通过同时控制N-H键和氧的激活，增强了Ag/WO3上光催化氨氧化

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology Pub Date : 2025-05-08 DOI:10.1016/j.seppur.2025.133428

Kunfeng Zhang , Hongxia Chen , Yifan Liu , Bo Peng , Jinxia Liang

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引用次数: 0

摘要

光催化NH3转化为N2和H2O是一种很有前途的NH3减排技术。本文合成了WO3和Ag修饰的单斜WO3 （Ag/m-WO3）的不同晶相（六方、单斜和混合晶相）用于光催化氧化NH3。晶体相变和欧姆接触的形成加速了电荷的分离和转移，Ag和WO3的局部表面等离子体共振（LSPR）效应增强了光收集能力。Ag/m-WO3表现出最好的光催化氧化NH3活性，其反应速率分别是m-WO3和六方WO3 （h-WO3）的1.5倍和4.4倍。更重要的是，缺氧WO3的光致电子可以激活化学吸附的氧产生超氧自由基（O2−），而不受热力学限制，从而抑制不良副产物的产生，从而产生高的N2选择性。这项工作同时调节了N-H键的激活和NH3氧化O2−的生成，有助于设计用于污染物处理的高效光催化剂。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Enhanced photocatalytic ammonia oxidation over Ag/WO3 via simultaneously steering the activation for N–H bonds and oxygen species

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Enhanced photocatalytic ammonia oxidation over Ag/WO3 via simultaneously steering the activation for N–H bonds and oxygen species

Photocatalytic conversion of NH₃ into N₂ and H₂O is a promising technology for NH₃ abatement. Herein, different crystal phases (hexagonal, monoclinic, and mixed crystal phases) of WO₃ and Ag modified monoclinic WO₃ (Ag/m-WO₃) were synthesized for the photocatalytic oxidation of NH₃. The crystal-phase transition and formation of ohmic contact accelerated charge separation and transfer, and the localized surface plasmon resonance (LSPR) effects of Ag and WO₃ enhanced light harvesting capacity. Accordingly, Ag/m-WO₃ exhibited the best photocatalytic NH₃ oxidation activity, and its reaction rate was 1.5 and 4.4 times higher than that of m-WO₃ and hexagonal WO₃ (h-WO₃), respectively. More importantly, the photoinduced electrons of oxygen-deficient WO₃ could activate chemisorbed oxygen to produce superoxide radicals (•O₂⁻) without thermodynamic limitation, thus inhibiting the generation of undesirable byproducts and resulting in high N₂ selectivity. This work simultaneously regulates the activation of N–H bonds and the generation of •O₂⁻ for NH₃ oxidation, contributing to the design of highly efficient photocatalysts for pollutant treatment.

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来源期刊

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.