Fabrication synthesis of porous Al2O3 hollow microspheres and its superior adsorption performance for organic dye

• A novel and facile sacrificial template route has been demonstrated to prepare Al2O3 hollow microspheres.
• The route presented was promising to be applied in preparation of other metal oxides.
• The Al2O3 hollow microspheres powder showed superior performance for removal organic dye in aqueous solution.

Al2O3 hollow microspheres with hierarchical pores have been synthesized via a novel sacrificial template process with further calcinations, in which CaMg(CO3)2 microspheres were used as sacrificial templates, and Al(NO3)·9H2O was used as aluminum source. The route is facile and promising to use in preparation of other metal oxides. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), thermogravimetry analysis (TGA), and N2 adsorption/desorption. The Al2O3 hollow microspheres samples showed superior adsorption performance, including rapid adsorption rate, excellent adsorption capacity and good reusability for removal of Congo Red from aqueous solution, which made them attractive in environmental remediation.

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