Magnetic Fe3O4@MgAl–LDH composite grafted with cobalt phthalocyanine as an efficient heterogeneous catalyst for the oxidation of mercaptans

Kumar, Pawan; Gill, Kareena; Kumar, Sunil; Ganguly, Sudip K.; Jain, Suman L.

doi:10.1016/j.molcata.2015.03.001

Cited by 48 publications

(14 citation statements)

References 46 publications

(46 reference statements)

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“…55 The catalytic oxidation of organic thiols into disulfides was found to be a temperature-related process. 56 Thus, this finding implies a temperature-enhanced catalytic activity of GSH oxidation by the PEG-MoS 2 , which can explain the rapid bacterial death under NIR-induced hyperthermia. The possibly antibacterial mechanism was proposed: (1) Cell walls damage arise from the generation of •OH from low concentration of H 2 O 2 under the existence of the PEG-MoS 2 ;…”

Section: Resultsmentioning

confidence: 72%

“…Notably, MoS 2 could facilitate the oxidation of organic thiols (R–SH) to yield disulfides (R–S–S–R) . The catalytic oxidation of organic thiols into disulfides was found to be a temperature-related process . Thus, this finding implies a temperature-enhanced catalytic activity of GSH oxidation by the PEG-MoS 2 , which can explain the rapid bacterial death under NIR-induced hyperthermia.…”

Section: Resultsmentioning

confidence: 99%

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Functionalized Nano-MoS₂ with Peroxidase Catalytic and Near-Infrared Photothermal Activities for Safe and Synergetic Wound Antibacterial Applications

et al. 2016

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We have developed a biocompatible antibacterial system based on polyethylene glycol functionalized molybdenum disulfide nanoflowers (PEG-MoS NFs). The PEG-MoS NFs have high near-infrared (NIR) absorption and peroxidase-like activity, which can efficiently catalyze decomposition of low concentration of HO to generate hydroxyl radicals (·OH). The conversion of HO into ·OH can avoid the toxicity of high concentration of HO and the ·OH has higher antibacterial activity, making resistant bacteria more vulnerable and wounds more easily cured. The PEG-MoS NFs combine the catalysis with NIR photothermal effect, providing a rapid and effective killing outcome in vitro for Gram-negative ampicillin resistant Escherichia coli (Amp E. coli) and Gram-positive endospore-forming Bacillus subtilis (B. subtilis) as compared to catalytic treatment or photothermal therapy (PTT) alone. Wound healing results indicate that the synergy antibacterial system could be conveniently used for wound disinfection in vivo. Interestingly, glutathione (GSH) oxidation can be accelerated due to the 808 nm irradiation induced hyperthermia at the presence of PEG-MoS NFs proved by X-ray near-edge absorption spectra and X-ray spectroscopy. The accelerated GSH oxidation can result in bacterial death more easily. A mechanism based on ·OH-enhanced PTT is proposed to explain the antibacterial process.

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Section: Resultsmentioning

confidence: 72%

Section: Resultsmentioning

confidence: 99%

Functionalized Nano-MoS₂ with Peroxidase Catalytic and Near-Infrared Photothermal Activities for Safe and Synergetic Wound Antibacterial Applications

et al. 2016

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“…However, when a magnetically recyclable MgAl-LDHs tethered phthalocyanine was used, oxidation can occur without using an alkali. 362 Interestingly, in the recent years, several visible light active LDHs have been synthesized by changing the metal combination (Zn/Cr, Mg/Cr, Zn/Fe, Mg/Fe, Cu/Cr, Co/ Cr), doping (Cu, Ni, Zn), and intercalated ions in between brucite layers. The simplicity of LDH synthesis by coprecipitation provides an opportunity to play with compositions, and many fractional composition LDHs have been reported for the photocatalytic applications, especially CO 2 reduction due to the weak acidic nature of CO 2 .…”

Section: Carbon Nitride−metal Oxide 2d/2d Vdw Structuresmentioning

confidence: 99%

Boosting Photocatalytic Activity Using Carbon Nitride Based 2D/2D van der Waals Heterojunctions

et al. 2021

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The surging demand for energy and staggering pollutants in the environment have geared the scientific community to explore sustainable pathways that are economically feasible and environmentally compelling. In this context, harnessing solar energy using semiconductor materials to generate charge pairs to drive photoredox reactions has been envisioned as a futuristic approach. Numerous inorganic crystals with promising nanoregime properties investigated in the past decade have yet to demonstrate practical application due to limited photon absorption and sluggish charge separation kinetics. Two-dimensional semiconductors with tunable optical and electronic properties and quasi-resistance-free lateral charge transfer mechanisms have shown great promise in photocatalysis. Polymeric graphitic carbon nitride (g-C3N4) is among the most promising candidates due to fine-tuned band edges and the feasibility of optimizing the optical properties via materials genomics. Constructing a two-dimensional (2D)/2D van der Waals (vdW) heterojunction by allies of 2D carbon nitride sheets and other 2D semiconductors has demonstrated enhanced charge separation with improved visible photon absorption, and the performance is not restricted by the lattice matching of constituting materials. With the advent of new 2D semiconductors over the recent past, the 2D/2D heterojunction assemblies are gaining momentum to design high performance photocatalysts for numerous applications. This review aims to highlight recent advancements and key understanding in carbon nitride based 2D/2D heterojunctions and their applications in photocatalysis, including small molecules activation, conversion, and degradations. We conclude with a forward-looking perspective discussing the key challenges and opportunity areas for future research.

