{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,23]],"date-time":"2026-10-23T21:13:05Z","timestamp":1792789985429,"version":"4.5.0"},"reference-count":77,"publisher":"MDPI AG","issue":"18","license":[{"start":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T00:00:00Z","timestamp":1789603200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"University of Jeddah","award":["UJ-25-DR-2023"],"award-info":[{"award-number":["UJ-25-DR-2023"]}],"id":[{"id":"https:\/\/ror.org\/015ya8798","id-type":"ROR","asserted-by":"crossref"}]},{"award":["UJ-25-DR-2023"],"award-info":[{"award-number":["UJ-25-DR-2023"]}],"id":[{"id":"https:\/\/ror.org\/015ya8798","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Polymers"],"abstract":"<jats:p>Severe heavy metal pollution in aquatic environments demands the engineered development of structurally optimized, highly selective adsorbents. Herein, we report the intentional fabrication of a novel ternary MnO2\/NH2-MIL-101(Fe)\/g-C3N4 nanocomposite via an integrated in situ interfacial growth pathway. The true architectural novelty of this multi-component assembly lies in utilizing the 3D mesoporous metal\u2013organic framework (MOF) scaffolding to structurally isolate the 2D g-C3N4 layers and prevent the self-aggregation of redox-active MnO2 nanoparticles. Comprehensive characterization via PXRD, FTIR, TEM, Raman, and high-resolution XPS confirmed that this unique interfacial hybridization maximizes the spatial exposure of unblocked chemical binding sites. Batch extraction trials demonstrated a high Pb2+ removal efficiency of 99.5 \u00b1 2.7% at an optimized pH of 6.0, yielding a superior maximum monolayer adsorption capacity (qmax) of 431.8 mg.g\u22121. Competitive selectivity matrices containing co-existing ions (Cu2+, Cd2+, Ni2+, and Cr3+) revealed noticeable selectivity toward Pb2+ ions, driven by soft Lewis\u2019s acid-base affinities, while background electrolyte tests identified SO42\u2212 as the most influential competing anion. Non-linear isotherm modeling showed a better agreement with the Langmuir model, suggesting dominant monolayer adsorption on accessible surface sites, while kinetic data followed the pseudo-second-order model. Spectroscopic profiling proved that this heightened performance is dictated by a multi-modal integrated network operating via cooperative inner-sphere Mn-OH complexation, oxygen-vacancy trapping, exocyclic framework amine (-NH2) chelation, and g-C3N4 triazine dative configurations. These findings establish the ternary system as an advanced, highly recyclable benchmark for targeted heavy metal decontamination.<\/jats:p>","DOI":"10.3390\/polym18182277","type":"journal-article","created":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T11:05:53Z","timestamp":1789988753000},"page":"2277","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Enhanced Pb(II) Adsorption by a Ternary MnO2\/NH2-MIL-101(Fe)\/Graphitic Carbon Nitride Nanocomposite Through Complementary Interfacial Interactions"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3911-8025","authenticated-orcid":false,"given":"Faten M. Ali","family":"Zainy","sequence":"first","affiliation":[{"name":"Department of Chemistry, College of Science, University of Jeddah, P.O. Box 80237, Jeddah 21589, Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"funding-acquisition","vocabulary":"credit"},{"role":"data-curation","vocabulary":"credit"},{"role":"validation","vocabulary":"credit"},{"role":"resources","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8944-6989","authenticated-orcid":false,"given":"Amr A.","family":"Yakout","sequence":"additional","affiliation":[{"name":"Department of Chemistry, College of Science, University of Jeddah, P.O. Box 80237, Jeddah 21589, Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"visualization","vocabulary":"credit"},{"role":"supervision","vocabulary":"credit"},{"role":"project-administration","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"},{"role":"data-curation","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"software","vocabulary":"credit"}]}],"member":"1968","published-online":{"date-parts":[[2026,9,17]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"169231","DOI":"10.1016\/j.scitotenv.2023.169231","article-title":"Sewage treatment plant dust: An emerging concern for heavy metals-induced health risks in urban area","volume":"912","author":"Tiwari","year":"2024","journal-title":"Sci. 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