Comparative evaluation of manganese oxide and its graphene oxide nanocomposite as polyphenol oxidase mimics

Singh, Manminder; Kaur, Manpreet; Sangha, Manjeet Kaur; Ubhi, Manpreet Kaur

doi:10.1016/j.mtcomm.2021.102237

Cited by 7 publications

(6 citation statements)

References 58 publications

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“…Hysteresis plot in single-domain ferrimagnetic particles vanishes when particle size becomes so small that the maximum anisotropy energy becomes close to the thermal energy, and the process of flipping of the single domain spin becomes inhibited. These types of particles do not possess any coercivity and their magnetization never becomes saturated even at very high applied field [ 26 , 36 , 37 ]. The presence of hysteresis loop indicates that particles are multidomain in the present studies.…”

Section: Resultsmentioning

confidence: 99%

“…They are ceramic materials made by physical and chemical blending of iron (III) oxide with modest amounts of other elements. The size, chemical composition, and particle interaction with the surrounding matrix all influence the properties of ferrite NPs [ 25 , 26 , 27 ]. To identify polyphenols, we have proposed a facile colorimetric method based on the polyphenol oxidase-mimicking activity of MgFe 2 O 4 @Mn 3 O 4 nanocomposite.…”

Section: Introductionmentioning

confidence: 99%

“…Sol-gel synthesis provides numerous benefits over traditional approaches for producing high-quality NPs with uniformity and purity. It operates at low temperatures and has ability to produce fine powders [ 26 ]. Ultrasonication approach helps in fine blending of the NPs in the nanocomposite.…”

Section: Introductionmentioning

confidence: 99%

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Nanocomposite of MgFe2O4 and Mn3O4 as Polyphenol Oxidase Mimic for Sensing of Polyphenols

Kaur

Aggarwal

et al. 2022

Biosensors

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Polyphenol oxidase (PPO) mimics have advantage of detection and remediation of polyphenols. This work demonstrates rapid and sensitive colorimetric detection of phenolic compounds using nanocomposite of magnesium ferrite (MgFe2O4) and manganese oxide (Mn3O4) nanoparticles as PPO mimic. The catalytic properties of MgFe2O4 and Mn3O4 displayed synergistic effect in the nanocomposite. The synthesized nanocomposite and nanoparticles were fully characterized using various analytical techniques. The ratio of MgFe2O4 and Mn3O4 in the nanocomposite was optimized. Catechol and resorcinol were taken as model polyphenols. The best PPO-activity was shown by MgFe2O4@Mn3O4 nanocomposite with of w/w ratio 1:2. The results correlated with its higher surface area. Reaction parameters viz. pH, temperature, contact time, substrate concentration, and nanoparticles dose were studied. The synthesized MgFe2O4@Mn3O4 nanocomposite was used for the detection of catechol in the linear range of 0.1–0.8 mM with the detection limit of 0.20 mM, and resorcinol in the range of 0.01–0.08 mM with the detection limit of 0.03 mM. The estimated total phenolic content of green and black tea correlated well with the conventional method. These results authenticate promising future potential of MgFe2O4@Mn3O4 nanocomposite as PPO-mimic.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nanocomposite of MgFe2O4 and Mn3O4 as Polyphenol Oxidase Mimic for Sensing of Polyphenols

Kaur

Aggarwal

et al. 2022

Biosensors

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“…35 After oxidation and hydrothermal processes, peaks that corresponding to Mn-O (613, 483 cm -1 ) and Zn-O (524 cm -1 ) were recorded, implying that the sorbents MnO x /24PCNFs and Zn@MnO x /24PCNFs have been successfully synthesized. 36,37 The chemical composition and state of elements in sorbents MnO x /24PCNFs and Zn@MnO x /24PCNFs composites were examined by XPS, as shown in Figure . 3d, in which elements C, N, O and Mn were identified, while element Zn was traced in spectrum of Zn@MnO x /24PCNFs. High resolution spectrum of Mn 2p was presented to investigate the properties of Mn in the as-prepared sorbent MnO x /24PCNFs.…”

Section: Resultsmentioning

confidence: 99%

Porous Carbon Nanofibers Supported Zn@MnOx Sorbents with High Dispersion and Loading for Hot Coal Gas Desulfurization

Lai

Ye²,

Zhang³

et al. 2022

Preprint

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Sorbent with a great quantity of highly dispersed active components is of importance to achieve excellent desulfurization performance. Thus, Zn@MnOx/porous carbon nanofibers (PCNFs) sorbents have been constructed via electrospinning, carbonization, activation and hydrothermal techniques in this study. The as-prepared sorbent realizes a sulfur capacity of 9.63 g S 100 g-1 sorbent and a utilization rate 117% of ZnO, which could be attributed to the synergetic effects of the enlarged surface area of PCNFs and uniformly distributed active components. The specific surface area of modified PCNFs is nearly five times higher than that of the pristine CNFs, providing larger loading area and more attachment sites for metal oxides. Activation with KMnO4 not only generates active MnOx components but also presets ‘seed’ for ZnO crystals growth, which is beneficial for the high dispersion of nano-sized active components. The presented method is beneficial to producing sorbents with better structure and promoted desulfurization performance.

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“…Upon graphite oxidation using strong acids, viz. phosphoric acid (H 2 PO 4 ), sulfuric acid (H 2 SO 4 ), and oxidizing agents such as permanganate (

), numerous oxygen-bearing moieties, i.e., ketones, carboxyl, epoxides, and hydroxyl, are obtained on the surface of the graphite and the oxidised form is known as graphene oxide (GO) [ 37 , 38 ]. GO can be chemically modified to produce 2D channels with controlled porosity for purifying water [ 39 , 40 ].…”

Section: Introductionmentioning

confidence: 99%

Phosphorous- and Boron-Doped Graphene-Based Nanomaterials for Energy-Related Applications

et al. 2023

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Doping is a great strategy for tuning the characteristics of graphene-based nanomaterials. Phosphorous has a higher electronegativity as compared to carbon, whereas boron can induce p-type conductivity in graphene. This review provides insight into the different synthesis routes of phosphorous- and boron-doped graphene along with their applications in supercapacitors, lithium- ions batteries, and cells such as solar and fuel cells. The two major approaches for the synthesis, viz. direct and post-treatment methods, are discussed in detail. The former synthetic strategies include ball milling and chemical vapor discharge approaches, whereas self-assembly, thermal annealing, arc-discharge, wet chemical, and electrochemical erosion are representative post-treatment methods. The latter techniques keep the original graphene structure via more surface doping than substitutional doping. As a result, it is possible to preserve the features of the graphene while offering a straightforward handling technique that is more stable and controllable than direct techniques. This review also explains the latest progress in the prospective uses of graphene doped with phosphorous and boron for electronic devices, i.e., fuel and solar cells, supercapacitors, and batteries. Their novel energy-related applications will continue to be a promising area of study.

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Comparative evaluation of manganese oxide and its graphene oxide nanocomposite as polyphenol oxidase mimics

Cited by 7 publications

References 58 publications

Nanocomposite of MgFe2O4 and Mn3O4 as Polyphenol Oxidase Mimic for Sensing of Polyphenols

Nanocomposite of MgFe2O4 and Mn3O4 as Polyphenol Oxidase Mimic for Sensing of Polyphenols

Porous Carbon Nanofibers Supported Zn@MnOx Sorbents with High Dispersion and Loading for Hot Coal Gas Desulfurization

Phosphorous- and Boron-Doped Graphene-Based Nanomaterials for Energy-Related Applications

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