Polyethylenimine modified ultrafine palladium nanocrystals on reduced graphene oxide for hexavalent chromium reduction

Yin, Yu; Hao, Jun; Yang, Yi; Zhao, Jun; Song, Jié

doi:10.1016/j.apsusc.2021.149926

Cited by 14 publications

(6 citation statements)

References 77 publications

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“…Furthermore, the turnover frequency (TOF = [product]/([catalytic active site] × t min ) was calculated as 28.9 mol Cr(VI) ·mol Redox –1 ·min –1 . The obtained value is 20–1000× higher than that of some of the Pd-based efficient catalytic systems, like polyethylenimine-Pd-nano (1.16 mol Cr(VI) ·mol Redox –1 ·min –1 ), Pd@Reduced graphene oxide (0.496 mol Cr(VI) ·mol Redox –1 ·min –1 ), Pd@Fe 3 O 4 –nanocellulose (0.256 mol Cr(VI) ·mol Redox –1 ·min –1 ), Pd@polyethylene sulfonate (0.117 mol Cr(VI) ·mol Redox –1 ·min –1 ), and Pd@Fe 3 O 4 -microsphere carbon (0.032 mol Cr(VI) ·mol Redox –1 ·min –1 ) (Table ). These results indicate a high-performance electrocatalytic reduction-based detoxification of the Cr(VI) by this organic molecular redox species-modified electrode at an ambient temperature (25 ± 2 °C).…”

Section: Resultsmentioning

confidence: 84%

“…Since the electrocatalyst is not interfering with Cr(III) and dissolved oxygen species, experiments were carried out out using a single •min −1 . The obtained value is 20−1000× higher than that of some of the Pd-based efficient catalytic systems, like polyethylenimine-Pd-nano (1.16 mol Cr(VI) • mol Redox −1 •min −1 ), 70 Pd@Reduced graphene oxide (0.496 mol Cr(VI) •mol Redox −1 •min −1 ), 71 Pd@Fe 3 O 4 −nanocellulose (0.256 mol Cr(VI) •mol Redox −1…”

Section: Catalytic Active Sitementioning

confidence: 73%

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High-Performance Electrocatalytic Reduction and Sensing of Hazardous Hexavalent Chromium Using a Redox-Active Binol Species-Impregnated Carbon Nanofiber-Modified Electrode

Srinivas

Kumar

2022

J. Phys. Chem. C

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Electrochemical reduction of the hexavalent chromium compounds, a serious environmental pollutant and carcinogen, to a nontoxic Cr(III) species is of significant research interest in interdisciplinary areas. Due to its high oxidation potential (1.36 V vs RHE) and associated surface fouling problems with organic-electrocatalyst systems, expensive precious metalbased electrodes like Au, Ag, Pt, and Pd have been widely used for this purpose. Herein we report, an in situ electrochemically prepared highly redox-active Binol species (Binol-Redox)-impregnated carbon nanofiber-modified electrode (CNF@Binol-Redox), E o ′ = 0.50 V versus Ag/AgCl and surface excess value (Γ Binol-Redox ) = 32.5 × 10 −9 mol•cm −2 , as a low-cost, stable, and highperformance molecular electrocatalyst for selective electrochemical reduction of Cr(VI) species in pH 2 HCL/KCl. The new electrode material was characterized using SEM, FTIR, Raman, GC-MS, 1 H NMR (active site isolated as an ethanolic extract), and scanning electrochemical microscopy (SECM) techniques. It has been revealed that an intermediate electrochemical oxygen reduction reaction to H 2 O 2 occurred at CNF@Binol ads , which is a key step for the surface-adsorbed Binol-precursor oxidation to redox-active molecular electrocatalyst. CNF@Binol-Redox showed a high-performance reduction reaction at a reduction potential of 0.5 V versus Ag/AgCl (low overpotential, η = 0.5 V), which is much better than that of several conducting polymers and Pd-based electrocatalysts (high η = 1.5−0.6 V) and closer to the performance of a bulk gold electrode system. Further, this new electrode does not show any dissolved oxygen interference or surface-fouling problem. The Andrieux-Savent electrochemical kinetic model was adopted to calculate the heterogeneous rate constant (k chem ) as 4.29 × 10 5 mol −1 •dm 3 •s −1 . As practical applications, a prototype electrochemical Cr(VI) sensor operatable by one-drop analysis and bulk electrochemical detoxification of Cr(VI) to Cr(III) have been successfully demonstrated.

