A green and easy way for carbon microspheres synthesis impregnated with palladium for hexavalent chromium reduction

Gámez, Sebastián; Lozada, Ana Belén; Guevara, Alicia; Torre, Ernesto de la

doi:10.1016/j.jece.2019.103467

Cited by 6 publications

(2 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

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

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 84%

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

View full text Add to dashboard Cite

show abstract

“…[19][20][21] Among them, carbon microspheres have been widely concerned due to its perfect spherical structure and excellent lubrication characteristics. [22][23][24][25] St. Dennis et al [26] studied the frictionreduction and antiwear properties of water-based carbon microsphere with the pore diameter of about 450 nm. The results showed that the friction coefficient of the water-based lubricant on the glass substrate can reach as low as 0.03, and the wear rate was also significantly reduced.…”

Section: Introductionmentioning

confidence: 99%

Effects of Humidity on Tribological Properties of 8YSZ/C Coating Designed by the Combination of Thermal Spraying and Hydrothermal Reaction

Deng,

Zhang,

Guo

et al. 2023

Adv Eng Mater

View full text Add to dashboard Cite

Thermal spraying ceramic coatings have been widely used to prevent wear damage. However, the poor lubricating ability seriously restricted their application. In this paper, zirconia stabilized by 8 wt% yttria (8YSZ)‐C composite coating is prepared with the combination of in‐situ synthesis carbon microspheres in the pores of as‐sprayed 8YSZ coating by hydrothermal reaction. The chemical constituents and morphologies of the synthesized powders and the composite coatings are analyzed by SEM and XRD. The microstructure and tribological behaviors of the composite coating are studied by SEM, TEM and Raman analysis. The influence of humidity on the structural evolution of carbon microspheres during sliding wear process is discussed. The results show that the synthetic C powders exhibit a typical spherical structure. Meanwhile, carbon microspheres adhere to the pores of the 8YSZ coating. The friction and wear experiments in different humidity show that the re‐graphitization of amorphous carbon becomes extremely obvious with the increase of humidity. Under the 80% humidity, an ordered graphene nanoscroll structure is formed, resulting in the optimization of the tribological properties. Furthermore, the friction coefficient of composite coating is reduced to 0.18, and its wear rate is about 1 times lower than that of under the 10% humidity.This article is protected by copyright. All rights reserved.

show abstract

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

Yin

Hao

Yang

et al. 2021

Applied Surface Science

View full text Add to dashboard Cite

A green and easy way for carbon microspheres synthesis impregnated with palladium for hexavalent chromium reduction

Cited by 6 publications

References 41 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

Effects of Humidity on Tribological Properties of 8YSZ/C Coating Designed by the Combination of Thermal Spraying and Hydrothermal Reaction

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

Contact Info

Product

Resources

About