N. Timbaliuc

Moldova State University Institute of Chemistry

The thermal regeneration process of the used AG-3 activated carbon from the water treatment plant in Chisinau was studied. The regeneration process was carried out at different temperatures and for different periods of time with water vapor. To evaluate the degree of regeneration of activated carbon samples, the adsorption isotherms of benzene and...

The paper presents the results of the study of the adsorption of vitamin B6 on two samples of autochthonous activated carbon: AC-C and CAN-8. The adsorption kinetics data, determined at three values of initial concentration, show that the immobilization rate of vitamin B6 increases with increasing contact time between the two phases and is a functi...

The process of the kinetics of caffeine adsorption from aqueous solutions on activated carbon AC-0-9, obtained from apple wood, was studied. Analysis of nitrogen adsorption-desorption isotherms demonstrated that this carbon adsorbent is basically mesoporous. The pseudo-two model describes best the kinetic process, highlighting the role of functiona...

The paper presents the results of scientific research related to the study of adsorption processes of Bacillus subtilis bacteria on activated carbon obtained from apple wood. The activated carbons used have a specific BET area of about 2018 m2/g and a total sorption volume of the pores equal to 1,573 cm3/g. The study of the kinetics of the adsorpti...

This paper presents the results of scientific research on the structural parameters and the adsorption capacity of activated carbon obtained from apricot kernels (AC-A) in a fluidized layer. The obtained results highlight the fact that the described procedure allows obtaining a mesoporous carbon adsorbent with increased adsorption capacities (SBET...

Natural polyphenols are of significant morphological and physiological importance in plants. In particular, natural polyphenols have been reported to possess antioxidant, antibacterial and antifungal properties. However due to their low solubility in water, modification and improvement of physico-chemical properties of these compounds are of high i...

After oxidation of tannins (Tannins 1–3) extracted from grape seeds, Tanoxil compounds with increased solubility and enhanced antioxidant activities were synthesized. In this research, ABTS+· assay and a chemiluminescence method were used for antioxidant measurement of hydrophilic compounds (Tanoxils 1–3). It was observed that the antioxidant activ...

Efectul chemi-luminescenţei luminolului prezintă un procedeu eficace de estimare comparativă a activităţii catalitice a catalizatorilor. S-a constatat că cel mai pronunţat efect catalitic, având o intensitate a chemi-luminescenţei de 18 ori mai mare faţă de martor, posedă H-forma Al-montmorilonitului intercalat cu oligomeri de aluminiu la raportul...

An approach has been developed to determine the equilibrium model in heterogeneous aqueous systems containing a mixture of solid phases from the initial composition of the heterogeneous mixture and the equilibrium values of the pH. This approach allows to significantly reduce the quantity of measured data, properly for solubility measurements. By u...

It was noticed that the adsorption in mixt systems is less than the additivity of individual adsorption of the components due to the substitution effect of molecules on surface. This is explained by the effect caused by the surfactant to enhance the interactions between the polar groups of the dye and the functionl groups existent on the adsorbant...

Wastewater contains a wide range of harmful substances of both organic and inorganic nature. The elaboration of technologies for purification of such categories of wastewater requires the knowledge of the mechanism for sorption of organic substances and on heavy metals ions on the adsorbent specified for technological usage. In line with the above-...

The p-nitroaniline, o-nitroaniline, p-chloroaniline, o-chloroaniline and aniline removal from aqueous solutions, by active carbon retention, was experimentally studied. Four new kinds of active carbon - obtained from peach, plum and grape stones, as well as from nut shells - were used, and their physico-chemical and structural characteristics were...