*2.5. HPLC Analysis*

All analysis were performed on an Agilent Series 1260 (Agilent Technologies, La Jolla, CA, USA) system, equipped with an autosampler, a quaternary pump, a diode-array detector and a column compartment, controlled by Agilent1260 LC software. Separation was achieved on a ZORBAX SB-C18 analytical column (4.6 × 250 mm, 5 μm, USA) [47]. The mobile phase was 0.05% H3PO4 aqueous solution and acetonitrile, and the ratio was 95:5. The detection wavelength was 213 nm, the mobile phase flow rate was 1 mL/min and the injected sample volume was 10 μL. The temperature remained at 25 ◦C.

#### *2.6. Static Adsorption*
