Publication: Photocatalytic degradation of organic pollutants under solar irradiation using single-walled carbon nanotube/titanium dioxide nanocomposites
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Issued Date
2025-12-01
Resource Type
eISSN
2666934X
Scopus ID
2-s2.0-105018095580
Journal Title
Jcis Open
Volume
20
Rights Holder(s)
SCOPUS
Bibliographic Citation
Jcis Open Vol.20 (2025)
Suggested Citation
Aeimbhu A., Amonkosolpan J., Boonyaratgalin W., Supanam N. Photocatalytic degradation of organic pollutants under solar irradiation using single-walled carbon nanotube/titanium dioxide nanocomposites. Jcis Open Vol.20 (2025). doi:10.1016/j.jciso.2025.100157 Retrieved from: https://hdl.handle.net/20.500.14740/50614
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Abstract
A nanocomposite of titanium dioxide nanoparticles (TiO<inf>2</inf> NPs: P25) modified with single-walled carbon nanotubes (SWCNTs) was synthesized using a simple mixing method, with varying TiO<inf>2</inf> NP mass ratios (5–20 wt%). The nanocomposites were characterized using field emission scanning electron microscopy (FE-SEM), Brunauer-Emmett-Teller (BET) analysis, X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and UV–Vis diffuse reflectance spectroscopy (DRS). Photocatalytic degradation performance was evaluated using methylene blue as a model organic pollutant under solar light irradiation. FE-SEM images confirmed the effective dispersion of TiO<inf>2</inf> NPs within SWCNT bundles, while FTIR analysis verified the incorporation of both TiO<inf>2</inf> NPs and SWCNTs. Adding SWCNTs extended TiO<inf>2</inf>'s light absorption from the ultraviolet to the visible range, enhancing photocatalytic degradation under solar light compared to TiO<inf>2</inf>. Tauc plot analysis revealed TiO<inf>2</inf>NPs have an indirect energy band gap of 3.24 eV, while the SWCNTs/TiO<inf>2</inf> nanocomposites with a 1:5 mass ratio showed a direct energy band gap of 1.22 eV. The SWCNTs/TiO<inf>2</inf> nanocomposite (1:5) exhibited the highest specific surface area. Photocatalytic experiments with this ratio achieved up to 99 % removal of methylene blue within 60 min of sunlight exposure. Furthermore, SWCNTs can accelerate the formation of TiO<inf>2</inf> NPs sludge within 2 h. The SWCNTs-supported TiO<inf>2</inf> sludge is reusable in catalytic applications, helping to minimize waste disposal concerns.