Fig. 7. (a) FT-IR spectra of before and after adsorption of BPS and BPA onto COF-1 and COF-2; (b and c) regeneration test of COF-1 and COF-2 for the adsorption of BPS and BPA (adsorption: C₀ = 30 mg L⁻¹, T = 303 K, t = 3 h, m/V = 0.2 g L⁻¹; desorption with methanol, t = 1 h, V = 40 ml).