Figure 4. Size selective separation of water-soluble substrates by COP-99.

(a) Change in dye concentrations over time after being treated with COP-99 in terms of absorbance relative to initial absorbance (C/C₀). Initial concentration (C₀) of all the dyes was adjusted to be 50 μM. 4-NP was tested both in acidic (4-NP-a, pH=4) and basic (4-NP-b, pH=9) conditions. Error bars reflect s.d. from duplicates. (b) Surface area distribution with respect to pore size, and its relation towards minimum van der Waals size of dye molecules.