Diverse comparative studies for preferential binding of graphene oxide and transition metal oxide nanoparticles

Ahmad, Shehryar; Ayoub, Muhammad Haris; Khan, Asad Muhammad; Waseem, Amir; Yasir, Muhammad; Khan, Muhammad Saqib; Bajwa, Tariq Mahmood; Shaikh, Ahson Jabbar

doi:10.1016/j.colsurfa.2022.129057

Cited by 26 publications

(8 citation statements)

References 66 publications

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“…The hydrodynamic size accounts for both the physical dimensions and interactions of a particle with its surrounding fluid including solvent molecules and ions, if any. [32] The surface properties of nanoparticles can influence the hydrodynamic size as the particle's surface interacts with the medium, causing variations in its effective size. For example, if a surface coating is added to a particle, it may reduce the effective size by reducing the interactions between the particle and the medium.…”

Section: Hybrid Nio-cuo Nps (Concentration Studies)mentioning

confidence: 99%

Hybrid Nickel‐Copper Oxide Nanoparticles: A Multiparametric Study for the Influence of Synthetic Parameters on the Optical and Physical Properties

Majid,

Usman,

Ibrar

et al. 2024

ChemistrySelect

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The hybrid nanoparticles of nickel and copper oxide are optimized by varying synthetic conditions such as precursor salt concentration, rate of reagent addition, pH, and temperature. The resulting nanoparticles are characterized by using UV‐Visible and fluorescence spectroscopy, hydrodynamic size, zeta potential, polydispersity index, SEM, EDX, XRD, and FTIR spectroscopy. The control over composition and physical properties of these hybrid oxides are analyzed through careful variations in the synthetic parameters. UV‐Vis analysis demonstrated the successful synthesis of NiO‐CuO hybrid nanoparticles at various concentrations. NiO dominant hybrids are obtained by quick addition of the reagent and at higher pH, while CuO dominant hybrids require slower addition of reagent and lower pH. The increase in the temperature causes a hypochromic shift in the UV‐Vis absorption, whereas fluorescence is enhanced with increase in the CuO concentration. The fluorescence generally remained stable by varying time of reagent addition, pH, and temperature. More stable and least‐sized NiO‐CuO hybrid nanoparticles are obtained at ratios of 75 : 25 and 25 : 75, by quick addition of reagent, at higher pH levels, and at higher temperatures. A better understanding of their physical and optical properties obtained by varying synthetic parameters may potentially result in their enhanced applications.

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Section: Hybrid Nio-cuo Nps (Concentration Studies)mentioning

confidence: 99%

Hybrid Nickel‐Copper Oxide Nanoparticles: A Multiparametric Study for the Influence of Synthetic Parameters on the Optical and Physical Properties

Majid,

Usman,

Ibrar

et al. 2024

ChemistrySelect

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“… 17 Adsorption of Co 2+ and Ni 2+ was found to occur primarily on carboxylic surface groups, 18 and electrostatic interactions between cations and negatively charged oxygen groups were proposed. 15 Considering the binding of transition-metal oxides with carbon functional groups, it has been shown that CuO nanoparticles (49 nm in diameter) interact with hydroxyl groups, 19 while TiO 2 nanoparticles (20 nm in diameter) interact also with carbonyl groups 20 through physical interactions or even chemical bonding, including hydrogen bond 21 and coordinate bond. 22 Strong interactions between metal oxides and modified carbons allow for obtaining material with stable nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Speciation of Oxygen Functional Groups on the Carbon Support Controls the Electrocatalytic Activity of Cobalt Oxide Nanoparticles in the Oxygen Evolution Reaction

