Eco-Friendly Coffee Waste-Based Carbon Dots Coupled to ZnBi-Layered Double Hydroxide Heterojunction: Enhanced Control of Interfacial Charge Transfer for Highly Efficient Visible-Light Catalytic Activity

Figure 6

(a) Effect of altering the pH solution (catalyst: 1.0 g/L, 2,4-D: 30 mg/L). (b) Point of zero charge of CDs (2%)-ZnBi₂O₄ by the salt addition method (ΔpH vs. pH_initial). (c) Effect of altering the dose of CDs (2%)-ZnBi₂O₄ (2,4-D: 30 mg/L at a pH of 4.0). (d) Effect of altering the initial 2,4-D concentration (catalyst: 1.0 g/L at a pH of 4.0).

(a)

(b)

(c)

(d)