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Ultraviolet–visible spectroscopy (UV-Vis) spectra of metal-free porphyrins THPP (a), TCPP (b), 10−4 M with graphene oxide (GO) in different concentrations of GO red—20 mg/L, green—40 mg/L, blue—60 mg/L, cyan—80 mg/L. Diffuse reflectance spectra of GO, TCPP-GO and THPP-GO supramolecular assemblies isolated as a solid phase (c).
