Fig. 9From: Microwave-Assisted Synthesis of Carbon-Based (N, Fe)-Codoped TiO2 for the Photocatalytic Degradation of FormaldehydeXPS spectra of undoped, 0.4 N-doped, 0.01 Fe-doped, and 0.4 N-0.01 Fe-codoped AC/TiO2 powders: (a) Ti2p, (b) O1s, (c) Fe2p and N1s Back to article page