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Article ; Online: Single and simultaneous adsorption of methyl orange and phenol onto magnetic iron oxide/carbon nanocomposites

Roxana Istratie / Marcela Stoia / Cornelia Păcurariu / Cosmin Locovei

Arabian Journal of Chemistry, Vol 12, Iss 8, Pp 3704-

2019 Volume 3722

Abstract: Magnetic iron oxide/carbon nanocomposites were synthesized by a facile, one-step solvothermal method. The magnetic nanopowders were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, thermal analysis (DSC–TG), ... ...

Abstract	Magnetic iron oxide/carbon nanocomposites were synthesized by a facile, one-step solvothermal method. The magnetic nanopowders were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, thermal analysis (DSC–TG), scanning electron microscopy (SEM), specific surface area and particle size measurements, pore size distributions and magnetic properties. The magnetic nanopowders were tested as adsorbents for the removal of methyl orange (MO) and phenol (Ph) from aqueous solutions. The effects of solution pH, contact time, adsorbent dose and initial pollutants concentration on the adsorption of MO and phenol onto the investigated adsorbents were studied. A significant increase in the removal efficiency, both for MO and phenol, with the increase in the carbon content of the magnetic nanopowder was evidenced. New experimental data were provided regarding the bicomponent adsorption of MO and phenol. Pseudo-second order equation was fitted to the kinetic data and four isotherm models, namely Langmuir, Freundlich, Redlich–Peterson and Sips were used to analyze the equilibrium data in both single and binary-component solutions. The investigated adsorbents showed a higher adsorption capacity toward MO than phenol. The simultaneous adsorption of the two pollutants in bicomponent solutions indicated that the MO adsorption is practically not affected by the presence of phenol while the adsorption of phenol is significantly reduced in the presence of MO. The benefits of obtaining low-cost nanocomposites with adsorption capacity and magnetic separation tailored, effective in single and bicomponent adsorption of MO and phenol, represent strong arguments regarding their great potential for practical applications. Keywords: Magnetic iron oxides, Carbon, Nanocomposites, Simultaneous adsorption, Phenol, Methyl orange
Keywords	Chemistry ; QD1-999
Subject code	500
Language	English
Publishing date	2019-12-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Facile synthesis, characterization and magnetic properties of manganese ferrite/carbon composites

Muntean, Eliza / Cornelia Păcurariu / Marcela Stoia

Thermochimica acta. 2018 Sept. 10, v. 667

2018

Abstract: Manganese ferrite/carbon (MnFe2O4/C) composites were prepared by the thermal decomposition of Mn(NO3)2-Fe(NO3)3-polyvinyl alcohol (PVA) gels with different PVA content. Thermogravimetric analysis (TG) and differential scanning calorimetry (DSC) as well ... ...

Abstract	Manganese ferrite/carbon (MnFe2O4/C) composites were prepared by the thermal decomposition of Mn(NO3)2-Fe(NO3)3-polyvinyl alcohol (PVA) gels with different PVA content. Thermogravimetric analysis (TG) and differential scanning calorimetry (DSC) as well as the Fourier-transform infrared spectroscopy (FTIR) confirmed the redox interaction between PVA and nitrate ions at around 100 °C. The effect of experimental conditions such as annealing temperature, reaction atmosphere (air, nitrogen), opened or covered crucibles for obtaining manganese ferrite as single crystalline phase was investigated. Manganese ferrite as single crystalline phase was obtained by annealing the precursor in air at 400 °C for 3 h in covered crucibles. The saturation magnetization of MnFe2O4/C composites decreased with the increase of the carbon amount from 47.9 emu g−1 to 18.5 emu g−1 and was correlated with the PVA content. The saturation magnetization of the sample with the highest carbon content increased from 0.1 emu g−1 to 24.6 emu g−1 by growing the annealing temperature from 300 to 600 °C.
Keywords	air ; alcohols ; annealing ; carbon ; composite materials ; differential scanning calorimetry ; ferric compounds ; Fourier transform infrared spectroscopy ; gels ; ions ; magnetic properties ; nitrates ; nitrogen ; temperature ; thermal degradation ; thermogravimetry
Language	English
Dates of publication	2018-0910
Size	p. 122-131.
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	1500974-9
ISSN	0040-6031
ISSN	0040-6031
DOI	10.1016/j.tca.2018.07.015
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: CuBi 2 O 4 Synthesis, Characterization and Application in Sensitive Amperometric/Voltammetric Detection of Amoxicillin in Aqueous Solutions

Raluca Dumitru (m.Vodă) / Sorina Negrea / Cornelia Păcurariu / Adrian Surdu / Adelina Ianculescu / Aniela Pop / Florica Manea

Nanomaterials, Vol 11, Iss 740, p

2021 Volume 740

Abstract: CuBi 2 O 4 synthesized by thermolysis of a new Bi(III)-Cu(II) oxalate coordination compound, namely Bi 2 Cu(C 2 O 4 ) 4 ·0.25H 2 O, was tested through its integration within carbon nanofiber paste electrode, namely CuBi/carbon nanofiber (CNF), for the ... ...

