Effect of the Surfactant on the Growth and Oxidation of Iron Nanoparticles

Ruíz-Baltazar, Álvaro de Jesús; Esparza, Rodrigo; Rosas, G.; Pérez, R.

doi:10.1155/2015/240948

Cited by 110 publications

(61 citation statements)

References 28 publications

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“…Moreover, the SEM images of MB materials pyrolyzed at diferent temperatures were shown in figure S5. Figure 4(a) [34,35]. In figure 4(b), all these peaks appear again in the XRD spectrum of MB500 and some peaks of the MB500 shifted such as 30.05 o , 43.48 o , and 56.50 o .…”

Section: Characterization Of Biocharmentioning

confidence: 82%

“…In figure 4(b), all these peaks appear again in the XRD spectrum of MB500 and some peaks of the MB500 shifted such as 30.05 o , 43.48 o , and 56.50 o . The major peak at 35.83 of MB500 is correlated with the peak at 35.05 o of standard which is for a crystalline plane with Miller indices of (311) [9,35]. Therefore, the iron oxide precipitation by thermal process, Fe 3 O 4 is formed.…”

Section: Characterization Of Biocharmentioning

confidence: 92%

“…The first Fe(OH) 3 and then Fe(OH) 2 were precipitated onto the biochar surface and the Fe(OH) 2 can be oxidized to Fe(OH) 3 by dissolved oxygen as well. These processes lead to the formation of mixed iron oxide/hydroxide (FeOOH) and magnetite (Fe 3 O 4 ) during the pyrolysis condition [9,[34][35][36]. Furthermore, the broad band at ∼20°-30°indicates that the majority of biochar remains as amorphous in the MB nanocomposite materials.…”

Section: Characterization Of Biocharmentioning

confidence: 99%

See 2 more Smart Citations

Enhancement the rhodamine 6G adsorption property on Fe₃O₄-composited biochar derived from rice husk

Suwunwong

Patho

Choto

et al. 2020

Mater. Res. Express

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Magnetic biochars were prepared using Fe 3 O 4 nanoparticle composites onto the surface of biochar derived from rice husk. The characteristics of magnetic biochar were characterized by scanning electron microscope, x-ray powder diffraction and Fourier-transform infrared techniques. The removal of rhodamine 6G dye by magnetic biochar, compared to pristine biochar was studied. The effects of pyrolysis temperature on rhodamine 6G adsorption was evaluated. Kinetic, isotherms and thermodynamic studies were carried out to investigate the adsorption mechanism of rhodamine 6G dye on magnetic biochar surface. The rhodamine 6G removal efficiency of Fe 3 O 4 -composited biochar (pyrolyzed at 500°C) is higher than that of pristine biochar with maximum efficiency of 94% removal. The adsorption isotherm and kinetic studies indicated that the langmuir model, pseudo-first order and pseudo-second order models described well the rhodamine adsorption onto magnetic Fe 3 O 4 -biochar. Abbreviations BCBiochar C 0 Initial dye concentration (mg/L) C e Equilibrium concentration of dye (mg/L) ΔG 0 The Gibbs free energy) and f ΔH 0 The change of enthalpy MB Magnetic biochar q e Adsorbed dye amount per gram of sorbent at equilibrium (mg/g) q e,cal Calculated amount of dye adsorbed per gram of adsorbent at equilibrium (mg/g) q e,exp Experimental amount of dye adsorbed per gram of adsorbent at equilibrium (mg/g) q t Adsorbed dye amount per gram of adsorbent at time t (mg/g) K Thermodynamic equilibrium constant K L Langmuir isotherm equilibrium constant representing the energy of sorption (L/mg) K F Freundlich constant representing sorption capacity ((mg/g)(L/mg)/n) k 1 Pseudo-first order rate constant (1/min) k 2 Pseudo-second order rate constant (g/mg·min) n Freundlich isotherm constant representing sorption intensity R The ideal gas constant (8.314 J mol −1 ·K −1 )

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Section: Characterization Of Biocharmentioning

confidence: 82%

Section: Characterization Of Biocharmentioning

confidence: 92%

Section: Characterization Of Biocharmentioning

confidence: 99%

See 1 more Smart Citation

Enhancement the rhodamine 6G adsorption property on Fe₃O₄-composited biochar derived from rice husk

Suwunwong

Patho

Choto

et al. 2020

Mater. Res. Express

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“…IR spectra of the synthesized PVA-Fe3O4 and PVA-GA-Fe3O4 nanoparticles showed -OH (3394 -3386 cm , as similar result was also reported by Ruíz-Baltazar. 27 This information indicated that the hydroxyl groups were successfully replaced by PVA and PVA-GA, so the oxidation of Fe3O4 could be prevented. XRD patterns proved the existence of magnetite (Fe3O4) and maghemite (γ-Fe2O3) phases in all prepared materials while PVA phases could be identified in PVA-Fe3O4 and PVA-GA-Fe3O4 materials as shown in Fig.-3.…”

Section: Ftir and Xrd Patterns Of Pva-coated Fe3o4 Nanoparticlesmentioning

confidence: 96%

DESIGNED STRUCTURE AND MAGNETIC CHARACTERISTIC STUDIES OF MAGNETIC IRON OXIDE (Fe3O4) NANOPARTICLES COATED BY POLYVINYL ALCOHOL AND POLYVINYL ALCOHOL-LINKED WITH GLUTARALDEHYDE

