Abstract
Two kinds of hierarchical ZnO flower-like porous nanostructures with numerous nanosheets were successfully synthesised through a template-free and low-cost oxalic acid assisted solvothermal method combined with a heat post-treatment. The obtained products were characterised by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). SEM and TEM results revealed that the two kinds of products had sword-like and hydrangea-like nanostructures originating from water and water/alcohol mixture solvents, respectively. XRD results confirmed that the growth process of ZnO involved a phase transformation from intermediate compound zinc oxalate hydroxide to ZnO. Furthermore, the photocatalytic properties were also characterised. The results indicated that both samples exhibited high photocatalytic activities for the degradation of rhodamine B, which were mainly ascribed to the porous hierarchical structures.
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