Abstract In this study, different morphologies of zinc oxide (ZnO) powders were obtained via solution combustion route using poly(vinyl-pyrrolidone) (PVP) as fuel at various fuel to oxidant ratios. The increase of fuel amounts led to the transformation of giant pyramid-like particles to hexagonal nano-disk ones. N2 adsorption-desorption isotherms showed that the specific surface area increased from 23 to 41 m2/g at the higher fuel contents. By considering the decrease of particle size, the band gap energy value was turned from 3.02 to 3.13 eV. The ZnO powders prepared at a fuel to oxidant ratio of 1.5 photodegraded about 69 % of methylene blue during 3 h ultraviolet light irradiation. The high photocatalytic activity was attributed to the low recombination rate of electron-hole pairs and the high specific surface area.

中文翻译：

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通过溶液燃烧合成不同形态的 ZnO：燃料的作用

摘要 在本研究中，使用聚乙烯吡咯烷酮 (PVP) 作为燃料，在不同燃料与氧化剂的比例下，通过溶液燃烧途径获得了不同形态的氧化锌 (ZnO) 粉末。燃料量的增加导致巨大的金字塔状颗粒转变为六边形纳米盘状颗粒。N2 吸附-解吸等温线表明，在较高的燃料含量下，比表面积从 23 增加到 41 m2/g。通过考虑粒径的减小，带隙能量值从 3.02 eV 变为 3.13 eV。在 3 小时紫外光照射期间，以 1.5 的燃料与氧化剂比制备的 ZnO 粉末光降解约 69% 的亚甲蓝。高光催化活性归因于电子-空穴对的低复合率和高比表面积。