Mesoporous Carbon from Optimized Date Stone Hydrochar by Catalytic Hydrothermal Carbonization Using Response Surface Methodology: Application to Dyes Adsorption

Figure 5

(a) FT-IR vibrational spectra of Ds, OHC-Ds, and AOHC-Ds. (b) XRD patterns of the OHC-Ds and AOHC-Ds. (c) Point of zero charge of the AOHC-Ds.

(a)

(b)

(c)