Ejsmont

Kadela

Grzybek

et al. 2023

ACS Appl. Mater. Interfaces

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The effective use of the active phase is the main goal of the optimization of supported catalysts. However, carbon supports do not interact strongly with metal oxides, thus, oxidative treatment is often used to enhance the number of anchoring sites for deposited particles. In this study, we set out to investigate whether the oxidation pretreatment of mesoporous carbon allows the depositing of a higher loading and a more dispersed cobalt active phase. We used graphitic ordered mesoporous carbon obtained by a hard-template method as active phase support. To obtain different surface concentrations and speciation of oxygen functional groups, we used a low-temperature oxygen plasma. The main methods used to characterize the studied materials were X-ray photoelectron spectroscopy, transmission electron microscopy, and electrocatalytic tests in the oxygen evolution reaction. We have found that the oxidative pretreatment of mesoporous carbon influences the speciation of the deposited cobalt oxide phase. Moreover, the activity of the electrocatalysts in oxygen evolution is positively correlated with the relative content of the COO-type groups and negatively correlated with the CO-type groups on the carbon support. Furthermore, the high relative content of COO-type groups on the carbon support is correlated with the presence of well-dispersed Co3O4 nanoparticles. The results obtained indicate that to achieve a better dispersed and thus more catalytically active material, it is more important to control the speciation of the oxygen functional groups rather than to maximize their total concentration.

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“…Nanostructured transition metal oxide and hydroxide are gained signi cant curiosity from scientists due to their attractive applications such as catalysis [1], optoelectronic [2], sensor [3], phototransistors [4] and dye-sensitized solar cell [5]. Transition metal oxide-like RuO 2 , MnO 2 , CeO 2 , NiO, Co 2 O 3 , CdO and TiO 2 [6][7][8][9][10][11][12][13] as well as hydroxides Ru(OH) 3 , Mn(OH) 2 , Ce(OH) 3 , Ni(OH) 2 , Cd(OH) 2 , Co(OH) 2 and TiO(OH) 2 [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Cd(OH) 2 -CdO Nanoparticles Using Veldt Grape Leaf Extract: Enhanced Dye Degradation and Microbial Resistance

Prammitha

Samson

Jeice

2022

Preprint

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This research work implies the development of a reliable, inexpensive, better and eco-friendly way to fabricate Cd(OH)2 and CdO nanoparticles green synthesis approach using three different source materials. The veldt grape leaf act as a chelating agent. The physical properties of prepared samples were analyzed by various characterization techniques such as X-Ray Diffractometer, Fourier Transform Infra-Red, Scanning Electron Microscopy, X-Ray Energy Dispersive Spectrometer, High-Resolution Transmission Electron Microscopy and UV-Visible Spectrometer. The investigation of the structural analysis showed the existence of Cd(OH)2, mixed Cd(OH)2/CdO and CdO nanoparticles. The optical absorption wavelength at 294nm in UV-Vis spectra confirmed that the reduction of Cd2+ ions. FTIR spectra display the vibrational modes of veldt grape leaf extract involved in chemical bonding and reductions. From EDAX spectrum confirmed the presence of Cd and O elements in the prepared samples. SEM and HRTEM images revealed nanorods, platelet and spherical shape morphologies with particle size ranging from 5.7 to 29nm. The photocatalytic activity of prepared nanoparticles was tested by degrading anionic and cationic dyes like congo red, methyl orange and crystal violet under UV-light irradiation. As well as antimicrobial activity was evaluated against gram-positive staphylococcus aureus, gram-negative proteus vulgaris and fungal- aspergillus niger. Comparing these three products CdO NPs exhibit high performance on both microbial and photocatalytic activity without a secondary product. Thus, the prepared CdO nanoparticles may further use in sewage treatment and biomedical applications.

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Diverse comparative studies for preferential binding of graphene oxide and transition metal oxide nanoparticles

Cited by 26 publications

References 66 publications

Hybrid Nickel‐Copper Oxide Nanoparticles: A Multiparametric Study for the Influence of Synthetic Parameters on the Optical and Physical Properties

Hybrid Nickel‐Copper Oxide Nanoparticles: A Multiparametric Study for the Influence of Synthetic Parameters on the Optical and Physical Properties

Speciation of Oxygen Functional Groups on the Carbon Support Controls the Electrocatalytic Activity of Cobalt Oxide Nanoparticles in the Oxygen Evolution Reaction

Synthesis of Cd(OH) 2 -CdO Nanoparticles Using Veldt Grape Leaf Extract: Enhanced Dye Degradation and Microbial Resistance

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