Both porous and scale-like wall zirconia
(ZrO2) hollow
microspheres were successfully prepared through a facile and mild
microwave solvothermal method using the rape pollen as biotemplates.
The formation mechanisms were discussed for both ZrO2 hollow
microspheres fabricated using pollen biotemplate with different pollen
treatments. The porous ZrO2 hollow microspheres had a specific
surface area of 40.92 m2·g–1, significantly
higher than scale-like wall ZrO2 hollow microspheres (24.79
m2·g–1) and ZrO2 particles
(27.99 m2·g–1). The adsorption test
results showed that porous ZrO2 hollow microspheres had
a higher adsorption capability (96.98 g·mg–1) than scale-like wall ZrO2 hollow microspheres (38.55
g·mg–1) and ZrO2 particles (32.03
g·mg–1) for Congo red. The adsorption followed
pseudo-second-order kinetics, and the adsorption process was homogeneous
adsorption of monolayer.
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