Modified hydrothermal reaction (MHT) for CoV2O6·4H2O nanowire formation and the transformation to CoV2O6·2H2O single-crystals for antiferromagnetic ordering and spin-flop

Mondal, Chanchal; Sasmal, Anup Kumar; Yusuf, S. M.; Mukadam, M. D.; Pal, Jayanta; Ganguly, Mainak; Pal, Tarasankar

doi:10.1039/c4ra09976a

Cited by 15 publications

(15 citation statements)

References 35 publications

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“…23−26 The expense and low availability of such metals convinced us to meticulously design a suitable catalyst which is cost effective, earth-abundant, and nontoxic. However, to the best of our knowledge, this is the first report of a tailor-made synthesis of octahedral and hexapod nanostructures of Cu 2 O from the combined effect of EG and glucose under a modified hydrothermal treatment (MHT) 27,28 but from variable pH. Herein, we reveal a high yielding green synthesis of Cu 2 O nanostructures utilizing EG as the stabilizer and glucose as the growth directing agent individually, however both also work cooperatively as the reducing agent in the system at variable pH conditions.…”

Section: Introductionmentioning

confidence: 99%

Remarkable Facet Selective Reduction of 4-Nitrophenol by Morphologically Tailored (111) Faceted Cu₂O Nanocatalyst

et al. 2017

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In this work, we have disclosed the facile syntheses of morphologically diverse Cu 2 O nanoparticles using our laboratory designed modified hydrothermal reactor employing low-cost copper (II) acetate precursor compounds. The reaction conditions dovetail the effect of ethylene glycol (EG) and glucose to exclusively evolve the morphology tuned Cu 2 O nanomaterial at different pHs. The morphology tuning produces octahedron (Oh), dwarf hexapod (DHP), and elongated hexapod (EHP) Cu 2 O structures only with the optimized reagent concentrations. Interestingly, all of them were bestowed with a (111) facet, a superlative facet for facile nitroarene reduction. Thus, the morphology reliant catalytic reaction becomes evident. However, when used individually, EG and glucose evolve ill-defined CuO/Cu 2 O and Cu 2 O structures, respectively. We have observed that a change in pH of the medium at the onset of the reaction is obligatory for the evolution of tailor-made morphologically diverse Cu 2 O nanoparticles. However, preformed Cu 2 O particles do not suffer further structure/morphology changes under deliberate pH (6.0–9.0) change. With the as-obtained Oh, DHP, and EHP Cu 2 O structures, we further delve into the realm of catalysis to understand the splendor of the nanocatalyst, morphology and surface area dependence, facet selective reactivity, and other factors affecting the catalytic efficiency. The remarkable rate of catalysis of 4-nitrophenol (4-NP), evident from the catalyst activity parameter ( k a = 123.6 g –1 s –1 ), to produce 4-aminophenol in the presence of a reducing agent like sodium borohydride (NaBH 4 ) of the as-prepared catalysts is evidence of the collaborative effects of the effective surface area, surface positive charge, and active (111) facet of the Cu 2 O nanocatalyst. We have also studied the effect of other common anions, namely, Cl – , NO 2 – , NO 3 – , CO 3 2– , and SO 4 2– on the reduction process. To obtain a general consensus about facets, we compared (100) and (111) faceted Cu 2 O nanocatalysts not only for 4-NP reduction but also for the reduction of toxic chromium Cr(VI) in the presence of formic acid to further emphasize the importance of facet selectivity in catalysis and the versatility of the morphology tuned as-prepared Cu 2 O.

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Section: Introductionmentioning

confidence: 99%

Remarkable Facet Selective Reduction of 4-Nitrophenol by Morphologically Tailored (111) Faceted Cu₂O Nanocatalyst

et al. 2017

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“…There are numerous classes of cobalt vanadates such as Co 3 V 2 O 8 [16,17], Co 2 V 2 O 7 [18,19] and CoV 2 O 6 [20,21]. Many inquiries have been carried out on the synthesis routes of cobalt vanadates including precipitation [22], solid-state [23], sol-gel [24], hydrothermal [25,26] and electrospinning [27].…”

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Size controllable synthesis of cobalt vanadate nanostructures with enhanced photocatalytic activity for the degradation of organic dyes

