Novel Fe/Ca oxide co-coated biochar enables efficient phosphorus recovery

Novel Fe/Ca oxide co-coated biochar enables efficient phosphorus recovery | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Novel Fe/Ca oxide co-coated biochar enables efficient phosphorus recovery Anqi Hu, Yongcan Jiang, Jiaqi An, Xiaodian Huang, Abdelbaky Hossam Elgarhy, and 2 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4160616/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Efficient elimination and retrieval of phosphorus from water bodies are crucial for effective eutrophication management and phosphorus reuse. A novel Fe/Ca oxide co-coated modified biochar (FCBC) was synthesized for phosphate recovery using coconut shell biochar as the raw material with ferrous chloride (FeCl 2 ) and calcium peroxide (CaO 2 ) as precursors. FCBC possesses a highly intricate pore structure and an abundance of surface-active groups. Fe/Ca oxides are loaded onto the biochar in the form of Ca 2 Fe 2 O 5 , Fe 2 O 3 , and CaCO 3 . FCBC demonstrates a broad pH tolerance range (pH = 6 – 12) in the aquatic environment. Phosphorus absorption by FCBC was simulated using the proposed pseudo-second-order kinetic and Langmuir model. The maximal saturation adsorption capacity was found to be 53.31 mg P/g. Phosphorus elimination is influenced by the generation of Ca 3 (PO 4 ) 2 , intraparticle diffusion, and electrostatic attraction. FCBC produced demonstrated exceptional phosphorus removal effectiveness in the presence of multiple anions, except for wastewater with high concentrations of SO 4 2- , CO 3 2- , HCO 3 - , and F - (>500 mg/L). The phosphorus removal effectiveness of FCBC in natural water samples collected from ponds, farmlands, and ditches exceeded 94%. This paper presents a novel technique for creating iron-calcium composite-modified biochar, which offers a valuable method for efficiently recovering phosphorus from agricultural surface waters. Modified biochar Fe/Ca bimetallic oxide Phosphorus recovery Efficient adsorption Full Text Supplementary Files AppendixA.Supplementarymaterial.docx Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-4160616","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":292848291,"identity":"d1d34f98-4468-4ee7-9b87-0956ffa935c9","order_by":0,"name":"Anqi Hu","email":"","orcid":"","institution":"Huazhong Agricultural University College of Resources and Environment","correspondingAuthor":false,"prefix":"","firstName":"Anqi","middleName":"","lastName":"Hu","suffix":""},{"id":292848292,"identity":"d057a586-df04-4e28-b3f1-0a3c5571ca0a","order_by":1,"name":"Yongcan Jiang","email":"","orcid":"","institution":"PowerChina Huadong Engineering 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adsorption","lastPublishedDoi":"10.21203/rs.3.rs-4160616/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-4160616/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eEfficient elimination and retrieval of phosphorus from water bodies are crucial for effective eutrophication management and phosphorus reuse. A novel Fe/Ca oxide co-coated modified biochar (FCBC) was synthesized for phosphate recovery using coconut shell biochar as the raw material with ferrous chloride (FeCl\u003csub\u003e2\u003c/sub\u003e) and calcium peroxide (CaO\u003csub\u003e2\u003c/sub\u003e) as precursors. FCBC possesses a highly intricate pore structure and an abundance of surface-active groups. Fe/Ca oxides are loaded onto the biochar in the form of Ca\u003csub\u003e2\u003c/sub\u003eFe\u003csub\u003e2\u003c/sub\u003eO\u003csub\u003e5\u003c/sub\u003e, Fe\u003csub\u003e2\u003c/sub\u003eO\u003csub\u003e3\u003c/sub\u003e, and CaCO\u003csub\u003e3\u003c/sub\u003e. FCBC demonstrates a broad pH tolerance range (pH = 6 – 12) in the aquatic environment. Phosphorus absorption by FCBC was simulated using the proposed pseudo-second-order kinetic and Langmuir model. The maximal saturation adsorption capacity was found to be 53.31 mg P/g. Phosphorus elimination is influenced by the generation of Ca\u003csub\u003e3\u003c/sub\u003e(PO\u003csub\u003e4\u003c/sub\u003e)\u003csub\u003e2\u003c/sub\u003e, intraparticle diffusion, and electrostatic attraction. FCBC produced demonstrated exceptional phosphorus removal effectiveness in the presence of multiple anions, except for wastewater with high concentrations of SO\u003csub\u003e4\u003c/sub\u003e\u003csup\u003e2-\u003c/sup\u003e, CO\u003csub\u003e3\u003c/sub\u003e\u003csup\u003e2-\u003c/sup\u003e, HCO\u003csub\u003e3\u003c/sub\u003e\u003csup\u003e-\u003c/sup\u003e, and F\u003csup\u003e-\u003c/sup\u003e (\u0026gt;500 mg/L). The phosphorus removal effectiveness of FCBC in natural water samples collected from ponds, farmlands, and ditches exceeded 94%. This paper presents a novel technique for creating iron-calcium composite-modified biochar, which offers a valuable method for efficiently recovering phosphorus from agricultural surface waters.\u003c/p\u003e","manuscriptTitle":"Novel Fe/Ca oxide co-coated biochar enables efficient phosphorus recovery","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2024-04-23 09:45:48","doi":"10.21203/rs.3.rs-4160616/v1","editorialEvents":[{"type":"communityComments","content":0}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true}}],"origin":"","ownerIdentity":"0e8ffae5-3b22-4cde-802b-b997eea730c5","owner":[],"postedDate":"April 23rd, 2024","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"posted","subjectAreas":[],"tags":[],"updatedAt":"2024-05-19T07:21:25+00:00","versionOfRecord":[],"versionCreatedAt":"2024-04-23 09:45:48","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-4160616","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-4160616","identity":"rs-4160616","version":["v1"]},"buildId":"qtupq5eGEP_6zYnWcrvyt","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}