Fig. 14

(a) Comparison of the MB removal rate without any catalyst and using MWCNT and MWCNT@g-C₃N₄@Ag under the optimum conditions, (b) effects of synthesized photocatalysts on the MB removal at different concentrations under the conditions: photocatalyst amount = 0.5 g/L, pH = 7, and reaction time = 180 min.