Irina Ceban Ginsari

• PhD
• Senior scientific researcher at Moldova State University Institute of Chemistry

In this paper, activated carbons obtained from walnut shells were used as adsorbents to remove nitrite ions from aqueous solutions. The novel adsorbent was obtained by modification with hydrochloric acid. The physical-chemical characteristics of activated carbons were determined from nitrogen sorption isotherms, SEM-EDX, elemental analysis, FTIR, t...

Hydrogen sulphide, nitrite, ammonium and fluoride ions in drinking water are a problem of considerable importance in Republic of Moldova, especially in small communities that have no alternative sources of available water [1,2].Among various methods used to remove pollutants in reduced form (hydrogen sulphide, nitrite ions) adsorption/oxidation on...

The presence of functional groups on the carbonaceous adsorbents plays an important role on their specific properties: acid-base character, catalytic properties, selective adsorption of metal ions etc. The present work aimed at the characterization of carbonaceous adsorbents surface chemistry (by using XPS spectroscopy and potentiometric titration)...

Activated carbons have great applicability in the conditioning of wines: discoloration, removal of foreign taste and smell, correction of organoleptic parameters, etc. The purpose of this work was to compare the structural and sorption characteristics of local vegetal activated carbon obtained from apricot stones (AC-C, Republic of Moldova) with th...

The purpose of this work was to perform adsorption experiments of organic acids (tannic acid and p-coumaric acid) from water solutions on activated carbons with different surface chemistry (AC-C obtained from apricot stones (Republic of Moldova) with a slightly basic surface - pH 8.8 and Granucol FA commercial activated carbon (Germany) with an aci...

In this study, activated carbons derived from walnut shells (CA-N) and apple wood (CA-M) were used as adsorbents to remove cobalt(II) and strontium(II) ions from aqueous solutions. The novel materials were obtained using nitric acid (CA-Mox) and nitric acid/urea mixture (CA-Mox-u, CA-Nox-u) as oxidizing agents. The physical–chemical characteristics...

Carbonaceous materials have great potential as catalyst supports since a high metal loading and dispersion can be achieved. Also, it is well known that the role of the support is not simply that of a carrier; the interaction between the active phase and the support can also affect the catalytic activity. The aim of this work was to develop catalyst...

The purpose of this work was to perform adsorption experiments of p-coumaric acid from water solutions on two activated carbons: (i) commercial activated carbon FA (Granucol, Germany) and (ii) of local origin ones AC-C, obtained from apricot stones (Republic of Moldova).

In this study, activated carbons of local origin (Republic of Moldova) from the apple wood (CA-M) and nut shells (CA-N) were oxidized with nitric acid (sample CA-Mox) and mixture of nitric acid/urea (samples CA-Mox-u and CA-Nox-u) in order to improve their ion-exchange properties. The surface chemistry was characterized by using Boehm and potentiom...

Activated carbons, owing to their versatility, are the most frequently used adsorbents. Their exceptional performance derives from a unique combination of geometrical and chemical properties. The different size and shape of pores, as well as vacancies and steps are responsible for the geometrical heterogeneities of the activated carbon surface; add...

Heavy and radioactive metals (such as Pb, Cd, As, Cs, Sr, Co, Hg etc.) are persistent pollutants with potential hazards, which are characterized with a high toxicity, difficult biodegradation, and are easily accumulated in organisms. Adsorption on active carbons is one of the procedures used for binding of toxic metals. In this study, activated car...

In this work, the results of active carbon (initial and oxidized samples) testing for removal of nitrite ions in oxic condition have been reported. The removal of nitrite ions from water was carried out in a semi-pilot plant equipped with air bubbles and a vessel for the capture of aerated NOx gases. Indigenous active carbons, produced from nut she...

Consumption of polluted water with nitrate and nitrite ions affects adversely consumer health by the occurrence of methaemoglobinemia (especially in young children) and the formation of N-nitroso compounds with carcinogenic potential. The purpose of the paper was to test a series of local active carbons for removal nitrite ions from water through t...

Composite materials resulted from impregnation of active carbons with aqueous solutions of manganese (II) chloride were studied by the methods of gas adsorption, X-ray powder diffraction, atomic absorption spectrometry, energy-dispersive X-ray spectroscopy, and scanning electron microscopy. The texture and specific characteristics of porosity, micr...

The main objective of this work was to study the modification introduced in the functionality of modified activated carbons. Carboxylic acids, lactones, anhydrides, phenolic groups, carbonyl groups and quinones can be analyzed by temperature programmed desorption experiments with mass spectrometric detection (TPD). Activated carbon obtained by phys...

Four series of samples containing manganese supported carbonaceous adsorbents were prepared. Samples of series AC-B, synthesised from the carbonaceous support with basic surface, were obtained with a yield of 50-60%, while manganese was loaded in amount of 1.44-1.65 % depending on applied method. The samples of series AC-A, synthesised from the car...