fig11

Figure 11. (A) UV-vis light absorption of the prepared photocatalysts and the inset represents the multiple reflection effect of the incident light inside the hollow cavities. (B) PL spectra of photocatalysts at excitation wavelength of 380 nm. (C) TRPL spectra of the samples. (D) CO₂ adsorption isotherm of C-ZnO CTSHSs and 2% Mn, C-ZnO-CTSHS samples. Figure 11 A-D is reprinted from Ref.^[192] under the CC BY 4.0 license. UV-vis: Ultraviolet–visible; PL: photoluminescence; TRPL: time-resolved photoluminescence; CTSHS: core-triple shell hollow sphere.