Coupling Nitrate‐to‐Ammonia Conversion and Sulfion Oxidation Reaction Over Hierarchical Porous Spinel MFe₂O₄ (M═Ni, Co, Fe, Mn) in Wastewater

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 7, 2025

The construction of coupled electrolysis systems utilizing renewable energy sources for electrocatalytic nitrate reduction and sulfion oxidation reactions (NO3RR SOR), is considered a promising approach environmental remediation, ammonia production, sulfur recovery. Here, simple chemical dealloying method reported to fabricate hierarchical porous multi-metallic spinel MFe2O4 (M═Ni, Co, Fe, Mn) dual-functional electrocatalysts consisting Mn-doped NiFe2O4/CoFe2O4 heterostructure networks Ni/Co/Mn co-doped Fe3O4 nanosheet networks. excellent NO3RR with high NH3 Faradaic efficiency 95.2% at -0.80 V versus reversible hydrogen electrode (vs RHE) yield rate 608.9 µmol h-1 cm-2 -1.60 vs RHE, impressive SOR performance (100 mA [email protected] achieved MFe2O4. Key intermediates such as *NO, *NH2, are identified in the process by situ Fourier transform infrared spectroscopy (in FTIR). MFe2O4-assembled two-electrode coupling system (NO3RR||SOR) shows an ultra-low cell voltage 1.14 10 cm-2, much lower than NO3RR||OER (oxygen evolution reaction, [email protected] V), simultaneously achieving two expected targets value-added generation recovery, also demonstrating durability 18 h. This work demonstrates great potential ferrite-based catalysts remediation.

Language: Английский

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Pt@ZnCo2O4 Microspheres as Peroxidase Mimics: Enhanced Catalytic Activity and Application for L-Cysteine Detection

Molecules, Journal Year: 2025, Volume and Issue: 30(1), P. 187 - 187

Published: Jan. 5, 2025

Compared to natural enzymes, the development of efficient artificial simulated such as those based on bimetallic materials with high catalytic activity and good stability, is an important way until now. Herein, we employed ZnCo2O4 microspheres carriers synthesize Pt-doped composites different amounts using a one-pot method. The morphology structure synthesized were characterized XRD, SEM, BET, FT-IR, XPS, Zeta potential techniques. It was found that Pt0 adhered well surface microspheres, 12.5% Pt doped ratio exhibiting abundant oxygen vacancies, excellent substrate affinity, peroxidase-like activity. Using fluorescent probes electrochemical methods, mechanism has been explored Pt@ZnCo2O4 can accelerate electron transfer between H2O2 3,3',5,5'-tetramethylbenzidine (TMB). Based optimal loading Pt@ZnCo2O4, colorimetric sensor for visual detection L-cysteine (L-Cys) constructed, wide linear range 0.1~50 µM low limit 0.0163 µM. possesses selectivity, reusability, usage which be applied determination L-Cys in health product capsules recovery rates 96.9%~103.7% RSD 1.07%~6.50%. This work broadens application prospects spinel field biological analysis also provides inspiration new enzymes.

Language: Английский

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Sulfur Defect Tuning of CuS/BiVO₄ and Understanding the Function of Hydrogen Radicals for Photoelectrochemical Ammonia Production

Inorganic Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 21, 2025

Photoelectrochemical nitrate reduction has been a promising method for ammonia (NH3) production under normal temperatures and neutral conditions. However, hydrogenation is key process in the selective of NH3 during reduction; therefore, inducing active hydrogen inhibiting are noteworthy problem. In this study, BiVO4/CuS (BVO/CS) heterostructure constructed photoelectrochemical reaction (PEC NIRR). The introduction CuS optimizes electron-transfer ability enhances surface catalytic kinetics BVO/CS. At same time, presence sulfur vacancies on promotes adsorption activation nitrate, realizes splitting H2O, successfully generates abundant radicals (H*). generated H* effectively utilized NIRR. yield selectivity optimal BVO/CS reach 30.55 μg h-1 cm-2 43.8%, respectively, which 2.65 2.39 times that bare BVO. Therefore, work determines role hydrogenation, providing novel strategy boosting PEC CuS/BiVO4 was fabricated reduction. Sulfur defects enabled generation radicals, promoted production.

Language: Английский

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Novel conversion of polyethylene terephthalate into aromatic amines production through nitrogen-rich pyrolysis using Zn/CuCo₂O₄ spinel catalyst

Process Safety and Environmental Protection, Journal Year: 2025, Volume and Issue: unknown, P. 107237 - 107237

Published: April 1, 2025

Language: Английский

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