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Biochar-reinforced natural rubber latex foam (NRLF) composites were fabricated via the Dunlop process as structured, particle-retaining adsorbents for multicomponent nutrient removal. Among formulations tested (0\u20138 phr biochar), the NR\u2013B2 composite (2 phr biochar) achieved the most balanced simultaneous removal under optimal conditions (pH 7, 10 g\u00b7L\u20131, 28 \u00b0C), with PO43\u2013 removal reaching 92.58%. The pH-responsive, charge-switchable surface (pHpzc = 7.3) enabled concurrent cationic and anionic uptake within a single monolithic framework. Model fitting revealed maximum adsorption capacities (qm) of 5.50, 20.62, 1.27, and 0.03 mg\u00b7g\u20131 for NH4+, PO43\u2013, NO3\u2013, and NO2\u2013, respectively. Equilibrium was reached between 4 and 12 h depending on the specific ion. NH4+ followed pseudo-first-order kinetics and Langmuir isotherm behavior, while anionic species conformed to pseudo-second-order kinetics and Temkin isotherm behavior. Furthermore, thermodynamic evaluations indicated that the adsorption processes were spontaneous (\u0394G\u00b0 &amp;lt; 0) and endothermic (\u0394H\u00b0 &amp;gt; 0), consistent with predominantly weak-to-moderate adsorption interactions under the investigated conditions. Postadsorption BET, ATR-FTIR, and XPS analyses confirmed phosphorus-containing surface species and preserved structural integrity following nutrient uptake. The NR\u2013B2 composite requires no chemical modification, eliminates biochar particle loss, and is directly applicable as a structured adsorptive medium for tertiary nutrient polishing.<\/jats:p>","DOI":"10.1021\/acsomega.6c09189","type":"journal-article","created":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T18:01:45Z","timestamp":1790186505000},"page":"60446-60456","source":"Crossref","is-referenced-by-count":0,"title":["Biochar-Reinforced Rubber Foam as an Adsorbent for\nSimultaneous Removal of Multiple Nutrients from Wastewater: Ion-Dependent\nMechanisms and Engineering Performance"],"prefix":"10.1021","volume":"11","author":[{"given":"Sophat","family":"Phon","sequence":"first","affiliation":[{"name":"King Mongkut\u2019s University of Technology Thonburi , , ,","place":["Bangkok, Thailand, 10140"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6623-1085","authenticated-orcid":true,"given":"Yeampon","family":"Nakaramontri","sequence":"additional","affiliation":[{"name":"King Mongkut\u2019s University of Technology Thonburi , , ,","place":["Bangkok, Thailand, 10140"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7348-6847","authenticated-orcid":true,"given":"Tongchai","family":"Sriwiriyarat","sequence":"additional","affiliation":[{"name":"Burapha University , , ,","place":["Chonburi, Thailand, 20131"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2385-4936","authenticated-orcid":true,"given":"Sudtida Pliankarom","family":"Thanasupsin","sequence":"additional","affiliation":[{"name":"King Mongkut\u2019s University of Technology Thonburi , , ,","place":["Bangkok, Thailand, 10140"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,23]]},"reference":[{"key":"2026100610492486400_cit1","doi-asserted-by":"publisher","first-page":"1559","DOI":"10.3390\/w11081559","article-title":"Phosphorus and Nitrogen\nAdsorption Capacities of Biochars\nDerived from Feedstocks at Different Pyrolysis Temperatures","volume":"11","author":"Zhou","year":"2019","journal-title":"Water"},{"key":"2026100610492486400_cit2","doi-asserted-by":"publisher","first-page":"551","DOI":"10.1016\/j.jhazmat.2009.10.040","article-title":"Simultaneous\nNitrogen and Phosphorus Removal by a Novel Sequencing Batch Moving\nBed Membrane Bioreactor for Wastewater Treatment","volume":"175","author":"Yang","year":"2010","journal-title":"J. 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