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However, the fabrication of functional porous ionic polymers with custom functionality and porosity for efficient removal of low\u2010concentration SO\n                    <jats:sub>2<\/jats:sub>\n                    remains challenging. Herein, a novel nitrogen\u2010enriched porous ionic polymer NH\n                    <jats:sub>2<\/jats:sub>\n                    Py\u2010PIP is prepared featuring high\u2010content nitrogen sites (15.9\u00a0wt.%), adequate ionic sites (1.22\u00a0mmol\u00a0g\n                    <jats:sup>\u22121<\/jats:sup>\n                    ), and a hierarchical porous structure. The proposed construction pathway relies on a tailored nitrogen\u2010functionalized cross\u2010linker NH\n                    <jats:sub>2<\/jats:sub>\n                    Py, which effectively introduces abundant functional sites and improves the porosity of porous ionic polymers. NH\n                    <jats:sub>2<\/jats:sub>\n                    Py\u2010PIP with a well\u2010engineered SO\n                    <jats:sub>2<\/jats:sub>\n                    \u2010affinity environment achieves excellent SO\n                    <jats:sub>2<\/jats:sub>\n                    \/CO\n                    <jats:sub>2<\/jats:sub>\n                    selectivity (1165) and high SO\n                    <jats:sub>2<\/jats:sub>\n                    adsorption capacity (1.13\u00a0mmol\u00a0g\n                    <jats:sup>\u22121<\/jats:sup>\n                    at 0.002\u00a0bar), as well as enables highly efficient and reversible dynamic separation performance. Modeling studies further elucidate that the nitrogen sites and bromide anions collaboratively promote preferential adsorption of SO\n                    <jats:sub>2<\/jats:sub>\n                    . The unique design in this work provides new insights into constructing functional porous ionic polymers for high\u2010efficiency separations.\n                  <\/jats:p>","DOI":"10.1002\/smll.202400746","type":"journal-article","created":{"date-parts":[[2024,4,28]],"date-time":"2024-04-28T10:51:17Z","timestamp":1714301477000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Precise Construction of Nitrogen\u2010Enriched Porous Ionic Polymers as Highly Efficient Sulfur Dioxide Adsorbent"],"prefix":"10.1002","volume":"20","author":[{"given":"Sen","family":"Chen","sequence":"first","affiliation":[{"name":"Engineering Research Center of Functional Materials Intelligent Manufacturing of Zhejiang Province Department of Chemical and Biological Engineering Zhejiang University  Hangzhou 310012 China"},{"name":"ZJU\u2010Hangzhou Global Scientific and Technological Innovation Center  Hangzhou 311215 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