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However, the prevention of iron sites from deactivation remains a big challenge. Herein, a facile copolymerization strategy is proposed for the construction of isolated Fe sites confined in polymeric carbon nitride (CN) (Fe\u2010CNN\u03c7). The as\u2010prepared Fe\u2010CNN\u03c7 catalysts possess unique 2D structure as well as electronic property, resulting in enlarged exposure of active sites and enhancement of redox performance. Combining systematic characterizations with density functional theory calculation, it\u00a0is disclosed that the isolated Fe atoms prefer to occupy four\u2010coordinate doping configurations (Fe\u2013N<jats:sub>4<\/jats:sub>). Such Fe\u2013N<jats:sub>4<\/jats:sub> centers favor the adsorption and activation of O<jats:sub>2<\/jats:sub> and H<jats:sub>2<\/jats:sub>S. As a consequence, Fe\u2010CNN\u03c7 exhibit excellent catalytic activity for the catalytic oxidation of H<jats:sub>2<\/jats:sub>S to S. More importantly, the Fe\u2010CNN\u03c7 catalysts are resistant to water and sulfur poisoning, exhibiting outstanding catalytic stability (over 270 h of continuous operation), better than most of the reported catalysts.<\/jats:p>","DOI":"10.1002\/smll.202003904","type":"journal-article","created":{"date-parts":[[2020,9,30]],"date-time":"2020-09-30T06:42:13Z","timestamp":1601448133000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":61,"title":["Highly Active and Sulfur\u2010Resistant Fe\u2013N<sub>4<\/sub> Sites in Porous Carbon Nitride for the Oxidation of H<sub>2<\/sub>S into Elemental Sulfur"],"prefix":"10.1002","volume":"16","author":[{"given":"Ganchang","family":"Lei","sequence":"first","affiliation":[{"name":"National Engineering Research Center of Chemical Fertilizer Catalyst School of Chemical Engineering Fuzhou University  Fuzhou Fujian 350116 P. R. 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