Fig. 4. (a) Removal efficiency of different amounts of MB on various doses of CTC (1 g, 2 g, 3 g, 4 g, and 5 g; MB concentration: 10 mg L⁻¹). (b) Effect of solution pH on fast water treatment (CTC dose: 4 g, MB concentration: 100 mg L⁻¹). (c) Effect of number of water cycles on fast water treatment (CTC dose: 4 g, MB concentration: 10 mg L⁻¹). (d) Effect of ratios of MB amount in wastewater to weight of CTC (MB concentration: 10 mg L⁻¹).