Ghiyasiyan-Arani

Masjedi-Arani

Salavati‐Niasari

2016

Journal of Molecular Catalysis A: Chemical

104

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Different types of cobalt vanadate nanostructures such as Co 3 V 2 O 8 , Co 2 V 2 O 7 and CoV 2 O 6 have been successfully prepared via a simple solid-state method. For the first time, cobalt vanadate nanostructures were synthesized via Schiff-base ligand and vanadyl sulfate as a capping agent and vanadium source, respectively. The effect of a Schiff-base ligand (N,N-Bis (salicylaldehyde) ethylenediamine = H 2 salen) as a capping agent, molar ratio of Co: H 2 salen and Co:V on type of products, morphology and size of cobalt vanadate nanoparticles was investigated to reach optimum condition. The as-prepared nanostructures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmittance electron microscopy (TEM), Fourier transform infrared (FT-IR) spectra, energy dispersive X-ray microanalysis (EDX) and ultraviolet-visible (UV-Vis) spectroscopy. This work is the first study on photocatalytic activity of cobalt vanadate nanostructures in different conditions. The influence of different parameters such as type of cobalt vanadate nanostructures, type of dye, size of particles and nanostructures dosage as a catalyst on photocatalytic activity of samples were studied.

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“…Due to its magnetic behavior for easy recycle and high potential performances, Fe 2 V 4 O 13 is expected to be a superior material for the removal of hazardous heavy metal ions into the aquatic environment. Very few efforts have been made to examine lithium-ion batteries, Fenton-like catalyst, photocatalytic reduction CO 2 and degradation gaseous isopropyl alcohol applications of Fe 2 V 4 O 13 nanomaterials [13][14][15][16]. The photocatalytic activity strongly depends on the crystalline nature, specific surface area and surface morphology [17].…”

Section: Introductionmentioning

confidence: 99%

Design and Fabrication of Novel Sheet-like Iron Vanadate Photocatalyst for the Photoreduction of Chromium

2019

IJITEE

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In past days, the occurrence of toxic heavy metal ions into the water and soil environment causes major health risk to the living organisms. In this work, we mainly focused on the photoreduction of hexavalent chromium (Cr6+) using novel sheet-like Fe2V4O13 photocatalyst under visible light irradiation. The sheet-like Fe2V4O13 was tailored through hydrothermal process using ferric chloride and sodium metavanadate precursors without addition of any templates. The surface morphology, elemental analysis and various physical properties are characterized by numerous spectroscopic techniques. Interestingly, the sheet-like Fe2V4O13 demonstrated proficient photocatalytic performances towards the reduction of Cr6+ into Cr3+. The obtained UV-visible spectroscopy results portrayed that sheet-like Fe2V4O13 could reduce above of Cr6+ solution within 40 min. Moreover, the sheet-like Fe2V4O13 holds very good stability even after five consecutive cycles. This study could open new insights for the design novel nanostructured binary metal oxides for environmental applications.

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Modified hydrothermal reaction (MHT) for CoV₂O₆·4H₂O nanowire formation and the transformation to CoV₂O₆·2H₂O single-crystals for antiferromagnetic ordering and spin-flop

Cited by 15 publications

References 35 publications

Remarkable Facet Selective Reduction of 4-Nitrophenol by Morphologically Tailored (111) Faceted Cu₂O Nanocatalyst

Remarkable Facet Selective Reduction of 4-Nitrophenol by Morphologically Tailored (111) Faceted Cu₂O Nanocatalyst

Size controllable synthesis of cobalt vanadate nanostructures with enhanced photocatalytic activity for the degradation of organic dyes

Design and Fabrication of Novel Sheet-like Iron Vanadate Photocatalyst for the Photoreduction of Chromium

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Modified hydrothermal reaction (MHT) for CoV2O6·4H2O nanowire formation and the transformation to CoV2O6·2H2O single-crystals for antiferromagnetic ordering and spin-flop

Cited by 15 publications

References 35 publications

Remarkable Facet Selective Reduction of 4-Nitrophenol by Morphologically Tailored (111) Faceted Cu2O Nanocatalyst

Remarkable Facet Selective Reduction of 4-Nitrophenol by Morphologically Tailored (111) Faceted Cu2O Nanocatalyst

Size controllable synthesis of cobalt vanadate nanostructures with enhanced photocatalytic activity for the degradation of organic dyes

Design and Fabrication of Novel Sheet-like Iron Vanadate Photocatalyst for the Photoreduction of Chromium

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Modified hydrothermal reaction (MHT) for CoV₂O₆·4H₂O nanowire formation and the transformation to CoV₂O₆·2H₂O single-crystals for antiferromagnetic ordering and spin-flop

Remarkable Facet Selective Reduction of 4-Nitrophenol by Morphologically Tailored (111) Faceted Cu₂O Nanocatalyst

Remarkable Facet Selective Reduction of 4-Nitrophenol by Morphologically Tailored (111) Faceted Cu₂O Nanocatalyst