Fig. 4From: Two-Solvent Method Synthesis of NiO/ZnO Nanoparticles Embedded in Mesoporous SBA-15: Photocatalytic Properties StudyXPS spectra of 30 % NiO/ZnO/SBA-15. a Si 2p. b O 1 s. c Ni 2p. d Zn 2pBack to article page