fig3

Figure 3. (A) PL spectrum and photocatalytic mechanism of ZnS@N-C-3; (B) UV-Vis DRS spectra and band gap analysis plot of ZnS and ZnS@N-C-3; Zn 2p (C); S 2p (E); C 1s (D); and N 1s (F) XPS spectra of ZnS and fresh and used ZnS@N-C-3. Copyright 2019, MDPI^[30]. PL: Photoluminescence; ZnS: Zinc sulfide; UV-Vis: ultravoilet-visble; DRS: diffuse reflectance spectroscopy; XPS: X-ray photoelectron spectroscopy.