Coordination bonds of ligands and metal ions are generally considered for improving agglomeration during the synthesis of metal oxides . However, the strong interactions always limit the performance due to the requirement of additional energy and calcination . A new strategy of synthesizing ZnO particles is proposed through a hydrothermal inducing redox method by using 2-methyl imidazole and Zn(NO 3 ) 2 . In situ direct redox between this organic ligand and NO 3 − in a hydrothermal condition is confirmed radical change instead of the simple coordination between organic ligands with Zn 2+ in traditional method. The directly acquired ZnO particles possessing uniform dumbbell-like morphology have no obvious agglomeration. The yield reaches >95%. In particular, the synthesis mechanism and morphology evolution during the ZnO aggregates growth were carefully explored and proposed. Density functional theory (DFT) and surface energy calculations demonstrated the effects of activity variation of reactive groups and preferred growth surface of ZnO crystals. This work gives new insights into new synthesis strategy of ZnO particles via hydrothermal condition.
Novel ZnO particles with hierarchical and biomorphic porous microstructures were first synthesized through a bionic method and the individual ZnO, pine cones-like ZnO/rGO composites were prepared via ‘one-pot’ solvothermal route. All of above samples are characterized by SEM, XRD, Raman spectrometer and XPS. The results of degradation of rhodamine B indicated that ZnO/leaf exhibited better photocatalytic properties than individual ZnO, the ZnO/rGO with ZnO/rGO ratios at 20:1 shows the best photocatalytic performance. Results indicate that both the morphology design of ZnO through a bionic method and graphene doping can enhance the photocatalytic performance of zinc oxide.
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