2.6.2. Static Adsorption of Dencichine on RCMs and RPMs

The RPMs were accurately weighed (0.02 ± 0.0002 g) and placed into round 50 mL conical flasks. After adding 20 mL of dencichine solution, it was adsorbed for 5 h in an 80 rpm air constant temperature oscillator at 25 ◦C. The content of dencichine after adsorption was determined by HPLC. The adsorption amount of the RPMs on dencichine was calculated based on the following Equation (4) [17].

$$\mathbf{Q\_e} = \frac{(\mathbf{C\_0} - \mathbf{C\_c}) \times \mathbf{V}}{\mathbf{W}} \tag{4}$$

Here, Qe represents the amount adsorbed (mg/g), Ce represents the equilibrium solution concentration (mg/mL), C0 represents the initial concentration (mg/mL), V represents adsorbed solution volume (mL) and W represents the mass of the RPMs (g).

Similarly, the RCMs were accurately weighed (0.15 ± 0.0001 g) and placed into round 50 mL conical flasks. After adding 20 mL of dencichine solution, it was adsorbed for 5 h in an 80 rpm air constant temperature oscillator at 25 ◦C. The content of dencichine after adsorption was determined by HPLC. The dencichine adsorption amount of the RCMs was calculated based on Equation (4).
