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CDs emitted a strong green fluorescence under UV light. The prepared CDs were characterized using TEM, XRD, XPS, FTIR, UV\u2013Vis, and fluorescence techniques. Maximum emission intensity of CDs was recorded at 438\u2009nm on excitation at 350\u2009nm. The quantum yield of CDs was 4.4%. CDs selectively detected Fe<jats:sup>3+<\/jats:sup> ions colorimetrically through a visual change in color from colorless to yellow. Also, among other metal ions, only Fe<jats:sup>3+<\/jats:sup> selectively quenched the emission of CDs. Fluorescence quenching by Fe<jats:sup>3+<\/jats:sup> was static in nature and due to the formation of a ground state complex between the metal ion and the surface functionalities on CDs. From the spectroscopic data, it was concluded that CDs can detect Fe<jats:sup>3+<\/jats:sup> within the linear range of 6.2\u2013620\u2009\u03bcM, and the limit of detection was 1.11\u2009\u03bcM. Based on rapid, label\u2010free, and selective detection capabilities, CDs were further used in the analysis of Fe<jats:sup>3+<\/jats:sup> in real water samples.<\/jats:p>","DOI":"10.1002\/bio.70260","type":"journal-article","created":{"date-parts":[[2025,7,19]],"date-time":"2025-07-19T10:00:23Z","timestamp":1752919223000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["<scp><i>Citrus reticulata<\/i><\/scp> Derived Carbon Dots for Selective Fluorimetric Sensing of Fe<sup>3+<\/sup> in Water for Environmental Monitoring"],"prefix":"10.1002","volume":"40","author":[{"family":"Sushma","sequence":"first","affiliation":[{"name":"Department of Chemistry National Institute of Technology Hamirpur  Hamirpur Himachal Pradesh India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joy","family":"Debnath","sequence":"additional","affiliation":[{"name":"Department of Chemistry, School of Chemical and 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