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. 2022 Nov 24;15(23):8380. doi: 10.3390/ma15238380

Figure 7.

Figure 7

O 1s XPS spectra of the titanium oxide-based aerogel catalysts doped by different Fe sources: (a) TA/Fe1, (b) TA/Fe2, (c) TA/Fe3, (d) TA/Fe4.