Green clay materials applied in packed bed columns for adsorption of hexavalent chromium from aqueous solutions

Green clay materials applied in packed bed columns for adsorption of hexavalent chromium from aqueous solutions | 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 Green clay materials applied in packed bed columns for adsorption of hexavalent chromium from aqueous solutions Mabrouk Eloussaief, Nesrine Dammak, Sana Ghrab, Olfa Ouled Ltaief, and 2 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4393785/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 The removal of hazardous metal ions from polluted water is a crucial process aimed at enhancing water quality. In this study, we conducted a dynamic adsorption investigation utilizing natural green clay for the removal of hexavalent chromium from aqueous solutions. The material underwent characterization through various techniques, including fluorescence spectrometry (XRF), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and nitrogen-physisorption (BET). Column tests of green clay material and sand mixtures were performed to evaluate sorption in dynamic systems. Adsorption conditions were examined by varying the initial Cr 6+ concentration, flow rate and column height. The maximum purification was achieved at a concentration of 50 mg/L, a flow rate of 3mL/min and a bed height of 12 cm. The mathematical models of Bohart-Adams, Thomas, and Yoon-Nelson were employed to analyze experimental data and predict breakthrough curves in continuous adsorption. Through comparison of R 2 values, it was determined that the Yoon-Nelson and Thomas diffusion models effectively capture and accurately describe the experimental data. The results obtained indicate a potential expansion of fixed-bed adsorption for the heavy metals treatment in industrial-scale wastewater. Additionally, the natural green clay material exhibited remarkable reusability and showed promising characteristics for various environmental and industrial applications. Green clay Characterization Hexavalent chromium Adsorption Fixed bed column Modeling Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Full Text Additional Declarations No competing interests reported. Table 1 and 2 are available in the Supplementary Files section. Supplementary Files Table.doc 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. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. 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-4393785","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":303675787,"identity":"be206b72-4f1b-4365-9684-aa8349d337d9","order_by":0,"name":"Mabrouk 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optimal experimental conditions: initial concentration 50mg/L, flow rate 3mL/min, and bed height 12cm).\u003c/p\u003e","description":"","filename":"floatimage9.png","url":"https://assets-eu.researchsquare.com/files/rs-4393785/v1/a1a31f8344d9058bbdb0e3ef.png"},{"id":57287553,"identity":"fc9ba97f-6b9b-47af-aaa4-d90f26f61b4f","added_by":"auto","created_at":"2024-05-28 16:46:21","extension":"png","order_by":10,"title":"Figure 10","display":"","copyAsset":false,"role":"figure","size":329759,"visible":true,"origin":"","legend":"\u003cp\u003eEfficiency of GCM in Cr(VI) purification and its potential applications\u003c/p\u003e","description":"","filename":"floatimage10.png","url":"https://assets-eu.researchsquare.com/files/rs-4393785/v1/3196dc6e0efef6519dd5ac69.png"},{"id":57288466,"identity":"78b5378e-16b6-4c1b-96b7-5b3ebe7284ab","added_by":"auto","created_at":"2024-05-28 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chromium from aqueous solutions","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":true,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"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},"keywords":"Green clay, Characterization, Hexavalent chromium, Adsorption, Fixed bed column, 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In this study, we conducted a dynamic adsorption investigation utilizing natural green clay for the removal of hexavalent chromium from aqueous solutions. The material underwent characterization through various techniques, including fluorescence spectrometry (XRF), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and nitrogen-physisorption (BET). Column tests of green clay material and sand mixtures were performed to evaluate sorption in dynamic systems. Adsorption conditions were examined by varying the initial Cr\u003csup\u003e6+\u003c/sup\u003e concentration, flow rate and column height. The maximum purification was achieved at a concentration of 50 mg/L, a flow rate of 3mL/min and a bed height of 12 cm.\u003c/p\u003e \u003cp\u003eThe mathematical models of Bohart-Adams, Thomas, and Yoon-Nelson were employed to analyze experimental data and predict breakthrough curves in continuous adsorption. Through comparison of R\u003csup\u003e2\u003c/sup\u003e values, it was determined that the Yoon-Nelson and Thomas diffusion models effectively capture and accurately describe the experimental data.\u003c/p\u003e \u003cp\u003eThe results obtained indicate a potential expansion of fixed-bed adsorption for the heavy metals treatment in industrial-scale wastewater. 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