Please use this identifier to cite or link to this item: https://rda.sliit.lk/handle/123456789/2945
Title: Efficient Visible-Light Photocatalysis and Antibacterial Activity of TiO2-Fe3C-Fe-Fe3O4/Graphitic Carbon Composites Fabricated by Catalytic Graphitization of Sucrose Using Natural Ilmenite
Authors: Thambiliyagodage, C
Usgodaarachchi, L
Jayanetti, M
Liyanaarachchi, C
Kandanapitiye, M
Vigneswaran, S
Keywords: Efficient
Visible-Light
Photocatalysis
Antibacterial Activity
TiO2‑Fe3C‑Fe-Fe3O4
Graphitic Carbon
Composites Fabricated
Catalytic Graphitization
Natural Ilmenite
Issue Date: 26-Jul-2022
Publisher: American Chemical Society
Citation: Thambiliyagodage, Charitha & Usgodaarachchi, Leshan & Jayanetti, Madara & Liyanaarachchi, Chamika & Kandanapitiye, Murthi & Vigneswaran, Saravanamuth. (2022). Efficient Visible-Light Photocatalysis and Antibacterial Activity of TiO 2 -Fe 3 C-Fe-Fe 3 O 4 /Graphitic Carbon Composites Fabricated by Catalytic Graphitization of Sucrose Using Natural Ilmenite. ACS Omega. 7. 10.1021/acsomega.2c02336.
Series/Report no.: ACS Omega;Vol 7, Issue 29, Pages 25403 - 25421
Abstract: Dyes in wastewater are a serious problem that needs to be resolved. Adsorption coupled photocatalysis is an innovative technique used to remove dyes from contaminated water. Novel composites of TiO2-Fe3C-Fe-Fe3O4dispersed on graphitic carbon were fabricated using natural ilmenite sand as the source of iron and titanium, and sucrose as the carbon source, which were available at no cost. Synthesized composites were characterized by X-ray diffractometry (XRD), Raman spectroscopy, transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray fluorescence spectroscopy (XRF), and diffuse reflectance UV-visible spectroscopy (DRS). Arrangement of nanoribbons of graphitic carbon with respect to the nanomaterials was observed in TEM images, revealing the occurrence of catalytic graphitization. Variations in the intensity ratio (ID/IG), Laand LD, calculated from data obtained from Raman spectroscopy suggested that the level of graphitization increased with an increased loading of the catalysts. SEM images show the immobilization of nanoplate microballs and nanoparticles on the graphitic carbon matrix. The catalyst surface consists of Fe3+and Ti4+as the metal species, with V, Mn, and Zr being the main impurities. According to DRS spectra, the synthesized composites absorb light in the visible region efficiently. Fabricated composites effectively adsorb methylene blue via π-πinteractions, with the absorption capacities ranging from 21.18 to 45.87 mg/g. They were effective in photodegrading methylene blue under sunlight, where the rate constants varied in the 0.003-0.007 min-1range. Photogenerated electrons produced by photocatalysts captured by graphitic carbon produce O2•-radicals, while holes generate OH•radicals, which effectively degrade methylene blue molecules. TiO2-Fe3C-Fe-Fe3O4/graphitic carbon composites inhibited the growth of Escherichia coli (69%) and Staphylococcus aureus (92%) under visible light. Synthesized novel composites using natural materials comprise an ecofriendly, cost-effective solution to remove dyes, and they were effective in inhibiting the growth of Gram-negative and Gram-positive bacteria.
URI: http://rda.sliit.lk/handle/123456789/2945
ISSN: 24701343
Appears in Collections:Research Papers
Research Papers - School of Natural Sciences
Research Papers - SLIIT Staff Publications
School of Natural Sciences

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