fig3

Figure 3. XPS spectra of as-prepared materials (A) survey; (B) C 1s; (C) O 1s; (D) N 1s. CDs: Carbon dots; CDs/HCPP: carbon dots incorporated in hydrochar; XPS: X-ray photoelectron spectroscopy.
Figure 3. XPS spectra of as-prepared materials (A) survey; (B) C 1s; (C) O 1s; (D) N 1s. CDs: Carbon dots; CDs/HCPP: carbon dots incorporated in hydrochar; XPS: X-ray photoelectron spectroscopy.
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