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. 2023 May 10;9(5):e16178. doi: 10.1016/j.heliyon.2023.e16178

Fig. 14.

Fig. 14

(a) Effect of contact time on the adsorption of methylene blue and (b) The pseudo-second-order adsorption kinetic equation (Fe-γ–CS–SBA-15 0.05 g, [MB] 100 mg/L, pH 9).