Construction of a novel NiO-bentonite composite for enhanced tetracycline degradation under visible light irradiation

Basit Öğe Kaydı
dc.contributor.authorOncel, Levent
dc.date.accessioned2026-04-25T14:19:55Z
dc.date.available2026-04-25T14:19:55Z
dc.date.issued2026
dc.departmentSinop Üniversitesi
dc.description.abstractIn this study, a novel ceramic composite based on NiO and bentonite (NiO/BEN) was successfully synthesized via the hydrothermal method for the effective photocatalytic degradation of tetracycline (TC) in aqueous solutions. The synthesized composites were characterized using XRD, SEM/EDS, UV-Vis DRS, PL, XPS, BET, and FTIR techniques. The analyses revealed that NiO and bentonite formed a well-integrated heterostructure, and NiO/BEN had absorption in both the UV and visible light regions, with stronger absorption in the UV region. BET analysis confirmed a mesoporous structure with a specific surface area of 9.66 m(2)/g, considerably higher than those typically reported for pristine NiO, indicating improved accessibility of active sites. FTIR spectra exhibited characteristic peaks at 1042.8, 1012.9, 790.05, and 466.33 cm(-)(1), confirming the coexistence of NiO and bentonite phases with preserved structural integrity. The composite had a band gap of 4.05 eV, which effectively promoted electron-hole pair generation, while the shallow and deep defects in the structure facilitated efficient charge separation. In photocatalytic degradation experiments, NiO-bentonite composite showed much better performance compared to pristine NiO (19.51%), while increasing the NiO: bentonite ratio from 1:0.2 (52.41%) to 1:0.5 (85.58%) significantly enhanced the tetracycline removal efficiency after 120 min of visible-light irradiation at neutral pH. The composite also exhibited strong photocatalytic activity across different water matrices, achieving 85.58% removal in distilled water and maintaining appreciable efficiencies of 69.52% in tap water and 70.67% in drinking water, where competing ions and dissolved organics are present. Reusability tests showed a gradual decline in efficiency from 85.58% in the first cycle to 69.09%, 50.65%, 39.34%, and 24.34% over five consecutive cycles, likely due to the accumulation of non-degradable by-products on active sites. The degradation reaction was found to be driven primarily by photogenerated holes, with superoxide radicals also playing an important role. Under sole visible-light irradiation and without added oxidants, the NiO-bentonite composite removed 85.58% of tetracycline at neutral pH, 93.61% at pH 3, and 78.47% at pH 10-each value representing a more than fourfold improvement over pristine NiO (19.51%) and surpassing all NiO/clay systems reported to date-thereby offering an energy-efficient, environmentally friendly, and readily scalable photocatalyst for next-generation water-treatment technologies targeting antibiotic contamination.
dc.identifier.doi10.1007/s41779-025-01306-9
dc.identifier.endpage454
dc.identifier.issn2510-1560
dc.identifier.issn2510-1579
dc.identifier.issue1
dc.identifier.orcid0000-0002-6018-8741
dc.identifier.scopus2-s2.0-105022407427
dc.identifier.scopusqualityQ2
dc.identifier.startpage441
dc.identifier.urihttps://doi.org/10.1007/s41779-025-01306-9
dc.identifier.urihttps://hdl.handle.net/11486/8246
dc.identifier.volume62
dc.identifier.wosWOS:001616641300001
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthorOncel, Levent
dc.language.isoen
dc.publisherSpringer
dc.relation.ispartofJournal of The Australian Ceramic Society
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WOS_20260420
dc.subjectPhotocatalysis
dc.subjectMetal oxide
dc.subjectNickel oxide
dc.subjectBentonite
dc.subjectAntibiotic
dc.subjectCeramic
dc.titleConstruction of a novel NiO-bentonite composite for enhanced tetracycline degradation under visible light irradiation
dc.typeArticle

Dosyalar

Koleksiyon

WoS İndeksli Yayınlar Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu