*2.7. Removal and Adoption Capacity Performance of Ag<sup>+</sup>*

The removal and adoption capacity performance of Ag<sup>+</sup> testing was determined in a centrifuge tube, for different concentrations of AgNO3, after shaking well.

The removal activities can be evaluated by the following equation: The removal and adoption capacity performance of Ag<sup>+</sup> testing was determined in a centrifuge tube, for different concentrations of AgNO3, after shaking well.

*Coatings* **2023**, *13*, x FOR PEER REVIEW 4 of 15

*2.7. Removal and Adoption Capacity Performance of Ag<sup>+</sup>*

$$\mathcal{R} = \frac{\mathbf{C}\_0 - \mathbf{C}\_1}{\mathbf{C}\_0} \times 100\% \tag{1}$$

C<sup>1</sup> is the final concentration of Ag<sup>+</sup> , and C<sup>0</sup> is the initial concentration of Ag<sup>+</sup> ions. The concentration of Ag<sup>+</sup> ions was analyzed via AAS. C<sup>1</sup> is the final concentration of Ag<sup>+</sup> , and C<sup>0</sup> is the initial concentration of Ag<sup>+</sup> ions. The concentration of Ag<sup>+</sup> ions was analyzed via AAS.

The adsorption amount of Ag<sup>+</sup> (Q mg/g) can be calculated according to the following equation: The adsorption amount of Ag<sup>+</sup> (Q mg/g) can be calculated according to the following equation:

$$\mathbf{Q\_e} = \frac{(\mathbf{C\_0} - \mathbf{C\_1})\mathbf{V}}{\mathbf{m}} \tag{2}$$

Q<sup>e</sup> is the adsorption capacity (mg·g −1 ), C<sup>0</sup> and C<sup>e</sup> are the initial and equilibrium concentrations of Ag<sup>+</sup> (mg·L −1 ), respectively, V is the volume of the metal ion solution (L), and m is the Fe3O4@ZnS@MPS mass (g). Q<sup>e</sup> is the adsorption capacity (mg·g−1), C<sup>0</sup> and C<sup>e</sup> are the initial and equilibrium concentrations of Ag<sup>+</sup> (mg·L−1), respectively, V is the volume of the metal ion solution (L), and m is the Fe3O4@ZnS@MPS mass (g).

#### **3. Results and Discussion 3. Results and Discussion**
