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以Zn(AC)2.2H2O为原料,NH3.H2O为络合剂,在NaBH4辅助下140℃水热反应2 h制备出ZnO纳米棒自组装的海胆形结构。采用X射线衍射仪、扫描电镜和透射电镜对产物进行表征。结果表明,海胆形ZnO结构的直径约为3～17μm,它是由直径约为100 nm,长度约为500 nm～3μm范围的ZnO纳米棒自组装而成。提出了ZnO纳米棒自组装海胆形结构的可能生长机理。NaBH4与溶液中的少量H+结合生成H2气泡,ZnO纳米晶吸附在H2的气液界面形成了纳米颗粒自组装的微球,随着反应时间的延长,组装成微球的ZnO纳米颗粒沿[0001]方向取向生长成ZnO纳米棒,最终形成ZnO纳米棒自组装的海胆形颗粒。室温下以海胆形ZnO纳米结构和ZnO纳米棒为光催化剂,以偶氮染料甲基橙作为光催化研究对象,紫外光照70 min,对甲基橙的降解率分别为97%和67%。
Using Zn (AC) 2.2H2O as raw material and NH3.H2O as complexing agent, the sea urchin-like structure of self-assembled ZnO nanorods was prepared by hydrothermal reaction at 140 ℃ with NaBH4 for 2 h. The products were characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The results showed that the diameter of sea urchin-shaped ZnO was about 3 ~ 17μm, which was self-assembled by ZnO nanorods with a diameter of about 100nm and a length of about 500nm ~ 3μm. The possible growth mechanism of self-assembled sea urchin-shaped ZnO nanorods was proposed. The formation of H2 bubbles by the binding of NaBH4 with a small amount of H + in the solution resulted in the formation of self-assembled nanoparticles of nano-particles by the adsorption of ZnO nanocrystals on the gas-liquid interface of H2. With the extension of the reaction time, ZnO nano- ] Oriented growth into ZnO nanorods, the final formation of self-assembled ZnO nanorods sea urchin-shaped particles. Sea urchin-shaped ZnO nanostructures and ZnO nanorods were used as photocatalysts at room temperature. Methyl orange, azo dye, was used as a photocatalyst. The degradation rate of methyl orange was 97% and 67% under UV irradiation for 70 min.