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(a) XRD patterns of C/C3N4-1100, 10 mg-Fe@C/C3N4-1100, 20 mg-Fe@C/C3N4-1100, and 30 mg-Fe@C/C3N4-1100. (b) N 1s and (c) Fe 2p XPS spectra of 20 mg-Fe@C/C3N4-1100 and 20 mg-Fe@C/C3N4-900. (d) H-TPR spectra of 20 mg-Fe@C/C3N4-1100 and 20 mg-Fe@C/C3N4-900.
