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A sorption study of bisphenol A in aqueous solutions on pristine and oxidized multi-walled carbon nanotubes

100%

Senin R. M. , Ion I. , Ion A. C.

Polish Journal of Environmental Studies

2018

tom 27

nr 5

Environmental protection draws great attention worldwide due to the release of various harmful pollutants that represent risks or threats to animals and humans. Among these pollutants, endocrinedisrupting chemicals (EDCs) as environmental contaminants interfere with the normal hormonal functions in wildlife and humans. This study proposes multi-walled carbon nanotubes – (MWCNTs) pristine and oxidized, and weathered for one year in environmental conditions – as sorbents for bisphenol A (BPA) from aqueous solution. Kinetic and isotherm models are examined. Better sorption capacities are shown for the functionalized MWCNTs-COOH because of the two types of predominating interactions that take place: electrostatic and π-π interactions. The Langmuir isotherm model fit better than the Freundlich one, showing that the adsorption of BPA on MWCNTs is a monolayer adsorption on homogeneous surfaces.

Regarding the Influence of High Frequency Combustion Instabilities on Operation of Solid Rocket Motors

100%

Safta D. , Vasile T. , Ion I.

Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa

2011

tom Vol. 2, Nr 1 (3)

7-24

High frequency combustion instabilities imply a major risk for the solid rocket motor's stable operation and they are directly linked to the response of the solid propellant to the pressure coupling. Our paper aims at defining a linearized onedimensional flow study model of the solid propellant rocket motors' disturbed functioning analysis. Experimental researches were done with an adequate setup, built and improved in our lab, functioning on the basis of the nozzle throat intermittent modulating technique developed by ONERA researchers, able to evaluate the propellant response by the interpretation of the pressure oscillations damping in terms of propellant response.