One-pot Synthesis of Novel Composite@Composite-Typed Core@Shell Nanostructures and the Adsorption Property for Dye Wastewater

摘要

In this work, the novel composite@composite-type core@shell nanostructures, i.e. Na_0.5Ce_0.5MoO_4-MoS_2@Na_0.5Ce_0.5MoO_4-MoS_2, have been synthesized via one-pot hydrothermal method. The core and shell are both composed of Na_0.5Ce_0.5MoO_4-MoS_2 but with different mass ratios of Na_0.5Ce_0.5MoO_4 to MoS_2, which are obviously different from the commonly reported core@shell nanostructures with the single-component core and the single- component shell. Besides, it is found that for single dye solution, 20 wt% core@shell sample has an significantly improved adsorption capability for rhodamine B (RhB), but a poor adsorption capability for methyl orange (MO) dye. In RhB- MO mixture solution, the adsorption of RhB has been greatly promoted by MO. In addition, Cr(VI) ion has significantly decreased the adsorption capacity of RhB; meanwhile, K(I) ion can slightly promote MO adsorption. This work provides a simple preparation approach to the new composite-type core@shell nanostructures, and can help us to understand the adsorption processes for practical wastewaters.