Surface modification of biochars for efficient Cu2+ adsorption: Effects of microwave-assisted oxygen and nitrogen doping via hydrogen peroxide and nitric acid

Basit Öğe Kaydı
dc.contributor.authorMurat, Derya
dc.contributor.authorTegin, Ibrahim
dc.contributor.authorSaka, Cafer
dc.date.accessioned2026-10-23T18:14:02Z
dc.date.available2026-10-23T18:14:02Z
dc.date.issued2026
dc.departmentSiirt Üniversitesi
dc.description.abstractIn this study, microwave-assisted heteroatom doping was employed to synthesize oxygen-functionalized (MW@O) and nitrogen-oxygen dual-functionalized (MW@N, O) biochars, which were evaluated for Cu2+ removal from aqueous solutions. Comprehensive adsorption analyses, including isotherm modeling, kinetic evaluation, thermodynamic assessment, and point of zero charge (pH(p)zc) determination, were performed to clarify the adsorption behavior. The pH(p)zc values of MW@O and MW@N, O doped biochars were 6.15 and 4.27, respectively, indicating enhanced Cu2+ uptake at pH values above these thresholds due to favorable electrostatic interactions. At 303 K, Langmuir monolayer capacities (Q(m)) were 109.89 mg/g for MW@O doped biochar and 140.84 mg/g for MW@N, O doped biochar. Although surface area decreased after modification, adsorption capacity increased, suggesting that Cu2+ uptake was primarily governed by the enrichment of oxygen- and nitrogen-containing functional groups (e.g., -OH, -COOH, -NH2) rather than porosity. Adsorption followed the Langmuir model and proceeded through combined electrostatic attraction and surface complexation mechanisms. These results demonstrate that microwave-assisted heteroatom modification effectively tailors' biochar surface chemistry and enhances Cu2+ adsorption performance under controlled experimental conditions, providing mechanistic insight into the role of surface functionalization in heavy metal removal.
dc.description.sponsorshipSiirt University [2024-SIUEFBE-014] -- The study supported by Siirt University's Scientific Research Projects support unit (2024-SIUEFBE-014) .
dc.identifier.doi10.1016/j.biombioe.2026.109208
dc.identifier.issn0961-9534
dc.identifier.issn1873-2909
dc.identifier.scopus2-s2.0-105034534918
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1016/j.biombioe.2026.109208
dc.identifier.urihttps://hdl.handle.net/20.500.12604/12264
dc.identifier.volume211
dc.identifier.wosWOS:001711188300001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherPergamon-Elsevier Science Ltd
dc.relation.ispartofBiomass & Bioenergy
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WOS_20261017
dc.subjectCopper Ion Adsorption
dc.subjectBiochar Modification
dc.subjectOxygen And Nitrogen Doping: Hydrogen Peroxide
dc.subjectNitric Acid
dc.titleSurface modification of biochars for efficient Cu2+ adsorption: Effects of microwave-assisted oxygen and nitrogen doping via hydrogen peroxide and nitric acid
dc.typeArticle

Dosyalar

Koleksiyon

WOS İndeksli Yayınlar Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu