Molybdenum Dioxide Nanoparticles Anchored on Nitrogen‐Doped Carbon Nanotubes as Oxidative Desulfurization Catalysts: Role of Electron Transfer in Activity and Reusability

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 31(22)

Published: March 21, 2021

Abstract Electron transfer between metal‐oxides and supports considerably affects the oxidative desulfurization (ODS) performance of catalysts, while this is far from being well understood. Herein, molybdenum dioxide with oxygen vacancies (V O ‐MoO 2 ) catalysts derived Mo‐based metal‐organic frameworks are anchored on electron‐rich nitrogen‐doped carbon nanotubes (NC) to obtain excellent ODS activity reusability. Results show that either dibenzothiophene (DBT) or 4,6‐dimethyldibenzothiophene (4,6‐DMDBT) removed 100% composite catalyst @NC) within 40 min reaction when cumene hydroperoxide chosen as an oxidant. After five cycles reaction, DBT 4,6‐DMDBT removal still exceeded 99.5 95.0%, respectively. density functional theory calculations characterizations confirm strong electron‐donating effect NC V can promote dispersion reduce bond energy MoO bond, leading exposure active sites enrichment ). Furthermore, interfacial electrostatic interaction caused by electron leaching catalyst. This study provides a versatile strategy constructing electronic metal‐oxide support via anchoring for design high‐performance catalysts.

Language: Английский

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Construction of multifunctional dual Z-scheme composites with enhanced photocatalytic activities for degradation of ciprofloxacin

Fuel, Journal Year: 2021, Volume and Issue: 294, P. 120399 - 120399

Published: March 11, 2021

Language: Английский

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Electrochemical recovery and high value-added reutilization of heavy metal ions from wastewater: Recent advances and future trends

Environment International, Journal Year: 2021, Volume and Issue: 152, P. 106512 - 106512

Published: March 21, 2021

Wastewater treatment for heavy metals is currently transitioning from pollution remediation towards resource recovery. As a controllable and environment-friendly method, electrochemical technologies have recently gained significant attention. However, there lack of systematic goal oriented summarize metal recovery techniques, which has inhibited the optimized application these methods. This review aims at recent advances in by comparing different methods, attempts to target recycling resources with minimize energy consumption, boost efficiency realize commercial application. In this review, methods (including E-adsorption recovery, E-oxidation E-reduction E-precipitation recovery) recovering are introduced, followed an analysis their corresponding mechanisms, influencing factors, efficiencies. addition, mass transfer can be promoted further through optimizing electrodes reactors, multiple (photo-electrochemical sono-electrochemical) could used synergistically improve Finally, most promising directions discussed along challenges future opportunities technology wastewater.

Language: Английский

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Iron-Based Dual Active Site-Mediated Peroxymonosulfate Activation for the Degradation of Emerging Organic Pollutants

Environmental Science & Technology, Journal Year: 2021, Volume and Issue: 55(22), P. 15412 - 15422

Published: Oct. 26, 2021

It is still a challenge to synthesize highly efficient and stable catalysts for the Fenton-like reaction. In this study, we constructed an integrated catalyst with dispersed iron-based dual active sites, in which Fe2N single-atom Fe (SA-Fe) were embedded into nitrogen- oxygen-co-doped graphitic carbon (Fe-N-O-GC-350). Extended X-ray absorption fine structure (EXAFS) confirmed coordination of iron, line combination fitting (LCF) demonstrated coexistence SA-Fe percentages 75 25%, respectively. Iron-based sites endowed Fe-N-O-GC-350 superior catalytic activity activate peroxymonosulfate (PMS) as evidenced by fast degradation rate sulfamethoxazole (SMX) (0.24 min-1) presence 0.4 mM PMS 0.1 g/L Fe-N-O-GC-350. Unlike reported singlet oxygen high-valent iron oxo-mediated induced catalyst, both surface-bound reactive species contributed SMX degradation, while dominated. Density functional theory (DFT) simulation indicated that enhanced adsorption PMS, played key role activation. The Fe-N-O-GC-350/PMS system had resistance interference common inorganic anions high oxidation capacity recalcitrant organic contaminants. This study elucidated important activation provide clue design rationally emerging pollutants.

Language: Английский

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Evaluation of potassium ferrate activated biochar for the simultaneous adsorption of copper and sulfadiazine: Competitive versus synergistic

Journal of Hazardous Materials, Journal Year: 2021, Volume and Issue: 424, P. 127435 - 127435

Published: Oct. 7, 2021

Language: Английский

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