Abstract	CuBi 2 O 4 synthesized by thermolysis of a new Bi(III)-Cu(II) oxalate coordination compound, namely Bi 2 Cu(C 2 O 4 ) 4 ·0.25H 2 O, was tested through its integration within carbon nanofiber paste electrode, namely CuBi/carbon nanofiber (CNF), for the electrochemical detection of amoxicillin (AMX) in the aqueous solution. Thermal analysis and IR spectroscopy were used to characterize a CuBi 2 O 4 precursor to optimize the synthesis conditions. The copper bismuth oxide obtained after a heating treatment of the precursor at 700 °C/1 h was investigated by an X-ray diffraction and scanning electron microscopy. The electrochemical behavior of CuBi/CNF in comparison with CNF paste electrode showed the electrocatalytic activity of CuBi 2 O 4 toward amoxicillin detection. Two potential detections, with one at the potential value of +0.540 V/saturated calomel electrode (SCE) and the other at the potential value of −1.000 V/SCE, were identified by cyclic voltammetry, which were exploited to develop the enhanced voltammetric and/or amperometric detection protocols. Better electroanalytical performance for AMX detection was achieved for CuBi/CNF using differential-pulsed and square-wave voltammetries than others reported in the literature. Very nice results obtained through anodic and cathodic currents recorded at +0.750 V/SCE and −1.000 V/SCE in the same time period using a pseudo multiple-pulsed amperometry technique showed the great potential of the CuBi/CNF paste electrode for practical applications in amoxicillin detection in aqueous solutions.
Keywords	CuBi 2 O 4 electrocatalyst ; amoxicillin ; electrochemical detection ; CuBi 2 O 4 -carbon nanofiber paste electrode ; Chemistry ; QD1-999
Subject code	290
Language	English
Publishing date	2021-03-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Synthesis and Characterization of Bioactive Magnetic Nanoparticles from the Perspective of Hyperthermia Applications

Elena-Alina Moacă / Vlad Socoliuc / Dana Stoian / Claudia Watz / Daniela Flondor / Cornelia Păcurariu / Robert Ianoș / Cristiana Iulia Rus / Lucian Barbu-Tudoran / Alexandra Semenescu / Cristian Sarău / Adelina Chevereșan / Cristina Adriana Dehelean

Magnetochemistry, Vol 8, Iss 145, p

2022 Volume 145

Abstract: Magnetic iron oxide nanoparticles were obtained for the first time via the green chemistry approach, starting from two aqueous extracts of wormwood ( Artemisia absinthium L.), both leaf and stems. In order to obtain magnetic nanoparticles suitable for ... ...

Abstract	Magnetic iron oxide nanoparticles were obtained for the first time via the green chemistry approach, starting from two aqueous extracts of wormwood ( Artemisia absinthium L.), both leaf and stems. In order to obtain magnetic nanoparticles suitable for medical purposes, more precisely with hyperthermia inducing features, a synthesis reaction was conducted, both at room temperature (25 °C) and at 80 °C, and with two formulations of the precipitation agent. Both the quality and stability of the synthesized magnetic iron oxide nanoparticles were physiochemically characterized: phase composition (X-ray powder diffraction (XRD)), thermal behavior (thermogravimetry (TG) and differential scanning calorimetry (DSC)), electron microscopy (scanning (SEM) and transmission (TEM)), and magnetic properties (DC and HF-AC). The magnetic investigation of the as-obtained magnetic iron oxide nanoparticles revealed that the synthesis at 80 °C using a mixture of NaOH and NH 3 (aq) increases their diameter and implicitly enhances their specific absorption rate (SAR), a mandatory parameter for practical applications in hyperthermia.
Keywords	specific absorption rate ; magnetic nanoparticles ; green synthesis ; Chemistry ; QD1-999
Subject code	620
Language	English
Publishing date	2022-11-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Removal of Colored Organic Pollutants from Wastewaters by Magnetite/Carbon Nanocomposites

Simona Gabriela Muntean / Maria Andreea Nistor / Eliza Muntean / Anamaria Todea / Robert Ianoş / Cornelia Păcurariu

Journal of Chemistry, Vol

Single and Binary Systems

2018 Volume 2018

Abstract: This work develops a methodology for selective removal of industrial dyes from wastewaters using adsorption technology based on magnetic adsorbents. The magnetic nanoparticles embedded within a matrix of activated carbon were tested as adsorbents for ... ...

