preprint · Preprints.org
Researchers have synthesised a novel nanocomposite combining titanium dioxide, manganese, and multi-walled carbon nanotubes using a sol-gel process. The objective was to shift the material absorption band edge towards longer wavelengths and improve the separation of electron-hole pairs, which is vital for enhancing photocatalytic activity. Structural and chemical characterisations using techniques such as X-ray diffraction, X-ray photoelectron spectroscopy, and UV-vis absorption spectroscopy confirmed the integration of manganese and carbon nanotubes into the titanium dioxide matrix. When tested on the degradation of methylene blue as a model organic pollutant, a formulation containing five per cent carbon nanotubes proved most effective. This composite achieved a degradation rate exceeding 92 per cent, with a rate constant of 2.59 × 10⁻² min⁻¹, demonstrating significant photocatalytic efficiency.
Removing toxic organic pollutants from wastewater requires efficient and stable catalytic materials. By combining titanium dioxide with manganese and carbon nanotubes, this research produces a material that captures light more effectively and accelerates chemical breakdown, offering an improved mechanism for treating contaminated water.
This work represents early-stage laboratory research focused on water treatment and pollutant degradation. It could eventually enable enhanced photocatalytic filters or treatment systems for industrial wastewater management companies. However, testing has only been conducted on a model dye under laboratory conditions, indicating that substantial development and real-world pilot validation are still required.
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Titanium dioxide manganese/multi-walled carbon nanotubes (MTiO₂/x-CNT) nanocomposites were successfully prepared using the sol-gel method by reaction specific amounts of CNT with titanium dioxide and manganese, aiming to shift the band edge toward longer wavelengths and provide more effective separation of electron-hole pairs. The MTiO₂ and MTiO₂/CNTs were then characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV–vis absorption spectra. The results confirm the successful synthesis and the presence of Mn and CNT in the nanocomposite. The photocatalytic performance was evaluated by investigating the removal of methylene blue as an example of organic pollutants. Among the various composites examined, the MTiO₂/CNT (5%) exhibited the best performance in removing MB, with a degradation rate exceeding 92% and a rate constant of 2.59 × 10⁻² min⁻¹. These results suggest that this compound could have potential applications in other fields.
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DOI: 10.20944/preprints202504.0001.v1
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