Preparation and characterization of manganese, nickel and cobalt ferrites submicron particles in sulfonated crosslinked networks

Maria, Luiz C. Santa; Costa, Marcos Heil; Soares, J.G.M.; Wang, S.H.; Silva, M.R.

doi:10.1016/j.polymer.2005.09.055

Cited by 15 publications

(14 citation statements)

References 15 publications

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“…The Sty-DVB copolymers were synthesized by aqueous suspension polymerization, as described previously [10][11][12][13][14] . The aqueous phase was constituted of 450 cm 3 of water, NaCl (18.0 g), gelatin (0.9 g) and 2-hydroxiethylcellulose (0.4 g).…”

Section: Preparation Of Sty-dvb Copolymersmentioning

confidence: 99%

“…The suspension system was warmed at 70 °C for 24h to produce nickel and cobalt particles. Finally, the beads were thoroughly washed with deionized water (3 portions of 250 cm 3 ) and acetone (250 cm 3 ) and dried at 60 °C by 48 h [10][11][12] .…”

Section: Sulfonation Of the Sty-dvb Copolymersmentioning

confidence: 99%

“…The Sty-DVB copolymers were characterized by determining the apparent density [10][11][12] , swelling degree in 1,2-dichloroethane [10][11][12] , surface area and pore volume distribution by nitrogen adsorption followed the BET and BJH methods, respectively (Micromeritcs ASAP 2020 apparatus), and by scanning electron microscopy (Philips XL-30, 20 keV, gold coating).…”

Section: Characterization Of the Polymersmentioning

confidence: 99%

“…The ion exchange capacity of the sulfonic resins was determined by acid-base titration [16] . Magnetization curves of the composites were plotted from the data obtained from an AGGPAR 4500 vibrating sample magnetometer (VSM), calibrated against a cylindrical nickel standard at room temperature (cycle time = 1 s) and hysteresis cycle time of 10 min [10][11][12] .…”

Section: Characterization Of the Polymersmentioning

confidence: 99%

“…Polymeric resins based on divinylbenzene copolymers such as poly (N-vinylpyrrolidonedivinylbenzene, poly (styrene-divinylbenzene) modified with amine, hypercrosslinked polymeric resin (MN200), Amberlite XAD-4, crosslinked poly-4-vinylpyridine and poly(methylmethacrylate-divinylbenzene) have been evaluated for removing phenolic compounds from wastewater [2,[5][6][7][8][9] . Although magnetic composite materials have a wide range of potential technological applications, such as water treatment, cell labeling, cell separation, enzyme immunoassaying and drug targeting, the evaluation of this type of material for extraction of phenolic compounds has not been sufficiently studied [10][11][12][13][14] . In our last work, we verified that it is possible to prepare micrometer-sized magnetic particles (NiFe 2 O 4 , CuFe 2 O 4 , CoFe 2 O 4 and MnFe 2 O 4 ), hosted on commercial Sty-DVB copolymers [10] .…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Removal of Phenol from Aqueous Solutions by Polymeric Composites Containing Ni and Co Particles

Simplício¹,

Maria²,

Costa³

et al. 2013

Polímeros

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Abstract:Magnetic composites have a wide range of potential technological applications; however the evaluation of this material for extraction of phenolic compounds has not been sufficiently studied. Due to its high toxicity and solubility the removal of phenolic compounds from the aquatic environments has critical importance. In this work polymeric composites were prepared by anchoring Ni and Co particles on sulfonatedpoly(styrene-co-divinylbenzene) PS-DVB. The PS-DVB beads were synthesized by suspension polymerization and reacted with acetyl sulfate, aiming to obtain sulfonated copolymers. All materials were capable of removing phenol from aqueous solutions. The phenol adsorption kinetics was influenced by the polymer porosity and swelling capacity in water. The composite derivative of the more porous copolymer impregnated with nickel (C1SNi) was the most efficient in phenol removal, with the sorption equilibrium being established more rapidly than for the other composites. The pseudo second-order model was more adequate to describe the phenol adsorption process for the composite C1SNi. The Langmuir model describes successfully the phenol removal by this composite.

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Section: Preparation Of Sty-dvb Copolymersmentioning

confidence: 99%

Section: Sulfonation Of the Sty-dvb Copolymersmentioning

confidence: 99%

Section: Characterization Of the Polymersmentioning

confidence: 99%

Section: Characterization Of the Polymersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Removal of Phenol from Aqueous Solutions by Polymeric Composites Containing Ni and Co Particles

Simplício¹,

Maria²,

Costa³

et al. 2013

Polímeros

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Synthesis, characterization, and bactericidal properties of composites based on crosslinked resins containing silver

Maria

Souza

Aguiar

et al. 2007

J of Applied Polymer Sci

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Two different commercial crosslinked resins (Amberlite GT73 and Amberlite IRC748) were employed for anchoring silver. The À ÀSH and À ÀN(CH 2 COOH) 2 groups, respectively, present on these resins were used for Ag 1 chelation from an aqueous solution. The Ag 1 ions were reduced with three different reductants: hydrazine, hydroxylamine, and formaldehyde (under an alkaline pH). The produced composites were characterized with thermogravimetry/differential thermogravimetry and scanning electron microscopy combined with a backscattered scanning electron detector. Energy-dispersive X-ray spectroscopy coupled to scanning electron microscopy allowed the observation of submicrometer particles of silver, and chemical microanalysis of emitted X-rays revealed the presence of metal on the internal and external surfaces of the composite microspheres. The amount of incorporated silver was determined by titration. The antibacterial activity of the silver/ resin composites was determined toward 10 3 -10 7 cells/mL dilutions of the auxotrophic AB1157 Escherichia coli strain; the networks containing anchored submicrometer silver particles were completely bactericidal within a few minutes because of the combined action of silver and functional groups of the resins.

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Influence of Benzoyl Peroxide and Divinylbenzene Concentrations on the Properties of Poly(glycidyl methacrylate‐co‐divinylbenzene) Magnetic Microspheres

Formiga

Silva

Cunha

et al. 2023

Macro Reaction Engineering

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In this work, the synthesis of magnetic microspheres of poly(glycidyl methacrylate‐co‐divinylbenzene) via suspension polymerization is reported. The concentrations of divinylbenzeneand benzoyl peroxide in the microspheres synthesis are studied. The microspheres, characterized by thermal analysis , scanning electron microscopy, vibrating sample magnetometry , and light scattering detection , show good morphological control and thermal stability. This material presents a narrow size range and an appreciable fraction of superparamagnetic particles. The increase in divinylbenzene concentration can cause a decrease in the mean diameter of the microspheres. On the other hand, the increase in benzoyl peroxide concentration causes an increase in the mean diameter of the microspheres.

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Preparation and characterization of manganese, nickel and cobalt ferrites submicron particles in sulfonated crosslinked networks

Cited by 15 publications

References 15 publications

Removal of Phenol from Aqueous Solutions by Polymeric Composites Containing Ni and Co Particles

Removal of Phenol from Aqueous Solutions by Polymeric Composites Containing Ni and Co Particles

Synthesis, characterization, and bactericidal properties of composites based on crosslinked resins containing silver

Influence of Benzoyl Peroxide and Divinylbenzene Concentrations on the Properties of Poly(glycidyl methacrylate‐co‐divinylbenzene) Magnetic Microspheres

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