Beading of cobalt substituted nickel ferrite nanoparticles on the surface of carbon nanotubes: a study of their synthesis mechanism, structure, magnetic, optical and their application as photocatalyst.

Singh, Charanjit; Bansal, Sandeep; Kumar, Vinod; Singhal, Sonal

doi:10.1016/j.ceramint.2014.11.021

Cited by 29 publications

(4 citation statements)

References 24 publications

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“…But, magnetic NPs were found to be inactive in the visible region until the generation of Fenton's reagent as previously reported. 10,11 So, in order to play on these magnetic materials in the visible light spectrum, such magnetite nanomaterials have been encrusted over visible solar spectrum sensitive luminescent moieties.…”

Section: Introductionmentioning

confidence: 99%

CdS nanorod–MFe₂O₄ (M = Zn, Co and Ni) nanocomposites: a heterojunction synthesis strategy to mitigate environmental deterioration

et al. 2015

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A facile strategy to encrust MFe 2 O 4 (M = Zn, Co and Ni) nanoparticles over CdS nanorods via two-step solvothermal method have been reported. The ferrite-CdS nanocomposites (NCs) were characterized using powder X-ray Diffraction (XRD) andFourier Transform Infrared (FT-IR) spectroscopy. A shifting in the peak corresponding to (311) plane confirmed the presence of different metal ion in the spinel ferrite lattice.However, no variation in the peak of CdS was observed which stipulate that phase and morphology of CdS nanorods remain unaltered after hydrothermal treatment. High Resolution Transmission Electron Microscopy (HR-TEM) analysis revealed the efficacious attachment of the nanoferrite on the CdS nanorods. Optical studies of the NCs samples provided the information about the fabrication of visible light responsive photocatalyst and covered the solar spectrum from 525 nm to 737 nm. On the basis of magnetic studies, CdS-CoFe 2 O 4 and CdS-NiFe 2 O 4 were found to be ferromagnetic in nature with saturation magnetization of 26.4 and 15.5 emu/g respectively. Interestingly, a transition from ferromagnetic to super-paramagnetic was observed for ZnFe 2 O 4 loaded CdS nanorods. The photo-catalytic activities of nanocomposites were studied by carrying out the photodegradation of rhodamine B and methylene blue dye under visible-light irradiation. Maximum activity was observed in case of CdS-ZnFe 2 O 4 nanocomposites. This behavior of saturation magnetization for CoFe 2 O 4 -CdS NCs is due to the strengthening of A-B interactions as the cobalt ion has a tendency to occupy octahedral B site. So, some of the Fe 3+ ions get transferred to the tetrahedral site and the magnetic moment of M B gets concerted. So, the saturation magnetization for the CoFe 2 O 4 -CdS NRs increased. However with the Zn 2+ ions substituent, A-B exchange interactions weaken as Zn 2+ ions have the tendency to occupy the tetrahedral A sites. So the magnetic moment of M A gets diluted. 29 Therefore, for ZnFe 2 O 4 -CdS NCs, the curve didn't get saturated, indicating the fabrication of super-paramagnetic nanocomposites with negligible coercivity and remanance. However NiFe 2 O 4 -CdS NCs displayed ferromagnetic behavior. This superparamagnetic behavior of ZnFe 2 O 4 -CdS NCs can be attributed to lower particle size and the presence of non-magnetic ions in the spinel ferrite structure, which would have led to single domains. 29 These results are corroborated by the presence of single domain structure in HR-TEM images (Fig. 3) A huge difference in magnetic parameters is also conspicuous from the hysteresis loops of the NCs. It is evident from the figure that the saturation magnetization value for the CdS-ZnFe 2 O 4 NCs is 4.0 emu/g. However for CdS-CoFe 2 O 4 NCs and CdS-NiFe 2 O 4 NCs saturation magnetization is 26.4 and 15.5 emu/g respectively. Similarly, a vast variation in the values of remanance and coercivity was observed. The coercivity for CdS-ZnFe 2 O 4 NCs was 8.5 Oe, which upsurged to 90 Oe and 377.2 Oe for CdS-NiFe 2 O 4 NCs and CdS-CoFe 2 O 4N...

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Section: Introductionmentioning

confidence: 99%

CdS nanorod–MFe₂O₄ (M = Zn, Co and Ni) nanocomposites: a heterojunction synthesis strategy to mitigate environmental deterioration

et al. 2015

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“…Similar shi in the 2q values with the substitution of smaller sized Mg 2+ ions in to the cobalt ferrite lattice was observed by Bhukal et al 34 Crystallite size was calculated from the line broadening of the most intense (3 1 1) peak using the classical Scherrer equation. 35,36 The crystallite sizes for all the ferrite nanoparticles were found to be in the range of 14-18 nm. The lattice parameter values were evaluated using the Le bail renement method.…”

