The decomposed characteristic of nanometer ZnO precursor compound was studied. From the research, the decomposed temperature of nanometer precursor compound of ZnO is about 230 ℃ and it may be completely decompounded...The decomposed characteristic of nanometer ZnO precursor compound was studied. From the research, the decomposed temperature of nanometer precursor compound of ZnO is about 230 ℃ and it may be completely decompounded at 350 ℃. By means of the kinetics theory, the dynamics equation of precursor compound of nanometer ZnO was obtained. Activation energy is approximately 789.83±40 J·mol -1, reaction order is about 3, and pre-exponential factor is 0.0696 mg·s -1.展开更多
A combustion synthesis method was adapted for the efficient preparation ofpure zinc ferrite particles (ZnFe_2O_4). It is based on the exothermic reaction of the correspondingmetal nitrates with a reducing agent, to pr...A combustion synthesis method was adapted for the efficient preparation ofpure zinc ferrite particles (ZnFe_2O_4). It is based on the exothermic reaction of the correspondingmetal nitrates with a reducing agent, to produce extremely fine-grained ashes that readily convertinto pure ZnFe_2O_4 with treating thermally. The composition and microstructure of the so-obtainedsamples were studied by XRD (X-ray powder diffraction), TEM (Transmission Electron Microscopy) andAFM (Atomic Force Microscopy). These results showed that the range of particle size of ZnFe_2O_4 isabout 15-25 nm. Photocatalytic activities of nanometer ZnFe_2O_4 were also evaluated by degradationof the curcumin solution.展开更多
文摘The decomposed characteristic of nanometer ZnO precursor compound was studied. From the research, the decomposed temperature of nanometer precursor compound of ZnO is about 230 ℃ and it may be completely decompounded at 350 ℃. By means of the kinetics theory, the dynamics equation of precursor compound of nanometer ZnO was obtained. Activation energy is approximately 789.83±40 J·mol -1, reaction order is about 3, and pre-exponential factor is 0.0696 mg·s -1.
基金This work was financially supported by the National Natural Science Foundation of China (No.20273051) the Scientific Foundation for returned students of MOE of China, and the Project KJCXGC-01 of Northwest Normal University.]
文摘A combustion synthesis method was adapted for the efficient preparation ofpure zinc ferrite particles (ZnFe_2O_4). It is based on the exothermic reaction of the correspondingmetal nitrates with a reducing agent, to produce extremely fine-grained ashes that readily convertinto pure ZnFe_2O_4 with treating thermally. The composition and microstructure of the so-obtainedsamples were studied by XRD (X-ray powder diffraction), TEM (Transmission Electron Microscopy) andAFM (Atomic Force Microscopy). These results showed that the range of particle size of ZnFe_2O_4 isabout 15-25 nm. Photocatalytic activities of nanometer ZnFe_2O_4 were also evaluated by degradationof the curcumin solution.
