Petru Negrea

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...

chapter

Comparative Study of Knowledge in Environmental Problems in the Context of Various Population Groups in Two EU Member States

Alfa Xenia Lupea, Corina Samoilă, Petru Negrea, Alina Gharibeh Branic, more

NATO Science for Peace and Security Series C: Environmental Security > The Role of Ecological Chemistry in Pollution Research and Sustainable Development > Risk Assessment, Mitigation Measures and Environmental Awareness > 285-293

In this paper the results of the comparative study carried out in two countries members of the EU are presented. These countries, respectively Austria and Romania have adhered to the European Union in 1995, respectively in 2007. Four sets of questions have been elaborated, each set containing 20 questions, which were answered by different categories of education. The questions followed the main environmental...

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

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

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

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

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...

article

Synthesis and Characterization of Phosphonate Ester/Phosphonic Acid Grafted Styrene−Divinylbenzene Copolymer Microbeads and Their Utility in Adsorption of Divalent Metal Ions in Aqueous Solutions

Adriana Popa, Corneliu-Mircea Davidescu, Petru Negrea, Gheorghe Ilia, more

Industrial & Engineering Chemistry Research > 2008 > 47 > 6 > 2010 - 2017

article

Studies on the thermal behavior of a complex mineral fertilizer of nitrophosphate type

Cornelia Muntean, Waltraut Brandl, Aurel Iovi, Petru Negrea

Thermochimica Acta > 2005 > 439 > 1-2 > 21-26

This paper presents some studies on the thermal behavior of a complex mineral fertilizer of nitrophosphate type. The crystalline phases present in the initial fertilizer have been identified by means of X-ray diffractometry: NH ₄ NO ₃ , NH ₄ H ₂ PO ₄ and Ca(NH ₄ ) ₂ (HPO ₄ ) ₂ ·H ₂ O. The processes occurring in the fertilizer...

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Search results for: Petru Negrea

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

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

Comparative Study of Knowledge in Environmental Problems in the Context of Various Population Groups in Two EU Member States

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

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

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

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

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

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

Synthesis and thermal behavior of double copper and potassium pyrophosphate

Synthesis and Characterization of Phosphonate Ester/Phosphonic Acid Grafted Styrene−Divinylbenzene Copolymer Microbeads and Their Utility in Adsorption of Divalent Metal Ions in Aqueous Solutions

Studies on the thermal behavior of a complex mineral fertilizer of nitrophosphate type

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