Solvothermal synthesis of CuO–MgO nanocomposite particles and their catalytic applications

Alla, S.K.; Verma, Alkadevi; Kumar, Vinod; Mandal, R.K.; Sinha, Indrajit; Prasad, N.K.

doi:10.1039/c6ra03762c

Cited by 67 publications

(24 citation statements)

References 34 publications

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“…A number of reasons have been attributed for the observation of induction times . For many catalysts, such induction times are believed due to dissolved/adsorbed oxygen present in water, reacting faster with the electron donor than that with the key reactant . In the current case, possibly, oxygen dissolved in water adsorbs on the catalyst surface, and the reaction of this adsorbed oxygen with thiosulphate instead of ferricyanide results in the observed induction time (see Figure S10 in the Supporting Information for catalysis experiments performed in a nitrogen purged environment that significantly reduced the induction time).…”

Section: Resultsmentioning

confidence: 86%

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Role of Water in the Dynamic Crystallization of CuTCNQ for Enhanced Redox Catalysis (TCNQ = Tetracyanoquinodimethane)

Siu

Anderson

Mohammadtaheri

et al. 2017

Adv Materials Inter

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have established a breadth of TCNQ-based charge-transfer complexes, each with unique properties. While growing recognition of TCNQ-based materials has led to a number of fabrication strategies including electrochemical, vapor deposition, and wet chemical routes; the applicability of these materials has until recently been severely restricted to electronics. [21][22][23][24][25][26] A unique subset of this group of materials is MTCNQ ionic charge transfer complexes, wherein M corresponds to a transition metal cation (CuTCNQ and AgTCNQ are the most extensively studied) and TCNQ is an anion. [1][2][3][4][5][6][7][8] The presence of transition metal in these metal-organic charge transfer complexes offers a unique opportunity to combine their inherent organic semiconducting properties with the well-established applications of metals in catalysis, sensing, and biology. In recent years, our group and others have shown the potential of these materials beyond electronics, such that CuTCNQ and its metal composites were found as outstanding catalysts for electron transfer and dye degradation reactions; [1][2][3]5] CuTCNQ/ZnO heterojunctions as a humidity sensor; [27] CuTCNQ nanoarrays as pressure sensors; [28] KTCNQ, NaTCNQ, and LiTCNQ as highly specific NO x /H 2 gas sensors; [29,30] and AgTCNQ as antimicrobial agents. [31] These emerging applications of MTCNQ materials now warrant new developments in the current fabrication strategies such that obtained materials are best suited for the targeted application.For CuTCNQ, the current wet chemical fabrication strategy employs a Cu foil (Cu 0 ) as a source of metal, which is immersed in a TCNQ 0 solution dissolved in acetonitrile (MeCN). [1][2][3]32] A spontaneous redox reaction leads to crystallization of phase I CuTCNQ [i.e., Cu + TCNQ − ] microrods vertically aligned on the surface of the Cu foil. [21] A limitation of this approach is that the length of the CuTCNQ microrods is typically restricted to ≈10-15 µm. This is primarily because the as-synthesized CuTCNQ concomitantly dissolves into Cu + and TCNQ − ions on prolonged exposure to MeCN. [32] The concurrent dissolution/ crystallization of CuTCNQ does not allow the growth of these materials beyond certain dimensions. [32] In addition to dissolution, a physicochemical change occurs through which the original conductive phase I CuTCNQ (4.8 × 10 −3 S cm −1 ) transforms A new bisolvent approach is introduced to overcome the limitation of wet chemical routes of a semiconducting phase I CuTCNQ (7,7,8,8-tetracyanoquinodimethane) synthesis, which currently does not allow these materials to be grown beyond certain dimensions (10-15 µm). The use of water as a cosolvent during acetonitrile-mediated conventional synthesis of CuTCNQ allows a dynamic control over its crystallization and dissolution process through favorably shifting the reaction equilibrium. This enables CuTCNQ structures of unique morphologies with secondary growth, alongside dimensions exceeding 100 µm to be produced. These new morphologies of phase I CuTCNQ show re...

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Role of Water in the Dynamic Crystallization of CuTCNQ for Enhanced Redox Catalysis (TCNQ = Tetracyanoquinodimethane)

Siu

Anderson

Mohammadtaheri

et al. 2017

Adv Materials Inter

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“…The following differential methodology is used to find the exact order with respect to MO. The general form of rate equation for degradation of MO can be written as follows:

- \frac{d A_{normalt}}{d t} = k S {[Oxidant]}^{x} {[A_{normalt}]}^{y} = k_{normalapp} {[Oxidant]}^{x} {[A_{normalt}]}^{y}

…”

Section: Resultsmentioning

confidence: 99%

Curcumin‐Functionalized Ag/Ag₂O Nanocomposites: Efficient Visible‐Light Z‐scheme Photocatalysts

