Adsorption equilibrium and kinetics of maxilon blue GRL on cotton fiber

Adsorption equilibrium and kinetics of maxilon blue GRL on cotton fiber | 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 Adsorption equilibrium and kinetics of maxilon blue GRL on cotton fiber JingXuan Gao, Fanglan Guan, Yanhui Tang, Xiuyan Li, Tao Ma, Peizhu Zheng This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-6570629/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted 9 You are reading this latest preprint version Abstract The adsorption interaction between cotton fibers and dye maxilon blue GRL was systematically investigated under varying contact times, initial dye concentrations, agitation speeds and temperatures; and the adsorption capacity of dyes increases with the increase of those four parameters. Analysis of adsorption isotherms revealed superior fit with the Langmuir model compared to the Freundlich model, and both the saturated adsorption capacity q m and adsorption capacity K F exhibited temperature-dependent enhancement. The adsorption of dye onto cotton fibers could be described satisfactorily by the pseudo-second-order rate model, where both the equilibrium adsorption amount q e and the apparent rate constant k 2 increase with elevated agitation speeds and temperatures. Thermodynamic analysis yielded an enthalpy change Δ H * of 63.5 kJ·mol⁻¹ and Gibbs energy change Δ G * of 8.7 kJ·mol⁻¹, collectively indicating a non-spontaneous endothermic process. The negative entropy change (Δ S * = ⎼209.3 J·mol − 1 ·K − 1 ) suggested reduced molecular randomness at the solid-liquid interface during adsorption. The low activation energy ( E ₐ = 11.34 kJ·mol⁻¹) and adsorption enthalpy change confirmed physical adsorption mechanisms dominated by hydrogen bonding. Understanding the interaction between fiber and dye is helpful for optimizing dye utilization in industrial processes and engineering modified cotton fibers for wastewater decolorization. Adsorption Cotton fiber Dye Kinetics Mechanism Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Under Review Version 1 posted Reviewers agreed at journal 20 May, 2025 Reviews received at journal 20 May, 2025 Reviewers agreed at journal 19 May, 2025 Reviewers agreed at journal 19 May, 2025 Reviewers invited by journal 19 May, 2025 Editor invited by journal 12 May, 2025 Editor assigned by journal 08 May, 2025 Submission checks completed at journal 08 May, 2025 First submitted to journal 01 May, 2025 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-6570629","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":459136170,"identity":"659e2544-6aa3-4da1-a8c5-1da0f5d73407","order_by":0,"name":"JingXuan Gao","email":"","orcid":"","institution":"Beijing Institute of Fashion Technology","correspondingAuthor":false,"prefix":"","firstName":"JingXuan","middleName":"","lastName":"Gao","suffix":""},{"id":459136172,"identity":"a07d7aab-58e7-4e42-8675-c038bdd3e66e","order_by":1,"name":"Fanglan Guan","email":"","orcid":"","institution":"Beijing Institute of Fashion 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Series","inReviewEnabled":true,"inReviewRevisionsEnabled":true},"keywords":"Adsorption, Cotton fiber, Dye, Kinetics, Mechanism","lastPublishedDoi":"10.21203/rs.3.rs-6570629/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-6570629/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eThe adsorption interaction between cotton fibers and dye maxilon blue GRL was systematically investigated under varying contact times, initial dye concentrations, agitation speeds and temperatures; and the adsorption capacity of dyes increases with the increase of those four parameters. Analysis of adsorption isotherms revealed superior fit with the Langmuir model compared to the Freundlich model, and both the saturated adsorption capacity \u003cem\u003eq\u003c/em\u003e\u003csub\u003em\u003c/sub\u003e and adsorption capacity \u003cem\u003eK\u003c/em\u003e\u003csub\u003eF\u003c/sub\u003e exhibited temperature-dependent enhancement. The adsorption of dye onto cotton fibers could be described satisfactorily by the pseudo-second-order rate model, where both the equilibrium adsorption amount \u003cem\u003eq\u003c/em\u003e\u003csub\u003ee\u003c/sub\u003e and the apparent rate constant \u003cem\u003ek\u003c/em\u003e\u003csub\u003e2\u003c/sub\u003e increase with elevated agitation speeds and temperatures. Thermodynamic analysis yielded an enthalpy change Δ\u003cem\u003eH\u003c/em\u003e* of 63.5 kJ\u0026middot;mol⁻\u0026sup1; and Gibbs energy change Δ\u003cem\u003eG\u003c/em\u003e* of 8.7 kJ\u0026middot;mol⁻\u0026sup1;, collectively indicating a non-spontaneous endothermic process. The negative entropy change (Δ\u003cem\u003eS\u003c/em\u003e* = ⎼209.3 J\u0026middot;mol\u003csup\u003e\u0026minus;\u0026thinsp;1\u003c/sup\u003e\u0026middot;K\u003csup\u003e\u0026minus;\u0026thinsp;1\u003c/sup\u003e) suggested reduced molecular randomness at the solid-liquid interface during adsorption. The low activation energy (\u003cem\u003eE\u003c/em\u003eₐ = 11.34 kJ\u0026middot;mol⁻\u0026sup1;) and adsorption enthalpy change confirmed physical adsorption mechanisms dominated by hydrogen bonding. Understanding the interaction between fiber and dye is helpful for optimizing dye utilization in industrial processes and engineering modified cotton fibers for wastewater decolorization.\u003c/p\u003e","manuscriptTitle":"Adsorption equilibrium and kinetics of maxilon blue GRL on cotton fiber","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2025-05-21 10:31:06","doi":"10.21203/rs.3.rs-6570629/v1","editorialEvents":[{"type":"communityComments","content":0},{"type":"reviewerAgreed","content":"326321756783192571108205363659492720170","date":"2025-05-21T00:23:05+00:00","index":"hide","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2025-05-20T07:06:08+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"338646002630163150949672247471410352018","date":"2025-05-19T19:13:33+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"190352604296927929352987299445704067958","date":"2025-05-19T18:03:50+00:00","index":"hide","fulltext":""},{"type":"reviewersInvited","content":"","date":"2025-05-19T15:08:16+00:00","index":"","fulltext":""},{"type":"editorInvited","content":"","date":"2025-05-12T15:13:33+00:00","index":"","fulltext":""},{"type":"editorAssigned","content":"","date":"2025-05-08T09:16:16+00:00","index":"","fulltext":""},{"type":"checksComplete","content":"","date":"2025-05-08T09:11:28+00:00","index":"","fulltext":""},{"type":"submitted","content":"Discover Chemistry","date":"2025-05-01T08:55:17+00:00","index":"","fulltext":""}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"discover-chemistry","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"","sideBox":"Learn more about [Discover Chemistry](https://link.springer.com/journal/44371)","snPcode":"44371","submissionUrl":"https://submission.nature.com/new-submission/44371/3","title":"Discover Chemistry","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"stoa","reportingPortfolio":"Discover Series","inReviewEnabled":true,"inReviewRevisionsEnabled":true}}],"origin":"","ownerIdentity":"cc532dad-18ae-42f6-a223-e2a984dc6054","owner":[],"postedDate":"May 21st, 2025","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"under-review","subjectAreas":[],"tags":[],"updatedAt":"2025-09-05T10:08:54+00:00","versionOfRecord":[],"versionCreatedAt":"2025-05-21 10:31:06","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-6570629","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-6570629","identity":"rs-6570629","version":["v1"]},"buildId":"8U1c8b4HqxoKbykW_rLl7","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}