Synthesis and Photocatalysis of Monodispersed Zinc Oxide Powders with Different Morphologies.

Abstract

SYNOPSISZnO powders with different morphologies were synthesized by alkali precipitation method , organometallic zinc hydrolysis, and spray pyrolysis.Acetaldehyde decomposition was used as a probe reaction to evaluate the photocatalysis of these ZnO powders. The relationship between photocatalytic activity and crystallinity, surface area, or morphology was investigated. The results indicate that the photocatalytic activity depends on crystallinity , rather than surface area, for the same kind of ZnO particles. However, no direct relationship between photocatalytic activity and crystallinity or surface area was found for the different kinds of ZnO particles . Instead, we find that the particle morphology significantly affects its photocatalysis.

Simple fabrication and photocatalytic activity of ZnO particles with different morphologies

“…Li et al [31,32] have previously reported photocatalytic activity of a ZnO sample mainly determined by its particle morphology rather than the BET surface area or crystallinity if the sample originates from the different methods or the same method but different conditions. That is because the photocatalytic activity of ZnO particles strongly depend on some specific exposed crystal faces [47,48], while the exposed crystal faces or the ratios among exposed crystal faces are noticeably different for the ZnO particles with different morphologies; the more the specific sites are, the more active ZnO becomes [49,50].…”

“…However, the studies concerning effect of monodispersed ZnO morphology and size on its photocatalysis are very scarce. Li et al [31][32][33] have investigated the relationship between photocatalytic activity and crystallinity, surface area, morphology of ZnO particles in detail. They found the photocatalysis of ZnO powder depends on crystallinity for the same original ZnO samples and on the particle morphology for the differently original ZnO samples.…”

Manganese-Doped Zinc Oxide Nanostructures as Potential Scaffold for Photocatalytic and Fluorescence Sensing Applications

“…The crystalline size, specific surface area, morphologies, and textures are the most important factors that determine the photocatalytic performances of a catalyst [59]. Among these factors, the structural morphology generates a vital impact on the photocatalytic performance, as the photocatalytic activity depends on some specific exposed crystal faces [60]. As the exposed surfaces of each nanostructure vary with their morphologies, hence, Mn-doped ZnO becomes a more active photocatalyst, if it has more specific sites.…”

Structural, morphological and optical studies of sol-gel engineered Sm3+ activated ZnO thin films for photocatalytic applications

“…It was noted that the absorption peak of AR dye decreases, indicates the deterioration of AR molecules Langmuir-Hinshelwood kinetics model was used to degradation of AR dye and its kinetics are represented as ln (C/Co) = −kt, Where k be the rate of constant apparent reaction, C be the AR initial concentration, t be the reaction time and Co be the concentration of AR dye with t, and the obtained kinetics values prepared material is given in Table 2 [21][22][23][24][25]. The improved catalytic activity was noted for 7 mol % doped ZnO:Sm 3+ catalyst under UV light was observed due to charges carried while separation, which is attributed to the overload production of absorption band shift and radicals hydroxyl to higher wavelengths.…”