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Charakterystyka dyspersji emulsji stabilizowanych cząstkami bentonitu

100%

Zander L. , Wołkowiak J. , Warechowski J. , Zander Z. , Dajnowiec F.

2006

tom Nr 6s

253-255

Viscosity, droplet size and stability against creaming for emulsions stabilized by bentonite particles were investigated. The dispersion system was obtained by means of ultrasound energy. An increase of oil content in the oil phase fraction caused an increase in viscosity arid the mean particle diameter. Simultaneously emulsions were less stable. On the other hand, the greater was the bentonite concentration the better was the stability. In this case also a smaller size of submicron particles was obtained.

Efficient nitrate adsorption from water by aluminum powder. Kinetic, equilibrium and influence of anion competition studies

67%

Fakhri Y. , Kakavandi B. , Safaei Z. , Asadi A. , Mohseni S. M. , Golestanifar H.

2018

tom Vol. 44, nr 3

19--31

The feasibility of aluminum powder (with particle size of 75–150 μm) for nitrate removal from aqueous solutions has been investigated. Adsorption was examined in function of initial nitrate concentration, contact time, pH and influence of other interfering anions. Maximum nitrate removal occurred at equilibrium pH of 10. The kinetics of adsorption of nitrate ions was discussed based on three kinetic models, namely: the pseudo-first order, the pseudo-second order and the intraparticle diffusion model. The experimental data fitted the pseudo-second order kinetic model very well; the rate constant was 4x10–4 g/ (mg·min) at the concentration of NO3- of 100 mg/dm3. The adsorption data followed both Langmuir (R2 = 0.808) and Freundlich (R2 = 0.865) isotherms probably due to the real heterogeneous nature of the surface sites involved in the nitrate uptake. The maximum sorption capacity of aluminum powder for nitrate adsorption was found to be ca. 45.2 mg/g at room temperature. The results indicate that aluminum powder is an interesting alternative for nitrate removal from the water.