JCIS 386-2012-307

Amino modified mesostructured silica nanoparticles for efficient adsorption
of methylene blue

In this work, mesostructured silica nanoparticles (MSNAP) with high adsorptivity were prepared by a
modification with 3-aminopropyl triethoxysilane (APTES) as a pore expander. The performance of the
MSNAP was tested by the adsorption of MB in a batch system under varying pH (2–11), adsorbent dosage
(0.1–0.5 g L1), and initial MB concentration (5–60 mg L1). The best conditions were achieved at pH 7
when using 0.1 g L1 MSNAP and 60 mg L1MB to give a maximum monolayer adsorption capacity of
500.1 mg g1 at 303 K. The equilibrium data were evaluated using the Langmuir, Freundlich, Temkin,
and Harkins–Jura isotherms and fit well to the Freundlich isotherm model. The adsorption kinetics
was best described by the pseudo-second order model. The results indicate the potential for a new use
of mesostructured materials as an effective adsorbent for MB.