Fig. 4

XPS spectrum of ZnMnO-HPC: (a) wide-scan XPS spectra; (b–e) high-resolution XPS spec-tra of C 1s, O 1s, Zn 2p and Mn 2p, respectively.
XPS spectrum of ZnMnO-HPC: (a) wide-scan XPS spectra; (b–e) high-resolution XPS spec-tra of C 1s, O 1s, Zn 2p and Mn 2p, respectively.