How do I determine the band gap of gCN/TiO2 heterostructure if the UV Vis absorbance spectrum has 2 absorption edges?

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Hi!

I synthesised gCN/TiO2 heterostructures. From the UV Vis spectra, there are 2 absorption edges. How do I determine the band gap of the heterostructure from Tauc plot? Which edge should I use?

Many thanks.

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