Investigating Methylene Blue Removal from Aqueous Solution by Cysteine-Functionalized Mesoporous Silica

Figure 10

Kinetic models of MB removal by MSNs-Cys: (a–c) pseudo-first-order reactions at pH 1.5, 7, and 8.5, respectively; (d–f) pseudo-second-order reactions at pH 1.5, 7, and 8.5, respectively (150 ppm, 25°C, and 150 rpm).

(a)

(b)

(c)

(d)

(e)

(f)