Synthesis of flower-like and hexagonal flake-like ZnO using microwave method and their photocatalytic activity

Micro & nano letters

article

Wei Si¹  Liran Pei¹ 

[1] School of Materials Science and Engineering, Dalian Jiaotong University

关键词: X-ray diffraction;    nanofabrication;    semiconductor growth;    scanning electron microscopy;    zinc compounds;    ultraviolet radiation effects;    visible spectra;    wide band gap semiconductors;    ultraviolet spectra;    transmission electron microscopy;    photoluminescence;    II-VI semiconductors;    photocatalysis;    photocatalysts;    crystal microstructure;    hexagonal flake-like ZnO;    photocatalytic activity;    aqueous solution;    UV light irradiation;    sodium hydroxide;    microwave power;    ultraviolet light irradiation;    methyl orange;    hexagonal flake-like ZnO microstructures;    flower-like ZnO microstructures;    photoluminescence;    X-ray diffraction;    high-resolution transmission electron microscopy;    scanning electron microscopy;    microwave method;    time 150.0 min;    power 231.0 W;    time 120.0 min;    ZnO;   

DOI  :  10.1049/mnl.2020.0259

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

The flower-like and hexagonal flake-like ZnO microstructures were synthesised by a microwave method using ammonia water and sodium hydroxide as precipitant, respectively. The products were characterised by scanning electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction and photoluminescence. The photocatalytic activity of the flower-like and hexagonal flake-like ZnO microstructures was evaluated by the degradation of methyl orange (MO) under ultraviolet (UV) light irradiation. The results indicated that the best flower-like ZnO microstructure was obtained when the experimental conditions were [Zn 2+ ] = 0.025 mol l −1 , [Zn 2+ ]:[NH 3 ·H 2 O] = 1:1.5, microwave power = 231 W. Under the same reaction conditions, hexagonal flake-like ZnO can be obtained by using sodium hydroxide as precipitant. The MO in aqueous solution was completely eliminated by flower-like ZnO after 120 min of UV light irradiation. Under identical conditions, the degradation of MO in aqueous solution was completely finished within 150 min in the presence of hexagonal flake-like ZnO. The flower-like ZnO sample showed an enhanced photocatalytic activity compared with the hexagonal flake-like ZnO for the MO degradation, which could be attributed to the presence of more active centres and hence can have more opportunities to contact with MO molecules.

【 授权许可】

CC BY|CC BY-ND|CC BY-NC|CC BY-NC-ND