2017

RJC

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In this work, polyvinyl alcohol (PVA)-coated Fe3O4 (PVA-Fe3O4) and PVA-grafted Fe3O4 using glutaraldehyde (GA) as a crosslinker (PVA-GA-Fe3O4) were prepared. These two materials were prepared by in-situ coprecipitation method due to the simplicity synthesis procedures which accompanied with mild and clean conditions to produce excellent materials. The effects of preparation and synthesis conditions toward the characteristics of PVA-Fe3O4, and PVA-GA-Fe3O4 nanoparticles were investigated in detail. Then, the resulted nanoparticles of PVA-Fe3O4 and PVA-GA-Fe3O4 were characterized by Fourier transform infrared spectroscopy (FTIR), electron spin resonance (ESR) spectroscopy, and X-ray diffraction (XRD). The result showed that PVA with and without crosslinker was successfully coated onto the surface of Fe3O4 nanoparticles. Increasing PVA concentration triggered a decline in the abundance of Fe3O4 phase, its lattice parameter and magnetism. However, once GA as crosslinker was added to the system, the amount of Fe3O4 phase, its lattice parameter and magnetism raised whereas its crystallite size decreased. The influence of each crystallographic parameter on their magnetism was discussed systematically in detail.

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“…The reaction mixture changed from light yellow to colorless. The catalytic reaction using Au@PNIPAm/PEI (amine to gold molar ratio of 28:1) and Ag@Au/PNIPAm/PEI [amine to gold and silver ions ratio (N/Au 3+ Ag + ) of 28:1] were systematically studied under different solution pH values (3)(4)(5)(6)(7)(8)(9)(10)(11) and temperatures (25-39˝C). The reduction of p-nitrophenol to p-aminophenol was monitored by the UV-visible spectroscopy (Agilent Technologies, Santa Clara, CA, USA) at a wavelength of 400 nm for 20 min.…”

Section: Catalytic Activity Of Nanocomposite Particlesmentioning

confidence: 99%

Green Synthesis of Smart Metal/Polymer Nanocomposite Particles and Their Tuneable Catalytic Activities

Tan

Lee

2016

Polymers

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Herein we report a simple and green synthesis of smart Au and Ag@Au nanocomposite particles using poly(N-isopropylacrylamide)/polyethyleneimine (PNIPAm/PEI) core-shell microgels as dual reductant and templates in an aqueous system. The nanocomposite particles were synthesized through a spontaneous reduction of tetrachloroauric (III) acid to gold nanoparticles at room temperature, and in situ encapsulation and stabilization of the resultant gold nanoparticles (AuNPs) with amine-rich PEI shells. The preformed gold nanoparticles then acted as seed nanoparticles for further generation of Ag@Au bimetallic nanoparticles within the microgel templates at 60˝C. These nanocomposite particles were characterized by TEM, AFM, XPS, UV-vis spectroscopy, zeta-potential, and particle size analysis. The synergistic effects of the smart nanocomposite particles were studied via the reduction of p-nitrophenol to p-aminophenol. The catalytic performance of the bimetallic Ag@Au nanocomposite particles was 25-fold higher than that of the monometallic Au nanoparticles. Finally, the controllable catalytic activities of the Au@PNIPAm/PEI nanocomposite particles were demonstrated via tuning the solution pH and temperature.

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Effect of the Surfactant on the Growth and Oxidation of Iron Nanoparticles

Cited by 110 publications

References 28 publications

Enhancement the rhodamine 6G adsorption property on Fe₃O₄-composited biochar derived from rice husk

Enhancement the rhodamine 6G adsorption property on Fe₃O₄-composited biochar derived from rice husk

DESIGNED STRUCTURE AND MAGNETIC CHARACTERISTIC STUDIES OF MAGNETIC IRON OXIDE (Fe3O4) NANOPARTICLES COATED BY POLYVINYL ALCOHOL AND POLYVINYL ALCOHOL-LINKED WITH GLUTARALDEHYDE

Green Synthesis of Smart Metal/Polymer Nanocomposite Particles and Their Tuneable Catalytic Activities

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Effect of the Surfactant on the Growth and Oxidation of Iron Nanoparticles

Cited by 110 publications

References 28 publications

Enhancement the rhodamine 6G adsorption property on Fe3O4-composited biochar derived from rice husk

Enhancement the rhodamine 6G adsorption property on Fe3O4-composited biochar derived from rice husk

DESIGNED STRUCTURE AND MAGNETIC CHARACTERISTIC STUDIES OF MAGNETIC IRON OXIDE (Fe3O4) NANOPARTICLES COATED BY POLYVINYL ALCOHOL AND POLYVINYL ALCOHOL-LINKED WITH GLUTARALDEHYDE

Green Synthesis of Smart Metal/Polymer Nanocomposite Particles and Their Tuneable Catalytic Activities

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Enhancement the rhodamine 6G adsorption property on Fe₃O₄-composited biochar derived from rice husk

Enhancement the rhodamine 6G adsorption property on Fe₃O₄-composited biochar derived from rice husk