Mesoporous carbon confined palladium–copper alloy composites for high performance nitrogen selective nitrate reduction electrocatalysis

Fan, Jianwei; Xu, Huawei; Lv, Menghua; Wang, Jinxiu; Teng, Wei; Ran, Xianqiang; Gou, Xiao; Wang, Xiaomin; Sun, Yu; Yang, Jianping

doi:10.1039/c6nj03994d

Cited by 46 publications

(27 citation statements)

References 44 publications

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“…[82] Fan et al prepared a mesoporous carbon confined palladiumcopper alloy composite for high-performance selective nitrate reduction. [83] Mesoporous silica SBA-15 was used as the hard template and PdCu nanoparticles are uniformly loaded in the OMC to form a PdCu@OMC framework. A nitrate conversion yield of 28.7% and a nitrogen selectivity of 74% was achieved by 1%PdCu@OMC (mass ratio of Pd/Cu/carbon = 1/0.5/100).…”

Section: Catalyst Materialsmentioning

confidence: 99%

Restoring the Nitrogen Cycle by Electrochemical Reduction of Nitrate: Progress and Prospects

et al. 2020

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The increasing amount of anthropogenic nitrogen has resulted in alarming levels of nitrate in bodies of water and caused a cascade of damage to the environment and human health. Electrochemical nitrate reduction is an efficient strategy ancillary to biological nitrogen cycle management, which utilizes electrons as green reductants and rebalances the N 2 cycle. In this review, the fundamental principles and implementation of electrochemical nitrate reduction are described to lay the foundation for the eventual large-scale application in the remediation of nitrate-laden wastewaters. Factors that influence the activity and selectivity of electrochemical nitrate reduction are also discussed. Moreover, electrolytic cell design and construction are discussed via a rational choice of critical components and assembly. Finally, a roadmap for the development of highly selective nitrate reduction catalysts is proposed. This review attempts to provide a practical strategy for electrochemical nitrogen cycle management and aims to stimulate future research for final implementation.

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Section: Catalyst Materialsmentioning

confidence: 99%

Restoring the Nitrogen Cycle by Electrochemical Reduction of Nitrate: Progress and Prospects

et al. 2020

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“…Among the large available transition metal possibilities, copper (Cu) and palladium (Pd) have been selected due to their potential scientific and industrial applications. Copper displays a remarkable electrical conductivity, high‐thermal conductivity, pseudocapacitive characteristics, good corrosion resistance, no toxicity and cost effectiveness 25 while palladium has a high selectivity and reactivity in many catalytic reactions and enables unique transformations that cannot be readily achieved using other materials 26–28 . It is our hypothesis that the in situ created copper and palladium oxide nanoparticles in highly porous cellulosic aerogels may provide functional materials with application potentials in the fields of catalysis, gas capture/sensing, electronics or thermal management.…”

Section: Introductionmentioning

confidence: 99%

Effect of metal‐oxide nanoparticle presence and alginate cross‐linking on cellulose nanocrystal‐based aerogels

Goikuria

Larrañaga

Lizundia

et al. 2021

J of Applied Polymer Sci

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In a context where environmentally friendly materials development is becoming essential, cellulose is achieving a great importance. Cellulose nanocrystal (CNC) hierarchical and nanostructured porous network is a versatile nanoparticle support to fabricate nanocomposites for different solutions. In this work, CNC‐based aerogels loaded with copper and palladium‐oxide nanoparticles have been synthesized by nitrate precursor reduction followed by freeze‐drying, after a scalable, surfactantless and room temperature process. The in situ produced nanoparticles are entrapped by CNC due to ionic interactions and aerogels show an uniformly colored macroscopic appearance. Metal oxide nanoparticle (MOx) mediated hybridization promotes remarkable changes in CNC wettability, free surface energy and thermal stability. These modifications are dependent on the type of metal precursor and concentration and have been analyzed by different techniques. Overall, obtained CNC hybrid aerogels are lightweight (12–30 mg.cm−3) and highly porous (98%–99%). Finally, more mechanically resistant hybrid aerogels have been synthesized through the incorporation of sodium alginate and tested by compressive stress measurements.

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“…The electrode materials used in 2D systems usually include monometallic (Cu, Ni, Al, Pd, Pt, Pb, Ti, and Rh [12][13][14]) and bimetallic (Cu-Ni, Cu-Sn, Sn-Pd, Cu-Pd, and Cu-Zn [15][16][17][18]) catalytic electrodes. For 3D systems, the particle electrodes are composed of a carrier material loaded with a catalyst, such as Co 3 O 4 -TiO 2 /Ti, PdCu@OMC (OMC: ordered mesoporous carbon), Pd-Sn/AC, Cu/AC or Co/AC 0.9 -AB 0.1 (AC: active carbon, AB: acetylene black) [9,[19][20][21][22]. Compared to the 2D system, the addition of particle electrodes results in an increased specific surface area and availability of reactive sites, while also shortening the mass transfer distance, which enhances the removal efficiency and reaction rate [7,23].…”

Section: Introductionmentioning

confidence: 99%

Removal of Ammonia Using Persulfate during the Nitrate Electro-Reduction Process

Yang

You

et al. 2022

IJERPH

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NH4+ is often produced during the electro-reduction of NO3−, which results in inadequate total nitrogen (TN) removal during advanced sewage treatment. In this study, the electro-reduction byproduct NH4+ was oxidized and removed using sulfate radical (SO4•−)-based advanced oxidation. Persulfate (PS) was activated by electrocatalysis, using Co/AC0.9-AB0.1 particle electrodes to produce SO4•−. Results showed that when the influent concentration of NO3−-N was 20 mg/L, a PS dosage of 5.0 mM could completely oxidize NH4+ at 0.1 A (nondetectable in effluent) reducing the TN concentration from 9.22 to 0.55 mg/L. The presence of coexisting PO43−, CO32− and humic acid suppressed the oxidation and removal of NH4+. Electron spin resonance (ESR) spectra and quenching experiments revealed SO4•− as the dominant radical in the process of indirect NH4+ oxidation, while •OH radicals only had an assisting role, and the surface accumulated free radicals were responsible for the indirect oxidation of NH4+. Cyclic voltammetry (CV) curves indicated that NO3− was primarily reduced via atomic H*-mediated indirect reduction. Therefore, the activation of PS using Co/AC0.9-AB0.1 particle electrodes might be a promising alternative method for oxidizing byproduct NH4+ in the electro-reduction of NO3− and reduce TN concentration in advanced sewage treatment.

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Mesoporous carbon confined palladium–copper alloy composites for high performance nitrogen selective nitrate reduction electrocatalysis

Abstract: A mesoporous carbon confined PdCu bimetallic electrocatalyst is fabricated, which delivers a superior nitrate conversion yield and nitrogen selectivity.

Cited by 46 publications

References 44 publications

Restoring the Nitrogen Cycle by Electrochemical Reduction of Nitrate: Progress and Prospects

Restoring the Nitrogen Cycle by Electrochemical Reduction of Nitrate: Progress and Prospects

Effect of metal‐oxide nanoparticle presence and alginate cross‐linking on cellulose nanocrystal‐based aerogels

Removal of Ammonia Using Persulfate during the Nitrate Electro-Reduction Process

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