Abstract
Porous materials exhibit a superb adsorptive performance owing to the merits of large surface area. In this paper, a novel uniform hollow mesoporous magnesium silicate Mg2Si3O6(OH)4 micro-nanosphere assembled by nanosheets has been prepared by controlling the amount of silica during the hydrothermal reaction. Then a novel nanocomposite for Mg2Si3O6(OH)4/GO was prepared by a facile strategy, in which graphene oxide (GO) serves as the support. This nanocomposite exhibited the highly excellent selective adsorption performance for MB with much higher maximum adsorption capacities of 909.1 mg/g, which is much higher than that of reported adsorbent materials. GO not only effectively avoids agglomeration of Mg2Si3O6(OH)4, but also possesses favorable synergistic adsorption with Mg2Si3O6(OH)4. The adsorption process was found to comply with the pseudo-second-order rate equation and Langmuir adsorption model. The competitive adsorption, the effects of dosage, pH, temperature, ionic strength, adsorption mechanism and recycling performance were also investigated, respectively. Thermodynamic studies showed the adsorption process was endothermic, spontaneous and entropically driven. Considering of the above results in real water treatment and recyclability, this environmental friendly and high-efficient nanocomposite holds a potential application for removal of MB dye pollutant.
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