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Section: Resultsmentioning

confidence: 84%

Section: Catalytic Active Sitementioning

confidence: 73%

High-Performance Electrocatalytic Reduction and Sensing of Hazardous Hexavalent Chromium Using a Redox-Active Binol Species-Impregnated Carbon Nanofiber-Modified Electrode

Srinivas

Kumar

2022

J. Phys. Chem. C

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“…8,[34][35][36][37][51][52][53][54][55] Heavy metal contamination of water is a major ecological concern, especially in industrial wastewater, where Cr(VI) is a major pollutant. [56][57][58] As per consensus, it is the second-most prevalent heavy metal contaminant in hazardous waste sites. 59 The mobility of Cr(VI) in water is high, and it is highly toxic, whereas Cr(III) has low mobility, is less toxic, and can create hydroxides that are insoluble.…”

Section: Introductionmentioning

confidence: 99%

“…Heavy metal contamination of water is a major ecological concern, especially in industrial wastewater, where Cr(VI) is a major pollutant 56–58 . As per consensus, it is the second‐most prevalent heavy metal contaminant in hazardous waste sites 59 .…”

Section: Introductionmentioning

confidence: 99%

An efficient and sustainable Pd‐nanomagnetic heterogeneous catalyst for the reduction of nitroarene and environmental pollutant

Yadav¹,

Chavan²

2023

Applied Organom Chemis

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This study reports the synthesis and characterization of an environmentally friendly, cost‐effective, and sustainable Pd‐heterogeneous catalyst anchored on superparamagnetic silica‐coated iron oxide. The synthesized Pd‐SB/MNP nanomagnetic catalyst was extensively characterized using Fourier transform infrared (FTIR), inductively coupled plasma optical emission spectroscopy (ICP‐OES), X‐ray photoelectron spectroscopy (XPS), X‐ray diffraction (XRD), energy‐dispersive spectrometry (EDS), vibrating sample magnetometry (VSM), field emission scanning electron microscopy (FE‐SEM), thermogravimetric analysis (TGA), Brunauer–Emmett–Teller (BET), and high‐resolution transmission electron microscopy (HR‐TEM). The Pd‐SB/MNP catalyst showed remarkable efficiency in catalyzing the reduction of nitroarene and Cr(VI) under mild reaction conditions using an eco‐friendly solvent. The catalyst exhibits facile recovery through external magnetization, enabling its efficient recycling and reutilization for at least 10 cycles while demonstrating minimal Pd loss, as confirmed by rigorous hot filtration testing and ICP‐OES analysis. These results comply with the industry's prescribed thresholds for permissible levels of residual metallic content. The results suggest that the synthesized Pd‐SB/MNP catalyst holds great potential for various industrial applications.

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“…[9][10][11][12] Among all these methods, the chemical reduction of Cr(VI) to trivalent chromium (Cr(III)) in water is widely considered a highly effective approach, as it does not require complex systems, large amounts of organic additives, or additional energy sources (such as electricity, heat, or light) and provides mild and safe reaction conditions. 13,14 The toxicity of chromium is primarily determined by its oxidation state. Cr(VI) is highly soluble in water and extremely toxic, whereas trivalent chromium (Cr(III)) is nontoxic and an essential micronutrient for the metabolism of proteins, glucose, and lipids in humans.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Pd–AuAg trimetal nanohybrids with controlled heterostructures and their application in the continuous flow catalytic reduction of Cr(vi)

et al. 2023

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Polyethylenimine modified ultrafine palladium nanocrystals on reduced graphene oxide for hexavalent chromium reduction

Cited by 14 publications

References 77 publications

High-Performance Electrocatalytic Reduction and Sensing of Hazardous Hexavalent Chromium Using a Redox-Active Binol Species-Impregnated Carbon Nanofiber-Modified Electrode

High-Performance Electrocatalytic Reduction and Sensing of Hazardous Hexavalent Chromium Using a Redox-Active Binol Species-Impregnated Carbon Nanofiber-Modified Electrode

An efficient and sustainable Pd‐nanomagnetic heterogeneous catalyst for the reduction of nitroarene and environmental pollutant

Synthesis of Pd–AuAg trimetal nanohybrids with controlled heterostructures and their application in the continuous flow catalytic reduction of Cr(vi)

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