NiCo2O4 nanoparticles anchored on reduced graphene oxide with enhanced catalytic activity towards the reduction of p-Nitrophenol in water

Jacob, Bibin; Mohan, Manoj; Dhanyaprabha, K C; Thomas, Hysen

doi:10.1016/j.colsurfa.2022.128717

Cited by 20 publications

(11 citation statements)

References 91 publications

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“…Ag@CuHCF consists a peak at 777 cm −1 which may correspond to the Ag‐Cu vibration because this peak was not present in CuHCF. Compared with Ag‐Cu FTIR, this peak corresponds to 659 cm −1 44 . The shifting to the band and decrease in intensity of the band suggests the doping of Ag with the surface of CuHCF.…”

Section: Results Discussionmentioning

confidence: 93%

“…Compared with Ag-Cu FTIR, this peak corresponds to 659 cm À1 . 44 The shifting to the band and decrease in intensity of the band suggests the doping of Ag with the surface of CuHCF. Similarly, these peaks near 3401, 1987, and 1666 cm À1 were found both in Ag@FeHCF and Ag@ZnHCF correspond to O H stretching, CN stretching, and HOH bending vibrations, respectively.…”

Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 99%

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Green synthesis of silver‐doped metal hexacyanoferrates nanostructures for efficient cleanup of endocrine‐disrupting pesticides

Rani,

Choudhary,

Shanker

2023

Env Prog and Sustain Energy

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Herein, inexpensive and eco‐friendly approach for the green synthesis of silver‐doped metal hexacyanoferrates (Ag@MHCFs) nanocomposite using green tea extract has been reported. Silver‐doped MHCF nanocatalysts were used to photo‐degradation endocrine disruptor pesticides, namely endosulfan (ES) and atrazine (AT), from water under direct Sunlight. Spectroscopic and electron microscopic techniques confirmed the successful synthesis of nanomaterials. Ag@FeHCF observed maximum degradation efficiency due to their high surface area (89.3 m2g−1), significant zeta potential (−43.4 mV), lower band gap (1.5 eV), and low photoluminescence intensity as compared to other Ag doped MHCFs. Best degradation results showed with concentration amount (5 mg L−1), dose (20 mg of ES; 15 mg of AT), at neutral pH under sunlight irradiation. Degradation up to 98% for ES and 96% for AT was reported. The degradation ensued by Langmuir adsorption and first‐order kinetics. GC–MS analysis showed the degradation of pesticides into CO2, H2O, and harmless minor metabolites under Sunlight. Ag@FeHCF have indicated high reusability (n = 10), ensuring their charge separation, stability, and sustainability. Ag@MHCF nanoparticles may show as substitute catalysts for industrial use with a fervent scope.

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Section: Results Discussionmentioning

confidence: 93%

Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 99%

Green synthesis of silver‐doped metal hexacyanoferrates nanostructures for efficient cleanup of endocrine‐disrupting pesticides

Rani,

Choudhary,

Shanker

2023

Env Prog and Sustain Energy

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“…The observed values of rate constants were compared with various recently reported results from similar materials in the literature and are shown in Table S2, where similar heterogeneous catalysis of p -NP was performed. The activity factor ( A F ) was also calculated as per the relation where k and m are the rate constant and active mass of the catalyst, respectively, and the values at 2 mg mL –1 are plotted in bars (see Figure F). The obtained values for all other configurations are listed in Table S2, showing the superiority of NiMn LDH_6H over other catalysts at all catalyst concentrations.…”

Section: Resultsmentioning

confidence: 99%

NiMn-Layered Double Hydroxide Porous Nanoarchitectures as a Bifunctional Material for Accelerated p-Nitrophenol Reduction and Freestanding Supercapacitor Electrodes

Sharma

Aman

Omar

2022

ACS Appl. Nano Mater.

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The prolonged reactions for phase and morphology stabilization remain an issue in layered double hydroxides (LDHs), for example, NiMn LDH. The present work proposes a rational strategy for tuning the interfacial surface chemistry in the NiMn LDH phase to obtain grassy-mat-like porous nanoarchitectures. The approach gifts a morphology possessing a high specific surface area available for the ions’ adsorption and desorption, thereby enhancing the extent of reversible reactions. The porous nanoarchitecture displays excellent catalytic activity by reducing p-nitrophenol in just ∼300 s with a rate constant of 0.231 min–1 at a 2 mg mL–1 concentration. Alongside, as a freestanding binder-free supercapacitor electrode, the material delivers a high specific capacitance of ∼568 F g–1 at 1 mA cm–2, which is highest among all NiMn LDH variants prepared at different reaction times. The fabricated symmetric supercapacitor exhibits an excellent energy and a power density of ∼22 W h kg–1 at 1 mA cm–2 and ∼6429 W kg–1 at 10 mA cm–2, respectively. The device retains ∼83% capacitance, at 10 mA cm–2, after 5000 charge–discharge cycles. To the best of our knowledge, this is the first report where NiMn LDH is optimized in a shorter duration and proposed as a competitive bifunctional material for heterogeneous catalysis and supercapacitors.

