Research Article
Adsorption of Chromium(VI) from Aqueous Solutions by Coffee Polyphenol-Formaldehyde/Acetaldehyde Resins
Figure 3
FTIR spectra of decaffeinated coffee powder (A), coffee polyphenol-formaldehyde resins (virgin) (B), and coffee polyphenol-formaldehyde resins with Cr(VI) (C).