Differential catalytic mechanism induced by selective adsorption of pollutants in metal clusters decorated single atom catalyst mediated heterogeneous Fenton-like reaction

Journal of Hazardous Materials, Journal Year: 2025, Volume and Issue: unknown, P. 138029 - 138029

Published: March 1, 2025

Although metal clusters are generally considered as impurities accompanying the synthesis of single atom catalysts, their extraordinary potential in regulating catalytic reactions has attracted widespread attention. In this study, iron cluster decorated catalyst (Fe-SACAs) were synthesized to activate peroxymonosulfate (PMS) for removal organic pollutants, and a differential PMS activation mechanism induced by selective adsorption pollutants was observed first time. The chemical coordination between active sites identified dominant chemisorption Fe-SACAs. competitive occupation diversity targeted pollutant molecules ionization potentials thereby revealed be inducement adsorption-dependent oxidation. oxidation fully elucidated using density functional theory (DFT). Finally, an optimized treatment process proposed based on mechanism, which achieved zero oxidant residue emission simultaneously. This study unveils crucial effect reactant mass transfer Fe-SACAs mediated Fenton-like reactions.

Language: Английский

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Production of Graphitic Carbon from Renewable Lignocellulosic Biomass Source

Minerals, Journal Year: 2025, Volume and Issue: 15(3), P. 262 - 262

Published: March 3, 2025

Carbon materials derived from lignocellulosic biomass (LCB) precursors have emerged as sustainable and versatile candidates, exhibiting outstanding properties for energy storage applications. This study presents an innovative cost-efficient approach to produce graphitic carbon LCB precursor (pinecone) using optimized hydrothermal treatment process followed by carbonization graphitization. The developed pinecone-derived (PDGC) was analyzed X-ray diffraction (XRD), transmission electron microscopy (TEM) scanning (SEM). XRD analysis confirmed the formation of a phase, indicated sharp intense (002) peak, decreased interplanar spacing (d002), increased crystallite size (Lc~20.4 nm), high degree graphitization (g~0.7), closely aligning with characteristics pure graphite. Additionally, TEM SEM micrographs revealed flake-like morphology well-defined, continuous, extended layers within PDGC structure. distinctive structural attributes material position it promising candidate batteries capacitors, while also serving model converting into advanced materials.

Language: Английский

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Upcycling CFRP waste for aerospace applications: Recovery of carbon fibers, CNT growth, and composite fabrication

Polymer Composites, Journal Year: 2025, Volume and Issue: unknown

Published: March 8, 2025

Abstract In this study, carbon fiber (CF) was recovered from reinforced polymer (CFRP) composite waste using microwave‐assisted chemical recycling technique, utilizing a combination of acetic acid and hydrogen peroxide in equal proportions. The mechanical properties the (RCF) were successfully improved by growing nanotubes (CNTs) on its surface microwave irradiation (720 W). Ferrocene used as catalyst for CNTs. scanning electron microscopy (SEM) analysis suggested hair‐like dense growth RCF surface. Raman spectral indicated existence D + D', G' peaks decline I /I G values 0.9 CNT‐grown (CNT_RCF) comparison to RCF, confirming CNT growth. subsequently develop composites. CNTs facilitated wettability acted an anchorage point at RCF/epoxy interface, resulting properties. Compared RCFRP composite, characteristics developed composites such interlaminar shear strength (ILSS), ultimate tensile (UTS) fracture toughness (ILFT) (CNT_RCFRP) increased 8%, 29%, 19%, respectively. Highlights CF CFRP MACR technique. grown irradiation. Mechanical upcycled VCF. ILFT CNT_RCFRP enhanced 19% compared RCFRP. contact angle correlated with ILSS UTS

Language: Английский

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Nanogenerators of acid‐functionalized multiwalled carbon nanotubes incorporated poly(vinylidene fluoride) nanocomposites with enhanced piezoelectric performance towards bio‐mechanical motion energy harvesting

Polymer Composites, Journal Year: 2025, Volume and Issue: unknown

Published: March 14, 2025

Abstract Polymer‐based piezoelectric nanocomposites, enhanced with nanofillers, offer a scalable solution for efficient energy harvesting. In this work, we incorporated acid‐functionalized multi‐walled carbon nanotubes (MWCNTs‐COOH) in poly(vinylidene fluoride) (PVDF) matrix to understand the influence of MWCNTs‐COOH enhancing overall structural, morphological, dielectric, and properties PVDF/MWCNTs‐COOH nanocomposites. The nanocomposites were prepared by melt‐mixing followed casting, concentration was varied from 0 3 wt%. served as heterogeneous nucleating agent form polar crystalline polymorph PVDF. incorporation 1.5 wt% led highest phase content ~ 89% owing uniform dispersion PVDF matrix. Similarly, coefficient (d 33 ) 49.2 pm/V observed nanocomposite MWCNTs‐COOH. fabricated optimized nanogenerator exhibited response sensitivity 11.4 V/N an open circuit voltage 59.2 V, current μA, maximum power density 19.8 μW/cm 2 . device found exhibit high durability, which confirmed performing durability test months consecutively. can be used sensor well harvesting various bio‐mechanical motions. Highlights fabricate nanogenerators. Higher extents interfacial interactions performance. Nanocomposite showed 89%. d value pm/V. Nanogenerator utilized motion harvester.

Language: Английский

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Thermally Stable Carbon Materials from Polybenzoxazines: Structure, Properties, and Supercapacitor Potential

Batteries, Journal Year: 2025, Volume and Issue: 11(4), P. 140 - 140

Published: April 4, 2025

This review explores the structural and electrochemical characteristics of carbon materials derived from polybenzoxazines, emphasizing their potential in supercapacitors. A detailed analysis thermal degradation by-products during carbonization reveals distinct competing mechanisms, underscoring exceptional stability benzoxazines. These exhibit significant pseudocapacitive behavior excellent charge retention, making them strong candidates for energy storage applications. The versatility polybenzoxazine-based carbons enables formation diverse morphologies—nanospheres, foams, films, nanofibers, aerogels—each tailored specific functionalities. Advanced synthesis techniques allow precise control over porosity at nanoscale, optimizing performance supercapacitors beyond. Their stability, electrical conductivity, tunable extend utility to gas adsorption, catalysis, electromagnetic shielding. Additionally, intumescent properties (unique ability expand when exposed high heat) make promising flame-retardant coatings. combination customizable architecture, superior performance, resistance highlights transformative sustainable solutions advanced protective

Language: Английский

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Interfacial Characterization and Formation Mechanisms Dominated by Solid-State Diffusion/Reaction in Ni/Single-Crystal 4h-Sic System

Published: Jan. 1, 2025

Language: Английский

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