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Pb<jats:sup>2+<\/jats:sup> in fly ash is the ion most likely to exceed permissible levels. However, chemical stabilization methods demonstrate poor efficacy in stabilizing Pb<jats:sup>2+<\/jats:sup> under acidic conditions. Herein, we have developed a robust acid-resistant chelating polymer (25DTF) for enhanced stabilization of Pb<jats:sup>2+<\/jats:sup> in fly ash. 25DTF was synthesized through the reaction of formaldehyde with 2,5-dithiourea. 25DTF exhibited remarkable chelation efficiency, nearing 100%, for Pb<jats:sup>2+<\/jats:sup> in fly ash. 25DTF demonstrated exceptional chelation efficiency, surpassing 99.9%, when interacting with Pb<jats:sup>2+<\/jats:sup> in fly ash at pH\u2009\u2264\u20097. Even under acidic conditions, 25DTF effectively prevented the secondary dissolution of Pb<jats:sup>2+<\/jats:sup>. Additionally, it indicated outstanding Pb<jats:sup>2+<\/jats:sup> chelation efficiency across diverse regions of China. The 25DTF chelating agent shows considerable potential in alleviating metal ion contamination in soil, wastewater, and urban environmental management, thereby fostering advancements in environmental stewardship.<\/jats:p>","DOI":"10.1186\/s13065-024-01209-z","type":"journal-article","created":{"date-parts":[[2024,5,23]],"date-time":"2024-05-23T13:02:26Z","timestamp":1716469346000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["A robust acid-resistant chelating polymer for enhanced stabilization of lead ions in fly ash"],"prefix":"10.1186","volume":"18","author":[{"given":"Qi","family":"Wang","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Huiyu","family":"Yan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Linyan","family":"Yao","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ying","family":"Guo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jianxi","family":"Xiao","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2024,5,23]]},"reference":[{"key":"1209_CR1","doi-asserted-by":"publisher","first-page":"7757","DOI":"10.1007\/s11356-020-07933-y","volume":"27","author":"S Wong","year":"2020","unstructured":"Wong S, Mah AXY, Nordin AH, et al. 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