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“…It can also help in the adsorption of p-NP, thus, enhancing its proximity toward the catalyst, which promotes the catalytic process. Jacob et al used NiCo 2 O 4 NPs anchored on reduced graphene oxide for catalytic reduction of p-NP . Guo et al reported the plasma-catalytic degradation of aqueous p-NP with graphene-ZnO .…”

Section: Introductionmentioning

confidence: 99%

“…Jacob et al used NiCo 2 O 4 NPs anchored on reduced graphene oxide for catalytic reduction of p-NP. 17 Guo et al reported the plasma-catalytic degradation of aqueous p-NP with graphene-ZnO. 18 However, experiments with these catalysts lack reusability, optimization of process parameters, and economic analysis, which limits their large-scale trials.…”

Section: Introductionmentioning

confidence: 99%

CuO/TiO₂/ZnO NPs Anchored Hydrogen Exfoliated Graphene: To Comprehend the Role of Graphene in Catalytic Reduction of p-Nitrophenol

Behera,

Alqahtani,

Chakrabortty

et al. 2023

ACS Omega

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The present study deals with sonochemically in situ synthesis of a novel functional catalyst using hydrogen exfoliated graphene (HEG) supported titanium dioxide (TiO2) and copper sulfate (CuSO4) doped with zinc oxide (ZnO) (abbreviated as Ti/Cu/Zn-HEG). The synthesis of the Ti/Cu/Zn-HEG nanocomposite (NCs) catalyst was confirmed through its characterizations by XRD, SEM-EDX, TEM, XPS, FTIR, and BET methods. It was assessed for catalytic conversion of a model aromatic compound para-nitrophenol (p-NP) in an aqueous solution. The p-NP is a nitroaromatic compound that has a toxic and mutagenic effect. Its removal from the water system is necessary to protect the environment and living being. The newly synthesized Ti/Cu/Zn-HEG NCs were applied for their higher stability and catalytic activity as a potential candidate for reducing p-NP in practice. The operating parameters, such as p-NP concentration, catalyst dosage, and operating time were optimized for 150 ppm, 400 ppm, and 10 min through response surface methodology (RSM) in Design-Expert software to obtain the maximum reduction p-NP up to 98.4% at its normal pH of 7.1 against the controls (using HEG, Ti/Cu-HEG, and Zn-HEG). Analysis of variance of the response suggested the regression equation to be significant for the process with a major impact on catalyst concentration and operating time. The model prediction data (from RSM) and experimental data were corroborated well as reflected through model’s low relative error (RE < 0.10), high regression coefficient (R 2 > 0.97), and Willmott d-index (d will‑index > 0.95) values.

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NiCo2O4 nanoparticles anchored on reduced graphene oxide with enhanced catalytic activity towards the reduction of p-Nitrophenol in water

Cited by 20 publications

References 91 publications

Green synthesis of silver‐doped metal hexacyanoferrates nanostructures for efficient cleanup of endocrine‐disrupting pesticides

Green synthesis of silver‐doped metal hexacyanoferrates nanostructures for efficient cleanup of endocrine‐disrupting pesticides

NiMn-Layered Double Hydroxide Porous Nanoarchitectures as a Bifunctional Material for Accelerated p-Nitrophenol Reduction and Freestanding Supercapacitor Electrodes

CuO/TiO₂/ZnO NPs Anchored Hydrogen Exfoliated Graphene: To Comprehend the Role of Graphene in Catalytic Reduction of p-Nitrophenol

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NiCo2O4 nanoparticles anchored on reduced graphene oxide with enhanced catalytic activity towards the reduction of p-Nitrophenol in water

Cited by 20 publications

References 91 publications

Green synthesis of silver‐doped metal hexacyanoferrates nanostructures for efficient cleanup of endocrine‐disrupting pesticides

Green synthesis of silver‐doped metal hexacyanoferrates nanostructures for efficient cleanup of endocrine‐disrupting pesticides

NiMn-Layered Double Hydroxide Porous Nanoarchitectures as a Bifunctional Material for Accelerated p-Nitrophenol Reduction and Freestanding Supercapacitor Electrodes

CuO/TiO2/ZnO NPs Anchored Hydrogen Exfoliated Graphene: To Comprehend the Role of Graphene in Catalytic Reduction of p-Nitrophenol

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CuO/TiO₂/ZnO NPs Anchored Hydrogen Exfoliated Graphene: To Comprehend the Role of Graphene in Catalytic Reduction of p-Nitrophenol