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“…Recently, Jaina et al [55] published a work where they described the synthesis of a magnetically separable LDH named Mg/Al-LDH@Fe 3 O 4 . The authors used this solid to immobilize a cobalt phthalocyanine catalyst.…”

Section: Ldh and Lhs As Support For Metalloporphyrin Immobilizationmentioning

confidence: 99%

“…The resulting material effectively catalyzed the oxidation of mercaptans by molecular oxygen in aqueous medium. An external magnetic field promoted easy recovery of this catalyst from the reaction medium [55]. Facile catalyst recovery and reuse allied with the use of molecular oxygen and water as solvent qualified this solid as an interesting catalyst for green processes.…”

Section: Ldh and Lhs As Support For Metalloporphyrin Immobilizationmentioning

confidence: 99%

Recent Advances in Solid Catalysts Obtained by Metalloporphyrins Immobilization on Layered Anionic Exchangers: A Short Review and Some New Catalytic Results

et al. 2016

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Layered materials are a very interesting class of compounds obtained by stacking of two-dimensional layers along the basal axis. A remarkable property of these materials is their capacity to interact with a variety of chemical species, irrespective of their charge (neutral, cationic or anionic). These species can be grafted onto the surface of the layered materials or intercalated between the layers, to expand or contract the interlayer distance. Metalloporphyrins, which are typically soluble oxidation catalysts, are examples of molecules that can interact with layered materials. This work presents a short review of the studies involving metalloporphyrin immobilization on two different anionic exchangers, Layered Double Hydroxides (LDHs) and Layered Hydroxide Salts (LHSs), published over the past year. After immobilization of anionic porphyrins, the resulting solids behave as reusable catalysts for heterogeneous oxidation processes. Although a large number of publications involving metalloporphyrin immobilization on LDHs exist, only a few papers have dealt with LHSs as supports, so metalloporphyrins immobilized on LHSs represent a new and promising research field. This work also describes new results on an anionic manganese porphyrin (MnP) immobilized on Mg/Al-LDH solids with different nominal Mg/Al molar ratios (2:1, 3:1 and 4:1) and intercalated with different anions (CO 3 2´o r NO 3´) . The influence of the support composition on the MnP immobilization rates and the catalytic performance of the resulting solid in cyclooctene oxidation reactions will be reported.

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Magnetic Fe3O4@MgAl–LDH composite grafted with cobalt phthalocyanine as an efficient heterogeneous catalyst for the oxidation of mercaptans

Cited by 48 publications

References 46 publications

Functionalized Nano-MoS₂ with Peroxidase Catalytic and Near-Infrared Photothermal Activities for Safe and Synergetic Wound Antibacterial Applications

Functionalized Nano-MoS₂ with Peroxidase Catalytic and Near-Infrared Photothermal Activities for Safe and Synergetic Wound Antibacterial Applications

Boosting Photocatalytic Activity Using Carbon Nitride Based 2D/2D van der Waals Heterojunctions

Recent Advances in Solid Catalysts Obtained by Metalloporphyrins Immobilization on Layered Anionic Exchangers: A Short Review and Some New Catalytic Results

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Magnetic Fe3O4@MgAl–LDH composite grafted with cobalt phthalocyanine as an efficient heterogeneous catalyst for the oxidation of mercaptans

Cited by 48 publications

References 46 publications

Functionalized Nano-MoS2 with Peroxidase Catalytic and Near-Infrared Photothermal Activities for Safe and Synergetic Wound Antibacterial Applications

Functionalized Nano-MoS2 with Peroxidase Catalytic and Near-Infrared Photothermal Activities for Safe and Synergetic Wound Antibacterial Applications

Boosting Photocatalytic Activity Using Carbon Nitride Based 2D/2D van der Waals Heterojunctions

Recent Advances in Solid Catalysts Obtained by Metalloporphyrins Immobilization on Layered Anionic Exchangers: A Short Review and Some New Catalytic Results

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Product

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Functionalized Nano-MoS₂ with Peroxidase Catalytic and Near-Infrared Photothermal Activities for Safe and Synergetic Wound Antibacterial Applications

Functionalized Nano-MoS₂ with Peroxidase Catalytic and Near-Infrared Photothermal Activities for Safe and Synergetic Wound Antibacterial Applications