Section: Powder X-ray Diffraction (Xrd) Studiesmentioning

confidence: 95%

Facile protocol for reduction of nitroarenes using magnetically recoverable CoM_0.2Fe_1.8O₄ (M = Co, Ni, Cu and Zn) ferrite nanocatalysts

et al. 2015

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GRAPHICAL ABSTRACT:Cu ions occupy the catalytically active octahedral sites of the ferrite sub-lattice and present a synergistic effect due to the formation of Cu-Co and Cu-Fe ion pairs which triggers up the catalytic performance of CoCu 0.2 Fe 1.8 O 4 ferrite nanoparticles for the reduction of nitroarenes. AbstractTransition metal doped cobalt ferrite (CoM 0.2 Fe 1.8 O 4 (M= Co, Ni, Cu, Zn)) nanoparticles were fabricated using the sol-gel methodology. The obtained ferrite nanoparticles were annealed at 400 °C and characterized using Fourier transform infra-red spectroscopy (FT-IR), X-ray diffraction (XRD), High resolution transmission electron microscopy (HR-TEM), Vibrating sample magnetometer (VSM) and Energy dispersive X-ray (EDX) and Scanning transmission electron microscopy (STEM). In the FT-IR spectra two bands in the range 1000-400 cm -1 were observed corresponding to the M-O bond in the tetrahedral and octahedral sites. XRD patterns confirmed the formation of cubic spinel structure with Fd-3m space-group. HR-TEM analysis revealed the quasi-spherical shape with particle size in the range 20-30 nm for all the synthesized ferrite nanoparticles. The lattice inter-planar distance of 0.29, 0.25, 0.21 and 0.16 nm obtained from HR-TEM corresponding to (2 2 0), (3 1 1), (4 0 0) and (5 1 1) lattice planes respectively were in complete agreement with the XRD data. The EDX-STEM confirmed the elemental composition as per the desired stoichiometric ratio. The catalytic efficiency of the synthesized ferrite samples was explored for the reduction of nitrophenols. Cu substituted cobalt ferrite nanoparticles (CoCu 0.2 Fe 1.8 O 4 ) possessed excellent catalytic activity while CoM 0.2 Fe 1.8 O 4 (M= Co, Ni and Zn) were inactive for the same. Substrate scope of the developed protocol was also evaluated for the reduction of various CH 3 -, NH 2 -, Br-, Cl etc. substituted nitroaromatic compounds. Research highlights:• CoM 0.2 Fe 1.8 O 4 (M= Co, Ni, Cu, Zn) fabricated by sol-gel methodology.• Comparative catalytic efficiency of transition metal doped cobalt ferrites.• CoCu 0.2 Fe 1.8 O 4 as excellent catalysts for the reduction of nitroarenes.• Facile protocol for the synthesis of aromatic amines Keywords:Catalytic reduction Nitroarenes Magnetically recoverable nanoferrites Catalytically active octahedral sites Synergistic effect

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“…Advanced oxidation processes (AOPs) have emerged as promising alternative processes for wastewater treatment, especially for persistent and nonbiodegradable contaminants, such as dyeing wastewater [4][5][6]. As one of the most important AOPs, photo-Fenton degradation of organic dyes using hydrogen peroxide (H2O2)/visible light has been widely studied [7][8][9]. In this process, the photodegradation efficiency depends on the decomposition rate of H2O2.…”

Section: Introductionmentioning

confidence: 99%

Preparation of a fullerene[60]-iron oxide complex for the photo-fenton degradation of organic contaminants under visible-light irradiation

Zou

Meng

et al. 2018

Chinese Journal of Catalysis

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Beading of cobalt substituted nickel ferrite nanoparticles on the surface of carbon nanotubes: a study of their synthesis mechanism, structure, magnetic, optical and their application as photocatalyst.

Cited by 29 publications

References 24 publications

CdS nanorod–MFe₂O₄ (M = Zn, Co and Ni) nanocomposites: a heterojunction synthesis strategy to mitigate environmental deterioration

CdS nanorod–MFe₂O₄ (M = Zn, Co and Ni) nanocomposites: a heterojunction synthesis strategy to mitigate environmental deterioration

Facile protocol for reduction of nitroarenes using magnetically recoverable CoM_0.2Fe_1.8O₄ (M = Co, Ni, Cu and Zn) ferrite nanocatalysts

Preparation of a fullerene[60]-iron oxide complex for the photo-fenton degradation of organic contaminants under visible-light irradiation

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Beading of cobalt substituted nickel ferrite nanoparticles on the surface of carbon nanotubes: a study of their synthesis mechanism, structure, magnetic, optical and their application as photocatalyst.

Cited by 29 publications

References 24 publications

CdS nanorod–MFe2O4 (M = Zn, Co and Ni) nanocomposites: a heterojunction synthesis strategy to mitigate environmental deterioration

CdS nanorod–MFe2O4 (M = Zn, Co and Ni) nanocomposites: a heterojunction synthesis strategy to mitigate environmental deterioration

Facile protocol for reduction of nitroarenes using magnetically recoverable CoM0.2Fe1.8O4 (M = Co, Ni, Cu and Zn) ferrite nanocatalysts

Preparation of a fullerene[60]-iron oxide complex for the photo-fenton degradation of organic contaminants under visible-light irradiation

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CdS nanorod–MFe₂O₄ (M = Zn, Co and Ni) nanocomposites: a heterojunction synthesis strategy to mitigate environmental deterioration

CdS nanorod–MFe₂O₄ (M = Zn, Co and Ni) nanocomposites: a heterojunction synthesis strategy to mitigate environmental deterioration

Facile protocol for reduction of nitroarenes using magnetically recoverable CoM_0.2Fe_1.8O₄ (M = Co, Ni, Cu and Zn) ferrite nanocatalysts