Synthesis of nano-porous Bi2WO6 hierarchical microcrystal with selective adsorption for cationic dyes

Abstract Novel three-dimensional spherical porous-Bi 2 WO 6 microcrystals were synthesized via a facile hydrothermal method. In order to investigate its adsorption properties, three kind of dyes, such as rhodamine B(RhB), methyl-blue(MB) and methyl-orange(MO) were selected as model pollutant to evaluate its preferential adsorption property. The static adsorption test shows that the as-prepared spherical porous-Bi 2 WO 6 microcrystal possesses higher adsorptivity for the adsorption of MB than that of RhB and CR. According to a series of dynamic and thermodynamic analysis, the adsorption process conforms to the pseudo-second-order kinetic model and Langmuir isotherm model well. Furthermore, adsorption property of RhB, MB, MO, AR, Ph, p-NPh and 2,4-DNPh on Bi 2 WO 6 was also compared and a plausible mechanism of the preferential adsorption property of three-dimensional spherical porous-Bi 2 WO 6 microcrystal was also discussed according to its structure. It is believed that the as-prepared porous-Bi 2 WO 6 microcrystal may provide potential applications in environmental fields.