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415 Newest Publications in central european journal of chemistry
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Treatment of soy bean process water using hybrid processes
23-10-2012 | Viktor Pauer, Edit Csefalvay, Peter Mizsey, Central European Journal of Chemistry, 2012
The soy bean process water that is a by-product of soy processing technology can be utilized with a hybrid separation system recommended and investigated in this work. The aims of the soy bean water processing are to i.) concentrate the valuable components of the soy process water and ii.) ...
The effect of chemical activation method on properties of activated carbons obtained from pine cones
23-10-2012 | Piotr Nowicki, Izabela Kuszyńska, Jacek Przepiórski, Robert Pietrzak, Central European Journal of Chemistry, 2012
A method for obtaining carbonaceous adsorbents from pine cones by chemical activation with NaOH is described. Activated carbons were obtained by two methods of activation (physical mixing and impregnation) and two variants of thermal treatment. It has been shown that pine cones can be ...
Effect of solution pH on the stability of mixed silica -alumina suspension in the presence of polyacrylic acid (PAA) with different molecular weights
23-10-2012 | Małgorzata Wiśniewska, Konrad Terpiłowski, Stanisław Chibowski, Teresa Urban, Vladimir I. Zarko, Vladimir M. Gun’ko, Central European Journal of Chemistry, 2012
The influence of solution pH (in the range 3–9) on mixed silica-alumina suspension in the absence and presence of polyacrylic acid (PAA) was studied. The composition of the adsorbent was SiO2 (97%) and Al2O3 (3%). The turbidimetry method was applied to record changes in the stability of the ...
Measurement and prediction of binary mixture flash point
23-10-2012 | Mariana Hristova, Central European Journal of Chemistry, 2012
The flash points of three binary mixtures, containing n-heptane, o-xylene, m-xylene and ethylbenzene, were measured by Pensky-Martens closed cup tester. The experimental data were compared with the calculated values using Liaw’s Model with the application of Raoult’s Law and Wilson equation. ...
Adsorption of tert-butanol at the electrode from concentrated NaClO4 solutions
23-10-2012 | Jolanta Nieszporek, Central European Journal of Chemistry, 2012
The parameters of the double layer for tert-butanol adsorption determined in the supporting electrolytes: 2 mol dm−3, 3 mol dm−3 and 4 mol dm−3 NaClO4, show an increase of tert-butanol adsorption on the mercury electrode together with the increase of NaClO4 concentration. The adsorption of ...
Determination of formaldehyde and cyanide ion in human nasal discharge by using simple spectrophotometric methods
23-10-2012 | Sylwia Narkowicz, Żaneta Polkowska, Jacek Namieśnik, Central European Journal of Chemistry, 2012
Environmental tobacco smoke (ETS) contains many toxic compounds which include substances classified as aldehydes (e.g. formaldehyde) and inorganic substances such as cyanide ions. The information on the determination of these compounds in water is available, but the monitoring data on the ...
Surface modification and adhesion improvement of polyester films
23-10-2012 | Aniello Cammarano, Giovanna De Luca, Eugenio Amendola, Central European Journal of Chemistry, 2012
Facile surface modification of polyester films was performed via chemical solutions treatment. Surface hydrolysis was carried out by means of sodium hydroxide solutions, leading to the formation of carboxylate groups. Three commercial polyester films of 100 μm in thickness were used in this ...
Variational calculations on the vibrational level structure of S0 HDCO
23-10-2012 | Svetoslav Rashev, David C. Moule, Central European Journal of Chemistry, 2012
We perform converged high precision variational calculations to determine the frequencies of the vibrational levels in S0 HDCO, extending up to 5000 cm−1 of vibrational excitation energy. For these calculations we use our specific vibrational method (recently employed for studies on H2CO and ...
Potassium trans-[bis(oxalato)diaquacobaltate(II)] tetrahydrate: synthesis, structure, potentiometric and thermal studies
23-10-2012 | Agnieszka Chylewska, Artur Sikorski, Aleksandra Dąbrowska, Lech Chmurzyński, Central European Journal of Chemistry, 2012
The title compound, trans-K2[Co(C2O4)2(H2O)2]·4H2O, was synthesised, and characterised by elemental analysis. Acid dissociation constants for the complex were determined by potentiometric titration and calculated by STOICHIO program. The crystal structure of trans-K2[Co(C2O4)2(H2O)2]·4H2O was ...
Octahedral CuII and NiII complexes manifesting with N′-[1-(pyridin-2-yl)ethylidene] acetohydrazide: Structural outlooks and spectral characteristics
23-10-2012 | Amitabha Datta, Jui-Hsien Huang, Jack K. Clegg, Pei-Hsin Liu, Sheng-Jie Chuang, Central European Journal of Chemistry, 2012
A tridentate hydrazone precursor, N′-[1-(pyridin-2-yl)ethylidene]acetohydrazide (L) (1:1 refluxed product of acetichydrazide and 2-acetylpyridine), produced two octahedral CuII and NiII derivatives, [CuL2]·NO3 (1) and [NiL2]·ClO4·H2O (2). Both are subjected to X-ray diffraction system, and ...
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