Search results for: Mihaela Ciopec

Items from 1 to 12 out of 12 results

article

Removal of cadmium from aqueous solutions using inorganic porous nanocomposites

Cătălin Ianăşi, Mirela Picioruş, Roxana Nicola, Mihaela Ciopec, more

Korean Journal of Chemical Engineering > 2019 > 36 > 5 > 688-700

The present paper reports a one-pot synthesis of magnetic nanocomposites samples through acid catalyzed sol-gel method. Fe(III) acetylacetonate was used as precursor of the iron oxide phase: tetraethylortosilicate for the silica phase and polyvinyl alcohol (PVA, molecular mass 49000) as pore former. Different concentrations of Fe₂O₃ in composites matrices were prepared and studied ranging from 0%...

article

Optimizing the lanthanum adsorption process onto chemically modified biomaterials using factorial and response surface design

Andreea Gabor, Corneliu Mircea Davidescu, Adina Negrea, Mihaela Ciopec, more

Journal of Environmental Management > 2017 > 204 > P3 > 839-844

The rare metals' potential to pollute air, water, soil, and especially groundwater has received lot of attention recently. One of the most common rare earth group elements, lanthanum, is used in many industrial branches, and due to its toxicity, it needs to be eliminated from all residual aqueous solutions. The goal of this study was to evaluate the control of the adsorption process for lanthanum...

article

Adsorption performance of the organic solid support impregnated with ionic liquid in the removal process of Tl(I) from aqueous solutions

Lavinia Lupa, Adriana Popa, Ecaterina Stela Dragan, Mihaela Ciopec, more

Process Safety and Environmental Protection > 2017 > 108 > C > 67-73

In this article, we have presented the studies regarding the improvements of the adsorption performance of a styrene-12% divinylbenzene copolymer functionalized with aminophosphonate groups in the removal process of thallium ions from aqueous solutions, by impregnation of the solid support with trihexyl(tetradecyl)phosphonium chloride (Cyphos IL-101). The use of ionic liquid impregnated polymer as...

article

Ionic liquids impregnated onto inorganic support used for thallium adsorption from aqueous solutions

Lavinia Lupa, Adina Negrea, Mihaela Ciopec, Petru Negrea, more

Separation and Purification Technology > 2015 > 155 > Complete > 75-82

The present paper presents the influence of the ionic liquid nature impregnated onto Florisil upon the adsorption performance of the obtained material in the removal process of Tl(I) ions from aqueous solutions. The impregnation of the studied ionic liquid onto Florisil was realized through ultrasonication which proved to be an efficient method because is not time consuming, combine the advantages...

article

Nanocrystalline ferrites used as adsorbent in the treatment process of waste waters resulted from ink jet cartridges manufacturing

Raluca Voda, Adina Negrea, Lavinia Lupa, Mihaela Ciopec, more

Open Chemistry > 2015 > 13 > 1

Dye pollution in waste waters causes serious environmental and health risk, legislation problems and is a serious challenge to environmental scientists. In this work the treatment of waste waters resulted from ink jet cartridges manufacturing, using different nanocrystalline ferrites M^IIFe₂O₄ (M^II = Mg, Cu) as adsorbent materials, has been investigated. The ferrites were obtained by thermal decomposition...

article

Nanocrystalline ferrites used as adsorbent in the treatment process of waste waters resulted from ink jet cartridges manufacturing

Raluca Voda, Adina Negrea, Lavinia Lupa, Mihaela Ciopec, more

Open Chemistry > 2015 > 13 > 1

article

Separation of As^V from aqueous solutions using chelating polymers containing Fe^III -loaded phosphorus groups

Adina Negrea, Mihaela Ciopec, Petru Negrea, Lavinia Lupa, more

Open Chemistry > 2015 > 13 > 1

As^V ions were removed by batch equilibrium with Fe^III-loaded chelating polymers containing aminophosphinic or aminophosphonic groups. It was effectively removed As^V from a synthetic wastewater as well as from a real drinking water containing 40 μg As per liter. Sorption is best described by pseudo-second order kinetics and a Langmuir isotherm.

article

Separation of As^V from aqueous solutions using chelating polymers containing Fe^III -loaded phosphorus groups

Adina Negrea, Mihaela Ciopec, Petru Negrea, Lavinia Lupa, more

Open Chemistry > 2015 > 13 > 1

article

Synthesis, characterization, and adsorption behavior of aminophosphinic grafted on poly(styrene‐Co‐divinylbenzene) for divalent metal ions in aqueous solutions

Mihaela Ciopec, Corneliu M. Davidescu, Adina Negrea, Lavinia Lupa, more

Polymer Engineering & Science > 53 > 5 > 1117 - 1124

In the present work, two novel aminophosphinic acid ligands grafted on poly(styrene‐1%divinylbenzene) (St‐1%DVB) have been synthesized by reacting polymer precursors bearing primary amino groups with benzaldehyde (or propionaldehyde) and phenylphosphinic acid by the “one‐pot” Kabatachnik‐Fields reaction. The resins functionalized with aminophosphinic pendant groups were characterized by means of Fourier...

article

Synthesis, characterization, and Ni(II) ion sorption properties of poly(styrene-co-divinylbenzene) functionalized with aminophosphonic acid groups

Corneliu-Mircea Davidescu, Mihaela Ciopec, Adina Negrea, Adriana Popa, more

Polymer Bulletin > 2013 > 70 > 1 > 277-291

In this study, novel chelating resins containing aminophosphonic acid groups grafted on poly(styrene-co-divinylbenzene) (1 % or 15 % DVB) were obtained by “one-pot” reactions. The phosphorus contents were determined in order to calculate the degree of functionalization with pendant aminophosphonic acid groups. The fraction of repetitive units functionalized with aminophosphonic acid groups was determined...

article

Removal of As ^V by Fe ^III -Loaded XAD7 Impregnated Resin Containing Di(2-ethylhexyl) Phosphoric Acid (DEHPA): Equilibrium, Kinetic, and Thermodynamic Modeling Studies

Adina Negrea, Mihaela Ciopec, Lavinia Lupa, Corneliu M. Davidescu, more

Journal of Chemical & Engineering Data > 2011 > 56 > 10 > 3830 - 3838

article

Synthesis and thermal behavior of double copper and potassium pyrophosphate

Mihaela Ciopec, Cornelia Muntean, Adina Negrea, Lavinia Lupa, more

Thermochimica Acta > 2009 > 488 > 1-2 > 10-16

This paper presents the synthesis and thermal behavior of double copper and potassium pyrophosphate, which can be used as a PK fertilizer containing copper as micronutrient. In order to find the conditions for the synthesis of this compound from copper sulphate and potassium pyrophosphate, various Cu ²⁺ :P ₂ O ₇ ⁴⁻ molar ratios (0:1–2:1), various molar concentrations of...

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