Synthesis of Hollow ZrO_2 Mesopores Microspheres with Strong Adsorption Capability by the Yeast Bio-Template Route

摘要

In this work, cage-like ZrO_2 and hollow ZrO_2 microspheres with high surface area and strong adsorption capability were successfully synthesized by microwave- ethanol-thermal method using yeasts as bio-template. XRD, SEM, EDS and BET were used to characterize the products. The results show that these micropheres have a size of about 2-3 μm and are composed by ZrO_2 particles of 30-40 nm. The maximum specific surface area of them can reach to 384.780 m~2/g and there are presences of the inhomogeneous mesopores. Moreover, the template can be removed and tetragonal phase ZrO_2 can be obtained without using calcinations, which greatly simplifies the experimental procedure. We also studied the adsorption capability of cage-like ZrO_2 and hollow ZrO_2 microspheres to methyl orange, the highest adsorption percent was up to 99.5%. The adsorption isotherm conforms to Freundlich equation.