Adsorptive removal of trace SO₂ emissions from flue-gases can significantly reduce energy and water consumption and minimize the amount of unmanageable waste, however, this remains a great challenge. Herein, we report a universal strategy of chemical immobilization of amino acids into a robust metal–organic framework to enhance deep desulfurization. The grafted amino acid resulted in the formation of pores with compatible pore sizes and created abundant N-containing moieties for selective SO₂ adsorption. MOF-808-His (His = l-histidine) exhibited a top-ranking SO₂ uptake (10.4 mmol g⁻¹) with an excellent SO₂/CO₂ selectivity (90.5) under ambient conditions; furthermore, MOF-808-His could be easily regenerated. Breakthrough curves verified its excellent separation performances with water vapor and real flue-gas compositions. Computational simulations confirmed the vital role of immobilized amino acids in improving the SO₂ capture ability and selectivity. As a proof-of-concept, five natural amino acids were immobilized into MOF-808; all samples displayed improved adsorptive desulfurization performances.

中文翻译：

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将氨基酸化学固定到坚固的金属有机框架中以有效去除 SO2

从烟道气中吸附去除痕量 SO ₂排放可以显着降低能源和水的消耗，并最大限度地减少无法管理的废物量，但这仍然是一个巨大的挑战。在此，我们报告了一种将氨基酸化学固定到坚固的金属-有机框架中以增强深度脱硫的通用策略。接枝的氨基酸导致形成具有兼容孔径的孔，并为选择性 SO ₂吸附创造了丰富的含氮部分。MOF-808-His (His =  l-组氨酸) 表现出一流的 SO ₂吸收 (10.4 mmol g ^-1 ) 和优异的 SO ₂ /CO ₂环境条件下的选择性 (90.5)；此外，MOF-808-His 可以很容易地再生。突破曲线验证了其对水蒸气和真实烟气成分的出色分离性能。计算模拟证实了固定化氨基酸在提高 SO ₂捕获能力和选择性方面的重要作用。作为概念验证，将五种天然氨基酸固定在 MOF-808 中；所有样品都显示出改进的吸附脱硫性能。