Enhancing the photocatalytic activity of TiO2 nanoparticles using green Carbon quantum dots

International Journal of Nano Dimension

مقاله 1، دوره 13، شماره 2، مرداد 2022، صفحه 144-154   

نوع مقاله: Reasearch Paper

شناسه دیجیتال (DOI): 10.22034/ijnd.2022.685460

نویسندگان

Irié Bi Irié Williams^{1، 2}؛ Essy Kouadio Fodjo^{* 2}؛ Kouyaté Amadou³؛ Trokourey Albert²؛ Cong Kong^{1، 4}

¹Key Laboratory of East China Sea Fishery Resources Exploitation, Ministry of Agriculture and Rural Affairs, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, China.

²Laboratory of Constitution and Reaction of Matter, UFR SSMT, Université Felix Houphouet Boigny, 22 BP 582 Abidjan 22, Cote d’Ivoire.

³Laboratory of Environmental Sciences and Technology, Université Jean Lorougnon Guédé, BP 150 Daloa, Cote d’Ivoire.

⁴Shanghai Key Laboratory of Forensic Medicine (Academy of Forensic Science), Shanghai 200063, China.

چکیده

A simple and green method based on chemical fragmentation of wood charcoal is used to produce carbon quantum dots (CQDs). These CQDs are used to form a nanocomposite with synthesized titanium dioxide nanoparticles (TiO₂/CQDs). The X-ray diffraction (XRD) analysis of this TiO₂/CQDs nanocomposite has revealed that the presence of CQDs in these TiO₂/CQDs does not affect the TiO₂ NPs crystalline structure; while the characterization using scanning electron microscopy (SEM) analysis shows a porous structure of TiO₂ NPs and TiO₂/CQDs resulting from the aggregation of nanoparticles with a mean size of around 25 nm and 30 nm for TiO₂ NPs and TiO₂/CQDs, respectively. Furthermore, a transmission electron microscopy (TEM) analysis displays particle size around 4 nm for CQDs. Besides, the reflectance study in the visible range shows that the presence of CQDs reduces the reflection of sunlight by TiO₂ NPs in TiO₂/CQDs nanocomposite. Moreover, compared to TiO₂ NPs, TiO₂/CQDs have a higher rate for methylene blue (MB) photocatalytic degradation. Indeed, an efficiency of up to 100% within ten minutes of sun exposure for the degradation of 7.5 mg/L MB can be achieved using TiO₂/CQDs in opposition to thirty minutes using TiO₂NPs under the same conditions. This efficiency is obviously due to the reduction of the reflective properties of TiO₂ NPs in the visible range by the presence of CQDs in the TiO₂/CQDs nanocomposite. These results suggest that TiO₂/CQDs could be used as heterogeneous photocatalyst for the degradation of similar compounds in water bodies under solar irradiation.

کلیدواژه‌ها

Carbon Quantum Dots (CQDs)؛ Fluorescent CQDs؛ Methylene Blue Photocatalytic Degradation؛ Reduction of TiO2 Reflective Property؛ TiO2 Nanoparticle Synthesis

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Supplementary material.pdf

Supplementary material.pdf

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