Photocatalytic oxidation of high concentration NO over SnS2/g-C3N4: A mechanistic study

Q3 Energy 燃料化学学报 Pub Date : 2025-03-01 DOI:10.1016/S1872-5813(24)60510-4

Haocun WANG , Qixin ZHANG , Yifan YANG, Junjie BIAN, Chunhu LI

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Abstract

This study aims to enhance the photocatalytic performance of 2D/2D heterojunctions for NO removal from marine vessel effluents. SnS₂/g-C₃N₄ composites were successfully constructed via a facile solvothermal method, demonstrating a significant improvement in photocatalytic NO removal under visible light irradiation. For high-flux simulated flue gas, the composite with 10% SnS₂ (denoted as SNCN-10) showed exceptional NO removal efficiency, reaching up to 66.8%, along with excellent reusability over five consecutive cycles. Detailed band structure and density of states (DOS) calculations confirmed the formation of a characteristic heterojunction. Spin-trapping ESR spectroscopy identified ·O− 2 as the key reactive species driving NO oxidation. Additionally, in situ DRIFT spectroscopy revealed that SNCN-10 facilitated the conversion of NO to nitrate through intermediate species, including bridging nitrite and cis-nitrite (N₂O2− 2). Kinetic studies further indicated that NO oxidation followed the Langmuir-Hinshelwood (L-H) mechanism. Based on density functional theory (DFT) calculations of free energy changes, a comprehensive reaction pathway for NO oxidation was proposed. These findings provide valuable insights for the development of efficient photocatalytic strategies for NO removal.

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来源期刊

燃料化学学报 Chemical Engineering-Chemical Engineering (all)

CiteScore

2.80

自引率

0.00%

发文量

5825

期刊介绍： Journal of Fuel Chemistry and Technology (Ranliao Huaxue Xuebao) is a Chinese Academy of Sciences(CAS) journal started in 1956, sponsored by the Chinese Chemical Society and the Institute of Coal Chemistry, Chinese Academy of Sciences(CAS). The journal is published bimonthly by Science Press in China and widely distributed in about 20 countries. Journal of Fuel Chemistry and Technology publishes reports of both basic and applied research in the chemistry and chemical engineering of many energy sources, including that involved in the nature, processing and utilization of coal, petroleum, oil shale, natural gas, biomass and synfuels, as well as related subjects of increasing interest such as C1 chemistry, pollutions control and new catalytic materials. Types of publications include original research articles, short communications, research notes and reviews. Both domestic and international contributors are welcome. Manuscripts written in Chinese or English will be accepted. Additional English titles, abstracts and key words should be included in Chinese manuscripts. All manuscripts are subject to critical review by the editorial committee, which is composed of about 10 foreign and 50 Chinese experts in fuel science. Journal of Fuel Chemistry and Technology has been a source of primary research work in fuel chemistry as a Chinese core scientific periodical.