Abstract	This work develops a methodology for selective removal of industrial dyes from wastewaters using adsorption technology based on magnetic adsorbents. The magnetic nanoparticles embedded within a matrix of activated carbon were tested as adsorbents for removal of industrial dyes from aqueous solutions. The effects of four independent variables, solution pH, initial concentration of pollutant, adsorbent dose, contact time, and their interactions on the adsorption capacity of the nanocomposite were investigated in order to optimize the process. The removal efficiency of pollutants depends on solution pH and increases with increasing the carbon content, with initial concentration of the pollutants, the temperature, and the dose of magnetite/carbon nanocomposites. Pseudo-second-order kinetic model was fitted to the kinetic data, and adsorption isotherm analysis and thermodynamics were used to elucidate the adsorption mechanism. The maximum adsorption capacities were 223.82 mg g−1 for Nylosan Blue, 114.68 mg g−1 for Chromazurol S, and 286.91 mg g−1 for Basic Red 2. The regeneration and reuse of the sorbent were evaluated in seven adsorption/desorption cycles. The optimum conditions obtained for individual adsorption were selected as starting conditions for simultaneous adsorption of dyes. In binary systems, in normal conditions, selectivity decreases in the order: Red Basic 2 > Nylosan Blue > Chromazurol S.
Keywords	Chemistry ; QD1-999
Subject code	660
Language	English
Publishing date	2018-01-01T00:00:00Z
Publisher	Hindawi Limited
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Biocompatible Magnetic Colloidal Suspension Used as a Tool for Localized Hyperthermia in Human Breast Adenocarcinoma Cells

Elena-Alina Moacă / Claudia-Geanina Watz / Vlad Socoliuc / Roxana Racoviceanu / Cornelia Păcurariu / Robert Ianoş / Simona Cîntă-Pînzaru / Lucian Barbu Tudoran / Fran Nekvapil / Stela Iurciuc / Codruța Șoica / Cristina-Adriana Dehelean

Nanomaterials, Vol 11, Iss 1189, p

Physicochemical Analysis and Complex In Vitro Biological Profile

2021 Volume 1189

Abstract: Magnetic iron oxide nanoparticles are the most desired nanomaterials for biomedical applications due to their unique physiochemical properties. A facile single-step process for the preparation of a highly stable and biocompatible magnetic colloidal ... ...

Abstract	Magnetic iron oxide nanoparticles are the most desired nanomaterials for biomedical applications due to their unique physiochemical properties. A facile single-step process for the preparation of a highly stable and biocompatible magnetic colloidal suspension based on citric-acid-coated magnetic iron oxide nanoparticles used as an effective heating source for the hyperthermia treatment of cancer cells is presented. The physicochemical analysis revealed that the magnetic colloidal suspension had a z-average diameter of 72.7 nm at 25 °C with a polydispersity index of 0.179 and a zeta potential of −45.0 mV, superparamagnetic features, and a heating capacity that was quantified by an intrinsic loss power analysis. Raman spectroscopy showed the presence of magnetite and confirmed the presence of citric acid on the surfaces of the magnetic iron oxide nanoparticles. The biological results showed that breast adenocarcinoma cells (MDA-MB-231) were significantly affected after exposure to the magnetic colloidal suspension with a concentration of 30 µg/mL 24 h post-treatment under hyperthermic conditions, while the nontumorigenic (MCF-10A) cells exhibited a viability above 90% under the same thermal setup. Thus, the biological data obtained in the present study clearly endorse the need for further investigations to establish the clinical biological potential of synthesized magnetic colloidal suspension for magnetically triggered hyperthermia.
Keywords	magnetic iron oxides nanoparticles ; citric acid ; Raman spectroscopy ; combustion method ; breast adenocarcinoma ; Chemistry ; QD1-999
Subject code	620
Language	English
Publishing date	2021-04-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Thermal behavior of MnFe2O4 and MnFe2O4/C nanocomposite synthesized by a solvothermal method

Stoia, Marcela / Eliza Muntean / Cornelia PÄcurariu / Ciprian Mihali

Thermochimica acta. 2017 June 10, v. 652

2017

Abstract: A new solvothermal method for MnFe2O4 nanoparticles and MnFe2O4/C nanocomposite synthesis is reported. Manganese ferrite nanoparticles thus sinthesized are not stable at thermal treatment in oxidizing atmosphere, due to Mn(II) oxidation to Mn(III), ... ...

