheological behavior of ß-casein at the water/hexane interface at different pH. Food Hydrocolloid. 34(2014),193-201. [3] Kobyłecki R.: Carbonization of biomass - an efficient tool to decrease the emission of CO2. Microsc. Res. Techniq. 34(2013), 3, 185-195. [4

Open access

R. Kowalik

Abstract

The different voltammetry techniques were applied to understand the process of selenium deposition from sulfate solution on gold polycrystalline electrode. By applying the cycling voltammetry with different scan limits as well as the chronoamper-ometry combined with the cathodic and anodic linear stripping voltammetry, the different stages of the deposition of selenium were revealed. It was found that the process of reduction of selenous acid on gold surface exhibits a multistage character. The cyclic voltammetry results showed four cathodic peaks which are related to the surface limited phenomena and which coincide with the bulk deposition process. The fifth cathodic peak is related to the reduction of bulk deposited Se0 to Se-2 ions. Furthermore, the connection of anodic peaks with cathodic ones confirmed the surface limited process of selenium deposition, bulk deposition and reduction to Se-2. Additionally, the cathodic linear stripping voltammetry confirms the process of H2SeO3 adsorption on gold surface. The experiments confirmed that classical voltammetry technique proved to be a very powerful tool for analyzing the electrochemical processes related with interfacial phenomena and electrodeposition.

Open access

Rita Földényi and Aurél Marton

Abstract

A common feature of the chemical processes of the hydrosphere and water treatment plants is that essentially the same types of chemical equilibrium reactions occur in both fields. These equilibria could be acid/base, complexation, redox, precipitation, and interfacial processes. Since these reactions may also occur in combination, the aqueous environments are unavoidably multispecies systems. Due to multiple equilibria, the state of aggregation, the state of oxidation, as well as the electric charge of the species may change dramatically. Calculation of the equilibrium concentration of the species is facilitated by the availability of analytical, stoichiometric, and thermodynamic information that are consistently organised into an ASTI matrix. The matrix makes it possible to apply a uniform algebraic treatment for all occurring equilibria even, if later on, further reactions have to be included in the chemical model. The use of the ASTI matrix enables us to set up the necessary mass balance equations and equilibrium relationships, which together form a non-linear system of equations (NLSE). The goal of our paper is to show that the use of the ASTI matrix approach in cooperation with the powerful engineering calculation software, MATHCAD14, results in fast and easy handling of the NLSE-s and, consequently, the calculations of speciation in aqueous systems. The paper demonstrates the method of application in three examples: the calculation of the pH dependence of the solubility of calcite in closed and open systems, the calculation of the pH and pε in a system where acid/base reactions, complexation equilibria, and redox equilibria occur, and a study of adsorption of lead ions on aluminium oxide.

Open access

Jan Pelipenko, Julijana Kristl, Romana Rošic, Saša Baumgartner and Petra Kocbek

liquid interfaces, Adv. Colloid Interfac.   108-109 (2004) 63-71; DOI: 10.1016/j.cis.2003.10.011. V. B. Fainerman, E. H. Lucassen-Reynders and R. Miller, Description of the adsorption behaviour of proteins at water/fluid interfaces in the framework of a two-dimensional solution model, Adv. Colloid Interfac.   106 (2003) 237-259; DOI: 10.1016/S0001-8686(03)00112-X. D. Langevin, Influence of interfacial rheology on foam and emulsion properties, Adv. Colloid Interfac.   88 (2000) 209-222; DOI: 10.1016/S0001

Open access

Szymon Kuczyński

References Chen J-H, Estimation of total hydrocarbon in the presence of capillary condensation for unconventional shale reservoirs, SPE 164468 Clarkson, C.R. (2013) Modelling of supercritical fluid adsorption on organic-rich shales and coal, SPE 164532 Danesh A.,S. Dandekar A. Y., Todal A.C. , Sarkar R., 1991, A Modified Scaling Law and Parachor Method Approach for Improved Prediction of Interfacial Tension of Gas-Condensate System, SPE 2270 Defay R., Prigogine I., (1966). Surface Tension and

Open access

Magdalena Bielawska and Anna Zdziennicka

References [1] M. J. Rosen, Surfactants and Interfacial Phenomena, Wiley- Interscience, New York, 2004. [2] R. Zana, Adv. Colloid Interface Sci., 57, 1-64, (1995). [3] W. R. Moorer, Int. J. Dent. Hyg., 1(3), 138-142, (2003). [4] F. A. van Engelenburg, F. G. Terpstra, H. Schuitemaker, W. R. Moorer, J. Hosp. Infect., 51(2), 121-5, (2002). [5] A. Chodzińska, A. Zdziennicka, B. Jańczuk, J. Sol. Chem., 41, 2226-2245, (2012). [6] Y. F. Yano, J. Colloid Interface Sci

Open access

Szilvia Joó, Judit Tóth and Rita Földényi

., and Czinkota Gy., 2004. The determination of particle size distribution (PSD) of clayey and silty formations using the hydrostatic method. Acta Mineralogica-Petrographica, 45, 29-34. Kretzschmar R., Robarge W.P., and Weed S.B., 1993. Flocculation of kaolinitic soil clays: Effects of humic substances and iron oxides. Soil Sci. Soc. Am. J., 57, 1277-1283. Majzik A. and Tombácz E., 2007. Interaction between humic acid and montmorillonite in the presence of calcium ions I. Interfacial and aqueous phase equilibria: Adsorption and complexation. Org. Geochem

Open access

Stanislaw Nagy and Jakub Siemek

of Chemical Process - the General Dominant Eigenvalue Method. AIChE J.,Vol. 21, No. 3, 528-533. Danesh A.S., Dandekar A.Y., Todal A.C., Sarkar R., 1991. A Modified Scaling Law andParachor Approach for Improved Prediction of Interfacial Tension of Gas-Condensate System. SPE 2270. Defay R., Prigogine I., 1966. Surface Tension and Adsorption. Longmans, London. Derouane E.G., 2007. On the physical state of molecules in microporous solids. Microporous and Mesoporous Materials. 104. 46-51. Devegowda D., Sapmanee K., Civan F

Open access

P. Thamilarasu, G. Kumar, R. Tamilarasan, V. Sivakumar and K. Karunakaran

.02.026. Sharma, Y.C. & Weng, C.H. (2007). Removal of chromium (VI) from water and wastewater by using riverbed sand: Kinetic and equilibrium studies, J. Hazard. Mater. 142, 449-454. DOI:10.1016/j.jhazmat.2006.08.078. Bishnoi, N.R., Bajai, M., Sharma, N. & Gupta, A. (2004). Adsorption of Cr(VI) on activated rice husk carbon and activated alumina, Bioresour. Technol. 91, 305-307. DOI:10.1016/S0960-8524(03)00204-9. Sharma, Y.C. (2001). Effect of Temperature on interfacial adsorption of Cr(VI) on Wollastonite, J. Colloid

Open access

V. N. Narwade and R. S. Khairnar

, S. Di Gennaro, A. Lettino, A. Palma, P. Ragone, and S. Fiore, “Removal of Mn from aqueous solution using fly ash and its hydrothermal synthetic zeolite”, J. Environ. Manage. 137, 16‒22 (2014). [5] S. Rengaraj and S.H. Moon, “Kinetics of adsorption of Co (II) removal from water and wastewater by ion exchange resins”, Water. Res. 36 (7), 1783-1793 (2002). [6] D. Baralkiewicz and J. Siepak, “Chromium, nickel and cobalt in environmental samples and existing legal norms”, Pol. J. Environ. Stud. 8 (8), 201‒208 (1999). [7