Solvent free synthesis of chalcones over graphene oxide-supported MnO2 catalysts synthesized via combustion route

Kumar, Aniket; Rout, Lipeeka; Achary, L. Satish K.; Mohanty, Sangram Keshari; Nayak, Pratap S.; Barik, Bapun; Dash, Priyabrat

doi:10.1016/j.matchemphys.2020.124019

Cited by 16 publications

(5 citation statements)

References 71 publications

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“…Kumar et al 122 identified GO–MnO 2 as a possible catalyst for the production of chalcones by Claisen–Schmidt condensation ( Scheme 23 ). When compared to pure MnO 2 and GO, the catalytic activity of GO–MnO 2 was better.…”

Section: Application Of Graphene Oxide As the Catalysis For Different...mentioning

confidence: 99%

An Update on Graphene Oxide: Applications and Toxicity

et al. 2022

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Graphene oxide (GO) has attracted much attention in the past few years because of its interesting and promising electrical, thermal, mechanical, and structural properties. These properties can be altered, as GO can be readily functionalized. Brodie synthesized the GO in 1859 by reacting graphite with KClO 3 in the presence of fuming HNO 3 ; the reaction took 3−4 days to complete at 333 K. Since then, various schemes have been developed to reduce the reaction time, increase the yield, and minimize the release of toxic byproducts (NO 2 and N 2 O 4 ). The modified Hummers method has been widely accepted to produce GO in bulk. Due to its versatile characteristics, GO has a wide range of applications in different fields like tissue engineering, photocatalysis, catalysis, and biomedical applications. Its porous structure is considered appropriate for tissue and organ regeneration. Various branches of tissue engineering are being extensively explored, such as bone, neural, dentistry, cartilage, and skin tissue engineering. The band gap of GO can be easily tuned, and therefore it has a wide range of photocatalytic applications as well: the degradation of organic contaminants, hydrogen generation, and CO 2 reduction, etc. GO could be a potential nanocarrier in drug delivery systems, gene delivery, biological sensing, and antibacterial nanocomposites due to its large surface area and high density, as it is highly functionalized with oxygen-containing functional groups. GO or its composites are found to be toxic to various biological species and as also discussed in this review. It has been observed that superoxide dismutase (SOD) and reactive oxygen species (ROS) levels gradually increase over a period after GO is introduced in the biological systems. Hence, GO at specific concentrations is toxic for various species like earthworms, Chironomus riparius, Zebrafish, etc.

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Section: Application Of Graphene Oxide As the Catalysis For Different...mentioning

confidence: 99%

An Update on Graphene Oxide: Applications and Toxicity

et al. 2022

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“…Globally, the focus on low-carbon emissions and the concept of sustainability has notably proposed the development of sustainable energy sources [1,2]. Electrochemical energy storage tools such as metal-air batteries (MABs) and fuel cells are considered to play a significant impact in the transformation to a sustainable prospect [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Influence of nickel doping on MnO2 nanoflowers as electrocatalyst for oxygen reduction reaction

2021

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Doping is promising strategy for the alteration of nanomaterials to enhance their optical, electrical, and catalytic activities. The development of electrocatalysts for oxygen reduction reactions (ORR) with excellent activity, low cost and durability is essential for the large-scale utilization of energy storage devices such as batteries. In this study, MnO2 and Ni-doped MnO2 nanowires were prepared through a simple co-perception technique. The influence of nickel concentration on electrochemical performance was studied using linear sweep voltammetry and cyclic voltammetry. The morphological, thermal, structural, and optical properties of MnO2 and Ni-doped MnO2 nanowires were examined by SEM, ICP-OES, FT-IR, XRD, UV–Vis, BET and TGA/DTA. Morphological analyses showed that pure MnO2 and Ni-doped MnO2 had flower-like and nanowire structures, respectively. The XRD study confirmed the phase transformation from ε to α and β phases of MnO2 due to the dopant. It was also noted from the XRD studies that the crystallite sizes of pure MnO2 and Ni-doped MnO2 were in the range of 2.25–6.6 nm. The band gaps of MnO2 and 0.125 M Ni-doped MnO2 nanoparticles were estimated to be 2.78 and 1.74 eV, correspondingly, which can be seen from UV–Vis. FTIR spectroscopy was used to determine the presence of functional groups and M–O bonds (M = Mn, Ni). The TGA/TDA examination showed that Ni-doping in MnO2 led to an improvement in its thermal properties. The cyclic voltammetry results exhibited that Ni-doped MnO2 nanowires have remarkable catalytic performance for ORR in 0.1 M KOH alkaline conditions. This work contributes to the facile preparation of highly active and durable catalysts with improved catalytic performance mainly due to the predominance of nickel. Article Highlights MnO2 and Ni-doped MnO2 nanowires were synthesized via a facile co-perception approach. Nickel doping in MnO2 induces the formation of wire-like nanostructures. Nickel doping enhances the electrochemical activity and thermal stability of MnO2 nanoflowers. The addition of nickel into MnO2 promoted the catalytic activity for oxygen reduction reaction. A higher catalytic activity was achieved in 0.125 M Ni-MnO2 nanowires. Graphic abstract

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Section: Greener Synthesis Of Chalcones and Their Derivativesmentioning

confidence: 99%

“…Solvent-free synthesis of chalcones was reported using graphene oxide-supported MnO 2 catalysts prepared by a green solution combustion technique [ 49 ]. The nanocatalysts could be applied for synthesizing chalcones through Claisen-Schmidt condensation, wherein the chalcones were obtained with high yields at 110 °C under solvent-free conditions in a short period of time [ 49 ]. In another study, Ca(OH) 2 and K–Ca(OH) 2 catalysts were synthesized from chicken eggshell wastes in an eco-friendly manner with high efficiency, cost-effectiveness, stability, and recyclability.…”

Section: Greener Synthesis Of Chalcones and Their Derivativesmentioning

confidence: 99%

Antiviral and antimicrobial applications of chalcones and their derivatives: From nature to greener synthesis

Nematollahi,

Mehrabani,

Hozhabri

et al. 2023

Heliyon

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Solvent free synthesis of chalcones over graphene oxide-supported MnO2 catalysts synthesized via combustion route

Cited by 16 publications

References 71 publications

An Update on Graphene Oxide: Applications and Toxicity

An Update on Graphene Oxide: Applications and Toxicity

Influence of nickel doping on MnO2 nanoflowers as electrocatalyst for oxygen reduction reaction

Antiviral and antimicrobial applications of chalcones and their derivatives: From nature to greener synthesis

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