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Herein, this work investigated the sorption and separation of Fe\n                    <jats:sup>3+<\/jats:sup>\n                    and Mn\n                    <jats:sup>2+<\/jats:sup>\n                    from both aquatic solution and REEs of monazite liquor using carbon-based on lignocellulosic cotton stalk material (CCS) as a green biosorbent at optimum conditions. The prepared CCS was characterized by different physicochemical and morphological techniques as FTIR, SEM, TEM, and specific surface area measurement, which was 831 m\n                    <jats:sup>2<\/jats:sup>\n                    g\n                    <jats:sup>\u2212\u20091<\/jats:sup>\n                    with total pore volume; 0.431 m\n                    <jats:sup>3<\/jats:sup>\n                    g\n                    <jats:sup>\u2212\u20091<\/jats:sup>\n                    , micro-pores percentage; 93.27%, and meso-pores percentage; 6.73%. The sorption investigations like pH, stirring time, initial metal-ions concentration, temperature, and adsorbent weight were carried out to identify the best reaction parameters. The obtained results were analyzed using different kinetic and isotherm patterns. The pseudo-second order kinetic model surpasses on the other kinetic models in the sorption process, indicating the chemisorption reaction. The sorption isotherm matched with Langmuir model, depending on the highest R\n                    <jats:sup>2<\/jats:sup>\n                    and lowest of error functions. The maximum monolayer sorption capacities of Fe\n                    <jats:sup>3+<\/jats:sup>\n                    and Mn\n                    <jats:sup>2+<\/jats:sup>\n                    ions onto CCS are 531.9 and 680.27\u00a0mg\/g, respectively at optimum sorption conditions (pH 2.6 for Fe\n                    <jats:sup>3+<\/jats:sup>\n                    and pH 5.5 for Mn\n                    <jats:sup>2+<\/jats:sup>\n                    , stirring time 30\u00a0min. at 25\u00a0\u00b0C). The sorption approach was exothermic, randomness and spontaneous in nature. Lastly, CCS can be highly separated Fe\n                    <jats:sup>3+<\/jats:sup>\n                    and Mn\n                    <jats:sup>2+<\/jats:sup>\n                    from REEs of monazite leachate with separation factors reached 228.947 and 2.5735, respectively. Consequently, the low-cost CCS sorbent was utilized for purification of REEs from Fe\n                    <jats:sup>3+<\/jats:sup>\n                    and Mn\n                    <jats:sup>2+<\/jats:sup>\n                    pollutants of monazite ore liquor.\n                  <\/jats:p>","DOI":"10.1038\/s41598-026-52221-3","type":"journal-article","created":{"date-parts":[[2026,7,2]],"date-time":"2026-07-02T16:02:34Z","timestamp":1783008154000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Performance assessment of carbon based on lignocellulosic material as an effective biosorbent for elimination of iron and manganese from monazite leachate"],"prefix":"10.1038","volume":"16","author":[{"given":"G. E.","family":"Sharaf El-Deen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"B. 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