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State G.,National College Ienachita Vacarescu | Popescu I.V.,University Valahia of Targoviste | Radulescu C.,University Valahia of Targoviste | Macris C.,National College Constantin Cantacuzino | And 4 more authors.
Bulletin of Environmental Contamination and Toxicology | Year: 2012

Our study was dedicated to the analysis of air pollution level with metals in Dambovita County, Romania; maps of the concentration distributions for air pollutants were drawn; statistical analysis includes calculation of the background concentrations and the contamination factors. The highest values of the contamination factor CF is 63.1 ± 6.63 for mosses samples and 33.12 ± 3.96 for lichens and it indicates extreme contaminations in the surroundings of steel works and an electric plant. The comparison of the distribution maps for Cr, Cu, Fe, Ni, Pb and Zn concentrations enables the identification of the pollution sources, the limits of areas with very high levels of pollution, the comparison of the concentration gradients in some areas and the influence of woodlands on the spread of pollutants through the air. © Springer Science+Business Media, LLC 2012.

Radulescu C.,University Valahia of Targoviste | Stihi C.,University Valahia of Targoviste | Popescu I.V.,University Valahia of Targoviste | Popescu I.V.,Multidisciplinary Research Institute for Science and Technologies | And 2 more authors.
Revista de Chimie | Year: 2010

The use of cheap and ecofriendly adsorbents, as: hemp fibres, cellolignine, peat and cotton, have been studied as an alternative substitution ofAOPs for the removal of some cationic dyes with compact condensed structures from textile wastewater. The sorption capacity of adsorbents was evaluated spectrometricaly and removal degree for cationic dyes was calculated, as well as Langmuir and Freundlich models were applied to describe the sorption isotherm and the characteristic parameters are calculated. A kinetic study concerning sorptionldesorption process was elaborated.

Radulescu C.,Universitatea Valahia din Targoviste | Radulescu C.,University Valahia of Targoviste | Ionita I.,Universitatea Valahia din Targoviste | Ionita I.,University Valahia of Targoviste | And 4 more authors.
Industria Textila | Year: 2010

In this paper, a photo-stabilization alternative is presented for the cationic dyes applied to the poly-acrylic fibres, Melana type. In order to increase the dyes light fastness and to photo-stabilize the un-dyed and dyed fibres, the UV absorber 2-(2′-hydroxy-5′-methylphenyl)-benzotriazole was used. The cationic dyes derived by the compact condensed systems with thiazolic ring and UV absorber uptake, and the light and sublimation fastness of the dyed poly-acrylic fibres were determined and compared with thoso obtained for the corresponding fibres dyed in the absence of an UV absorber. The UV absorber was applied to the fibre by using different procedures: directly in the dye-bath anc after the treatment of the fibres dyed. The tinctorial efficiency of the cationic dyes applied to poly-acrylic fibres was analyzed as well. The research shows that the 2-(2′-hydroxy-5′-methylphenyl)-benzotriazole absorber introduction in the cationic dyes leads to the increment of dyes absorption capacity, after exposure to UV radiations. In the UV area, the absorption intensity for the UV absorber is higher than the dyes absorption intensity; therefore, the UV radiations are absorbed by the 2-(2′-hydroxy- 5′-methylphenyl)-benzotriazole, the presence of the UV absorber moving the absorption maximum of dyes from the visible to the highest wavelength (bathochromic shift).

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