Kumar

Verma

Pal

et al. 2018

Photochem & Photobiology

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Curcumin-functionalized Ag/Ag O (c-Ag/Ag O) nanocomposites with varying proportions of curcumin and Ag/Ag O were prepared by a simple one pot green synthesis protocol in aqueous medium. The plasmonic band undergoes slight redshift, broadening and decrease in intensity with increase in the proportion of Ag O formed. These composite nanoparticles were found to be efficient visible-light photocatalysts for aerobic oxidation of methyl orange and rhodamine B (RhB). Functionalization by curcumin significantly enhanced the photocatalytic activity with good reusability. The photocatalytic oxidation rate showed super linear increase with light intensity because of localized surface plasmon resonance (LSPR)-induced strong near field. The trapping experiments confirmed that superoxide radicals were the main active species responsible for the degradation reaction. A plasmonic Z-scheme photocatalytic mechanism is proposed to explain the possible charge transfer and separation behavior of electron-hole pairs among Ag, Ag O and curcumin under visible-light irradiation.

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“…Newly, the catalytic reduction of nitroaromatic compounds in excess NaBH 4 solution has attracted significant attention because the reductive product has wide applications in many industries . More significantly, reduction of nitrobenzene has become one of the model reactions for estimating the catalytic activity of a wide variety of free or immobilized nanoparticles in aqueous solutions, including metal, metal oxides, alloys and nanocomposites …”

Section: Introductionmentioning

confidence: 99%

Nano NiO/AlMCM‐41, a green synergistic, highly efficient and recyclable catalyst for the reduction of nitrophenols

Derikvand

Rahmati

Azadbakht

2019

Applied Organom Chemis

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Highly ordered mesoporous molecular sieves AlMCM‐41 and a new NiO/AlMCM‐41 nanocomposite were synthesized using a sol–gel method. Fourier transform infrared (FT‐IR) spectroscopy, X‐ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X‐ray spectroscopy (EDX), and N2 adsorption desorption analyses were used to examine the structure, morphology, size and phase composition of the synthesized NiO/AlMCM‐41 nanocomposites. AlMCM‐41 embedded with NiO nanoparticles was subsequently prepared using different nickel loadings in a direct synthetic route. The results show the successful deposition of NiO nanoparticles onto the framework of AlMCM‐41. AlMCM‐41 provides enormous benefits such as environmentally safe, economic viability and porosity when used as support for NiO nanoparticles. The excellent catalytic activities of AlMCM‐41 and NiO/AlMCM‐41 were investigated for the reduction of nitrophenols (4‐NP, 2‐NP) to aminophenols (4‐AP, 2‐AP) in water at ambient temperature. The best observed performance of reduction of NP with 100% conversion into analogous amino derivatives occurred within 6 min with an estimated rate constant of 0.46 min−1. The efficiency of reduction was observed to increase as a function of NiO enrichment. The NiO/AlMCM‐41 nanocomposite could be recycled and reused up to five times without noticeable change in its structure and activity. These properties make NiO/AlMCM‐41 nanocomposite an ideal platform to study various heterogeneous catalytic processes which can have application in purification, catalysis, sensing devices, and green chemistry.

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Solvothermal synthesis of CuO–MgO nanocomposite particles and their catalytic applications

Cited by 67 publications

References 34 publications

Role of Water in the Dynamic Crystallization of CuTCNQ for Enhanced Redox Catalysis (TCNQ = Tetracyanoquinodimethane)

Role of Water in the Dynamic Crystallization of CuTCNQ for Enhanced Redox Catalysis (TCNQ = Tetracyanoquinodimethane)

Curcumin‐Functionalized Ag/Ag₂O Nanocomposites: Efficient Visible‐Light Z‐scheme Photocatalysts

Nano NiO/AlMCM‐41, a green synergistic, highly efficient and recyclable catalyst for the reduction of nitrophenols

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Solvothermal synthesis of CuO–MgO nanocomposite particles and their catalytic applications

Cited by 67 publications

References 34 publications

Role of Water in the Dynamic Crystallization of CuTCNQ for Enhanced Redox Catalysis (TCNQ = Tetracyanoquinodimethane)

Role of Water in the Dynamic Crystallization of CuTCNQ for Enhanced Redox Catalysis (TCNQ = Tetracyanoquinodimethane)

Curcumin‐Functionalized Ag/Ag2O Nanocomposites: Efficient Visible‐Light Z‐scheme Photocatalysts

Nano NiO/AlMCM‐41, a green synergistic, highly efficient and recyclable catalyst for the reduction of nitrophenols

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Curcumin‐Functionalized Ag/Ag₂O Nanocomposites: Efficient Visible‐Light Z‐scheme Photocatalysts