Search results for: Lavinia Lupa

Items from 1 to 14 out of 14 results

article

Use of highly stable phosphonate coordination polymers as adsorbents for wastewater

Aurelia Visa, Gheorghe Ilia, Lavinia Lupa, Bianca Maranescu

Applied Organometallic Chemistry > 35 > 5 > n/a - n/a

A series of coordination polymers (CPs) based on phosphonates, M‐VP, and M‐Phen‐VP (M = Ce, La, Phen = 1,10‐phenanthroline, Im‐imidazole, VP = vinylphosphonate) were obtained by hydrothermal reactions in different conditions: room temperature, 75°C, 180°C, at pH 1.5–7 aqueous solutions. The materials were characterized by Fourier‐transform infrared (FTIR), X‐ray powder diffraction, and thermogravimetric...

article

Zn–Al–CO₃ layered double hydroxides prepared from a waste of hot-dip galvanizing process

Laura Cocheci, Lavinia Lupa, Marius Gheju, Alin Golban, more

Clean Technologies and Environmental Policy > 2018 > 20 > 5 > 1105-1112

Hot-dip galvanizing process is used worldwide to protect the steel or iron pieces from corrosion. This process is a large generator of waste, considered one of the so-called dirty industries. One of the important wastes, in terms of quantity, is zinc ash that contains a mixture of metallic zinc and zinc oxide with a total content of zinc between 70 and 90%. The aim of this study is the preparation...

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

Thermal and spectroscopic analysis of Co(II)–Fe(III) polyglyoxylate obtained through the reaction of ethylene glycol with metal nitrates

Mircea Niculescu, Mihai-Cosmin Pascariu, Cornelia Muntean, Viorel Sasca, more

Journal of Thermal Analysis and Calorimetry > 2018 > 131 > 1 > 127-136

The synthesis and thermal and spectroscopic studies of a new Co^II–Fe^III heteropolynuclear coordination compound are presented. The in situ oxidation product of ethylene glycol plays the role of ligand. Under specific working conditions, the reaction of ethylene glycol with Fe^III and Co^II nitrates in dilute acid solutions occurs with the oxidation of the former to glyoxylic acid, coordinated to the...

article

Synthesis, characterization of nanosized CoAl₂O₄ and its electrocatalytic activity for enhanced sensing application

Raluca Dumitru, Florica Manea, Lavinia Lupa, Cornelia Păcurariu, more

Journal of Thermal Analysis and Calorimetry > 2017 > 128 > 3 > 1305-1312

Nanosized cobalt aluminate (CoAl₂O₄) was prepared by thermolysis of heteronuclear coordination compound, namely [Al₂Co(C₂O₄)₄(OH₂)₆]. The synthesized precursor was characterized by chemical analysis, vibrational spectra and thermal analysis. The cobalt aluminate obtained after a heating treatment of the precursor at 700 °C was characterized by IR, XRD, TEM coupled with SAED measurements. Two types...

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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