Abstract
Abstract Stabilized spherical hollow zirconia was fabricated using calcium carbonate as template through a simple precipitation method. The as-prepared products were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM) and nitrogen adsorption–desorption isotherms (BET). Adsorption performance of the as-prepared products toward Congo red (CR) aqueous solutions was tested and discussed. Results show that the prepared hollow ZrO2 microspheres after calcination displayed tetragonal crystalline reflection peaks and copied the morphology of CaCO3 template very well with a diameter of ∼ 1 μm, and the amount of zirconium n-Butoxide and reaction time play important roles in the formation of special morphology and structure. A possible formation mechanism was proposed according to the observed results. The as-prepared hollow ZrO2 microspheres after calcination exhibit much better adsorption performance for CR aqueous solutions compared with hollow ZrO2 microspheres before calcination and ZrO2 nanoparticles fabricated without template through the same method due to their crystalline structure and large specific surface area.
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