The excessive production of nitrogen oxides (NO_x) from energy production, agricultural activities, transportation, and other human activities remains a pressing issue in atmospheric environment management. NO_x serves both as a significant pollutant and a potential feedstock for energy carriers. Photocatalytic technology for NO_x removal and recovery has received widespread attention and has experienced rapid development in recent years owing to its environmental friendliness, mild reaction conditions, and high efficiency. This review systematically summarizes the recent advances in photocatalytic removal, encompassing NO_x oxidation removal (including single and synergistic removal and NO₃⁻ decomposition), NO_x reduction to N₂, and the emergent NO_x upcycling into green ammonia. Special focus is given to the molecular understanding of the interfacial nitrogen-associated reaction mechanisms and their regulation pathways. Finally, the status and the challenges of photocatalytic NO_x removal and recovery are critically discussed and future outlooks are proposed for their potential practical application.

中文翻译：

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光催化氮氧化物去除和回收：进展、挑战和未来前景


能源生产、农业活动、交通运输和其他人类活动中氮氧化物（NO _x ）的过量产生仍然是大气环境管理中的一个紧迫问题。 NO _x 既是一种重要的污染物，又是能源载体的潜在原料。光催化脱除和回收NO _x 技术因其环境友好、反应条件温和、效率高等特点，近年来受到广泛关注并得到快速发展。本文系统总结了光催化去除的最新进展，包括NO _x 氧化去除（包括单一和协同去除以及NO ₃ ⁻ 分解）、NO _x 还原为 N ₂ ，并将出现的 NO _x 升级为绿色氨。特别关注界面氮相关反应机制及其调控途径的分子理解。最后，对光催化NO _x 去除和回收的现状和挑战进行了批判性讨论，并对其潜在的实际应用提出了未来的展望。