The release of nitrogen dioxide (NO) into the atmosphere significantly contributes to air pollution, posing threats to both the environment and human health. Selective adsorption technologies have gained attention for their potential to mitigate NO emissions under ambient conditions. However, certain solid adsorbents lack accessible active basic sites, a crucial requirement for high NO adsorption capacities due to the acidic nature of NO. Metal-based layered double oxides (LDOs), derived from layered double hydroxides (LDHs), show promise for ambient NO adsorption due to their layered structures, strong basic properties, and adjustable adsorption affinity. In this study, we synthesized a series of M-Al-LDO/A (M = Ni, Co, and Mg) using a facile aqueous miscible organic solvent treatment (AMOST) method. The newly synthesized M-Al-LDO/A exhibited a 2D nano flower-like morphology with expanded surface area, increased pore volume, and enhanced accessible basic sites. Dynamic breakthrough experiments demonstrated the exceptional NO adsorption capacity of Mg-Al-LDO/A (4.67 mmol g) under ambient conditions, surpassing Mg-Al-LDO/CP (0.13 mmol g) synthesized from the conventional method by more than 35 times. Temperature-programmed desorption (TPD) results and spectroscopic analyses revealed that the improved NO capacity of Mg-Al-LDO/A resulted from the highly dispersed and increased basic sites (Mg-O). These findings hold promise for advancing efficient and environmentally friendly NO adsorption materials, critical for addressing the challenges posed by NO-induced air pollution and safeguarding air quality.

中文翻译：

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工程设计二维镁铝层状双氧化物，具有高度分散和增强的碱性位点，可有效反应去除环境中的 NO2

二氧化氮（NO）释放到大气中会严重加剧空气污染，对环境和人类健康构成威胁。选择性吸附技术因其在环境条件下减少 NO 排放的潜力而受到关注。然而，某些固体吸附剂缺乏可接近的活性碱性位点，而由于 NO 的酸性性质，这是高 NO 吸附能力的关键要求。源自层状双氢氧化物 (LDH) 的金属基层状双氧化物 (LDO) 由于其层状结构、强碱性和可调节的吸附亲和力，在环境 NO 吸附方面表现出良好的前景。在本研究中，我们使用简便的水相混溶有机溶剂处理 (AMOST) 方法合成了一系列 M-Al-LDO/A（M = Ni、Co 和 Mg）。新合成的M-Al-LDO/A表现出二维纳米花状形貌，表面积扩大，孔体积增加，可及的碱性位点增强。动态突破实验表明，Mg-Al-LDO/A (4.67 mmol g) 在环境条件下具有优异的 NO 吸附能力，超过传统方法合成的 Mg-Al-LDO/CP (0.13 mmol g) 35 倍以上。程序升温脱附（TPD）结果和光谱分析表明，Mg-Al-LDO/A 的 NO 容量提高是由于高度分散和增加的碱性位点（Mg-O）所致。这些发现有望推动高效、环保的二氧化氮吸附材料的发展，对于解决二氧化氮引起的空气污染和保障空气质量至关重要。