Fig. 5. (A) Absorbance at 280 nm of modified materials during cyclic elution (2 h/time) with 1.0 M HCl or 1.0 M NaOH solutions (n = 3). (B) UV-vis spectra of the eluent of modified materials immersed in 1.0 M HCl or 1.0 M NaOH solutions for 2 h.
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