Abstract	A new solvothermal method for MnFe2O4 nanoparticles and MnFe2O4/C nanocomposite synthesis is reported. Manganese ferrite nanoparticles thus sinthesized are not stable at thermal treatment in oxidizing atmosphere, due to Mn(II) oxidation to Mn(III), evidenced at 640Â°C by thermal analysis. The FTIR spectroscopy also confirmed the oxidation of Mn(II) to Mn(III). XRD analysis has revealed the complete decomposition of manganese ferrite around 700Â°C. The specific surface area of the composite with activated carbon was much higher (253m2gâ1), in comparison with that of the naked ferrite (65m2gâ1). Scanning electron microscopy and transmission electron microscopy images evidenced the obtaining of nearly spherical ferrite nanoparticles, with diameters within the range 10nm â 30nm, loaded on the surface of activated carbon in case of the composite. The magnetization of the synthesized composite (30emugâ1) was below the one of naked manganese ferrite (40emugâ1), but sufficient to insure a facile magnetic separation of the composite from aqueous solution, in case of its use as adsorbent for pollutant removal.
Keywords	Fourier transform infrared spectroscopy ; X-ray diffraction ; activated carbon ; adsorbents ; aqueous solutions ; diameter ; ferrimagnetic materials ; heat treatment ; magnetic separation ; manganese ; nanocomposites ; nanoparticles ; oxidation ; pollutants ; scanning electron microscopy ; surface area ; thermal analysis ; thermal properties ; transmission electron microscopy
Language	English
Dates of publication	2017-0610
Size	p. 1-8.
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	1500974-9
ISSN	0040-6031
ISSN	0040-6031
DOI	10.1016/j.tca.2017.03.009
Database	NAL-Catalogue (AGRICOLA)

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Article: Enhanced Adsorption of p-Nitrophenol from Aqueous Solutions Using a Functionalized Styrene-Divinylbenzene Copolymer

Istratie, Roxana / Roxana BÄbuÅ£Ä / Adriana Popa / Cornelia PÄcurariu / Marcela Stoia

Water, air, and soil pollution. 2017 Aug., v. 228, no. 8

2017

Abstract: The effect of styrene-divinylbenzene copolymer functionalization by carboxylic acid groups on the adsorption of p-nitrophenol (p-NP) from aqueous solutions was investigated. The adsorption capacity of p-NP onto the functionalized copolymer (CP-F) was ... ...

Abstract	The effect of styrene-divinylbenzene copolymer functionalization by carboxylic acid groups on the adsorption of p-nitrophenol (p-NP) from aqueous solutions was investigated. The adsorption capacity of p-NP onto the functionalized copolymer (CP-F) was compared with that of the precursor copolymer, the chloromethylated styrene-divinylbenzene copolymer (CP-N). The two copolymers were characterized by Fourier transform infrared (FTIR) spectroscopy, thermal analysis (DSC-TG), specific surface area and particle size measurements, pore size distribution, scanning electron microscopy (SEM), and elemental analysis (EDX). The adsorption of p-NP was substantially enhanced after the polymer functionalization, and it was demonstrated that hydrogen bonding is principally responsible for the high adsorption capacity of CP-F in comparison with CP-N. The adsorption kinetics of p-NP adsorption onto CP-F was well described by the pseudo-second-order model. From the four investigated isotherms, Langmuir, Freundlich, Redlich-Peterson, and Sips, the equilibrium data were better described by the Sips model. The maximum adsorption capacity of the CP-F polymer resulting from the Sips isotherm was 243.37Â mgÂ gâ»Â¹. The capacity of regeneration and reuse of the CP-F polymer was evaluated in three consecutive cycles of adsorption-desorption.
Keywords	Fourier transform infrared spectroscopy ; adsorption ; aqueous solutions ; composite polymers ; energy-dispersive X-ray analysis ; hydrogen bonding ; models ; p-nitrophenol ; particle size ; porosity ; scanning electron microscopy ; surface area ; thermal analysis
Language	English
Dates of publication	2017-08
Size	p. 276.
Publishing place	Springer International Publishing
Document type	Article
ZDB-ID	120499-3
ISSN	1573-2932 ; 0049-6979 ; 0043-1168
ISSN (online)	1573-2932
ISSN	0049-6979 ; 0043-1168
DOI	10.1007/s11270-017-3463-9
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Fe 3 O 4 @C Matrix with Tailorable Adsorption Capacities for Paracetamol and Acetylsalicylic Acid

Elena-Alina Moacă / Ciprian-Valentin Mihali / Ioana-Gabriela Macaşoi / Roxana Racoviceanu (Băbuţă) / Codruţa Şoica / Cristina-Adriana Dehelean / Cornelia Păcurariu / Sorin Florescu

Molecules, Vol 24, Iss 9, p

Synthesis, Characterization, and Kinetic Modeling

2019 Volume 1727

Abstract: In this study Fe 3 O 4 @C matrix was obtained by combustion method and used hereafter as adsorbent for paracetamol and acetylsalicylic acid removal from aqueous solutions. The Fe 3 O 4 @C matrix was characterized by electronic microscopy, X-ray ... ...

