Uv 2600 irs 2600plus

The photocatalytic activity of the GCN nanomaterials was investigated by means of the decomposition of AO7 and RhB in the concentration of 25 mg·L⁻¹ and 10 mg·L⁻¹, respectively. In dark, into 150 mL of this solution 45 mg of each nanomaterial was added and stirred for 60 min to reach adsorption-desorption equilibria. Then, the suspension was irradiated with a LED source (420 nm). The samples of 2 mL were taken and absorbances at 485 nm for AO7 and 496 nm and 554 nm for RhB were measured using a UV-Vis spectrometer Helios (Thermo Scientific, Waltham, MA, USA). Their full spectra were recorded by a spectrometer Shimadzu UV-2600 (IRS-2600Plus, Shimadzu, Kjóto, Japan).

The UV/vis diffuse reflectance spectra (DRS) in the range of 220–1400 nm were recorded using a spectrophotometer Shimadzu UV-2600 (IRS-2600Plus) at laboratory temperature. Reflectance data were re-calculated to absorbance ones using Schuster–Kubelka–Munk’s equation F(R_∞) as follows: $F\left(R_{\infty }\right)=\frac{{\left(1-R_{\infty }\right)}^2}{2R_{\infty }},$
where R_∞ is the diffuse reflectance from a semi-infinite layer. The obtained DRS spectra were transformed to the dependencies of (F(R_∞)·hν)² on hν in order to obtain the optical band gap energies of the prepared nanomaterials.