Mesoporous Carbon from Optimized Date Stone Hydrochar by Catalytic Hydrothermal Carbonization Using Response Surface Methodology: Application to Dyes Adsorption

Figure 6

(a) Effect of pH (m = 0.005 g, V = 100 mL, t = 4 h, C₀ = 50 mg/L, and T = 25°C). (b) Effect of the AOHC-Ds dose (MB: pH = 5, V = 100 mL, t = 4 h, C₀ = 50 mg/L, T = 25°C MO: pH = 5, V = 100 mL, t = 4 h, C₀ = 50 mg/L, and T = 25°C). (c) Effect of the initial concentration (MB: pH = 8, V = 100 mL, t = 4 h, T = 25°C, m = 0.01 g MO: pH = 5, V = 100 mL, t = 4 h, T = 25°C, and m = 0.01 g). (d) Effect of contact time (MB: pH = 8, V = 100 mL, C₀ = 50 mg/L, T = 25°C, m = 0.01 g MO: pH = 5, V = 100 mL, C₀ = 50 mg/L, T = 25°C, and m = 0.01 g) on the rate of removal of MB and MO.

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