Abstract	In this study Fe 3 O 4 @C matrix was obtained by combustion method and used hereafter as adsorbent for paracetamol and acetylsalicylic acid removal from aqueous solutions. The Fe 3 O 4 @C matrix was characterized by electronic microscopy, X-ray diffraction, thermal analysis, Fourier-transform infrared spectroscopy, and magnetic measurements. Two kinetic models of pseudo first-order and pseudo-second-order for both paracetamol and acetylsalicylic acid were studied. The experimental data were investigated by Langmuir, Freundlich, and Redlich−Peterson adsorption isotherm models. The adsorption followed the Redlich−Peterson and pseudo-second-order models with correlation coefficients R 2 = 0.98593 and R 2 = 0.99996, respectively, for the adsorption of paracetamol; for the acetylsalicylic acid, the adsorption followed the Freundlich and pseudo-second-order model, with correlation coefficients R 2 = 0.99421 and R 2 = 0.99977, respectively. The equilibrium was quickly reached after approximately 1h for the paracetamol adsorption and approximately 2h for acetylsalicylic acid adsorption. According to the Langmuir isotherm, the maximum adsorption capacity of the magnetic matrix was 142.01 mg·g −1 for the retention of paracetamol and 234.01 mg·g −1 for the retention of acetylsalicylic acid. The benefits of using the Fe 3 O 4 @C matrix are the low cost of synthesis and its easy and fast separation from solution by using an NdBFe magnet.
Keywords	Fe 3 O 4 @C matrix ; combustion method ; magnetic properties ; adsorption ; kinetics ; isotherms ; Organic chemistry ; QD241-441
Subject code	333
Language	English
Publishing date	2019-05-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: The influence of combustion synthesis conditions on the α-Al2O3 powder preparation

Ianoş, Robert / Ioan Lazău / Cornelia Păcurariu

Journal of materials science. 2009 Feb., v. 44, no. 4

2009

Abstract: Fuel type and fuel/aluminium nitrate molar ratio proved to be of great importance during the preparation of α-Al₂O₃ powders. A stoichiometric amount of urea (U) enabled the formation of α-Al₂O₃ with a surface area of 24 m²/g directly from the combustion ... ...

Abstract	Fuel type and fuel/aluminium nitrate molar ratio proved to be of great importance during the preparation of α-Al₂O₃ powders. A stoichiometric amount of urea (U) enabled the formation of α-Al₂O₃ with a surface area of 24 m²/g directly from the combustion reaction. Monoethanolamine, triethylenetetramine, trishydroxymethylaminomethane, and triethanolamine yield amorphous powders. This behaviour was explained by the reaction mechanism, which requires the simultaneous decomposition of metal nitrate and fuel, as shown by thermal analysis. The use of 50% of the stoichiometric amount of U was unable to trigger a combustion reaction. The resulting powder was amorphous and had a surface area of 424 m²/g. A parabolic correlation between the surface area of combustion-synthesized powder and the U/aluminium nitrate molar ratio was found. Due to U consumption during the hydrolysis side-reaction, 50% of U excess above the stoichiometric ratio is required in order to maximize the exothermic effect of the combustion reaction. The use of U excess higher than 150% of the stoichiometric ratio not only increases the surface area of the powder, but also changes the phase composition: as the U excess increases the proportion of α-Al₂O₃ decreases and the amount of γ-Al₂O₃ increases.
Keywords	aluminum ; aluminum oxide ; combustion ; ethanolamine ; fuels ; heat production ; hydrolysis ; nitrates ; powders ; reaction mechanisms ; surface area ; thermal analysis ; urea
Language	English
Dates of publication	2009-02
Size	p. 1016-1023.
Publishing place	Springer US
Document type	Article
ZDB-ID	2015305-3
ISSN	1573-4803 ; 0022-2461
ISSN (online)	1573-4803
ISSN	0022-2461
DOI	10.1007/s10853-008-3226-5
Database	NAL-Catalogue (AGRICOLA)

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