Fig. 7

Electrochemical degradation efficiency of MB in solution by using CNTs/CF_M as both cathode and anode under various electrolytes and applied currents of A 10, B 50, and C 100 mA. □: 0.1 M KHCO₃; ∆: 0.1 M H₂SO₄. Initial MB concentration of 10 mg L^− 1, initial pH value of the solution of 8.19 and 1.83 for 0.1 M KHCO₃ and 0.1 M H₂SO₄, respectively