2.6.4. Adsorption Kinetics of Dencichine on RCMs and RPMs

The adsorption process of dencichine was studied with the optimal experimental mass. The RCMs and RPMs were used to adsorb dencichine (0.1 mg/mL) in an 80 rpm air constant temperature oscillator at 25 ◦C. Samples of 0.5 mL were absorbed with 1 mL syringe at 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 15, 20, 25, 30, 45, 60, 75, 90, 105, 120, 135, 150, 180, 240, 300 min, respectively, and the content of dencichine was determined by HPLC. Subsequently, the adsorption kinetic curve according to the relationship between time and adsorption amount was plotted.

#### 2.6.5. Adsorption Isotherm and Thermodynamics of Dencichine on the RCMs and RPMs

To evaluate the adsorption isotherm of dencichine on RCMs and RPMs, the adsorption was carried out by the addition of 150 mg RCMs or 20mg RPMs into 20 mL of dencichine solution with different concentrations (0.08, 0.10, 0.12, 0.14, 0.16, 0.18 mg/mL). The adsorption equilibrium time was determined by adsorption kinetics experiments. Following the experiment, the adsorption content of RCMs for dencichine in each sample was measured.

To evaluate the thermodynamics of dencichine on the RCMs and RPMs, a series of adsorption tests were carried out, including different temperatures 15, 25, 35, 45 and 55 ◦C.
