Fujian Engineering Research Center of Functional Materials, Yishan Campus, Fuzhou University, Fuzhou, Fujian, China.
J Hazard Mater. 2012 May 30;217-218:100-6. doi: 10.1016/j.jhazmat.2012.02.074. Epub 2012 Mar 8.
An oriented hierarchical ZnO flower-rod arrays (FRs) were prepared on indium doped tin oxide (ITO) glass using a facile solution-based method assisted with ZnO seed layer. And the as-prepared ZnO FRs/ITO was used as a convenient photocatalytic device that recycled without centrifugation. The results show that ZnO FRs are wurtzite phase with single crystalline grown along the [001] direction. The photoluminescence (PL) spectra illustrate that there are more oxygen vacancies on the surface of ZnO FRs compared with ZnO nanoparticles (NPs). The electrochemical methods using Rhodamine B (RhB) as electrolyte are also performed to study on the photodegradation mechanism where RhB is acted as photocatalytic substrate. For ZnO FRs, the higher photoinduced currents under UV irradiation and current density prove that the recombination of electron-hole pairs is restrained with oxygen vacancies, and the lower charge transfer resistance suggest that the charges could move quickly through ZnO oriented structures. Therefore, the photocatalytic activity is enhanced by ZnO FRs compared with ZnO NPs, and RhB degradation efficiency of ZnO FRs photocatalysts is nearly 100% by UV irradiation for 1.5h.
采用简便的基于溶液的方法，在掺锡氧化铟（ITO）玻璃上制备了取向的分层氧化锌花-棒阵列（FRs），并辅助氧化锌种子层。所制备的 ZnO FRs/ITO 被用作一种方便的光催化装置，无需离心即可回收。结果表明，ZnO FRs 为纤锌矿相，沿[001]方向单晶生长。光致发光（PL）谱表明，与氧化锌纳米粒子（NPs）相比，ZnO FRs 的表面有更多的氧空位。还使用电化学方法（以罗丹明 B（RhB）为电解质）研究光降解机理，其中 RhB 作为光催化底物。对于 ZnO FRs，在紫外光照射下，光致电流更高，电流密度证明电子-空穴对的复合受到氧空位的抑制，而电荷转移电阻较低则表明电荷可以通过 ZnO 定向结构快速移动。因此，与 ZnO NPs 相比，ZnO FRs 的光催化活性得到增强，ZnO FRs 光催化剂在 1.5 小时的紫外光照射下，RhB 的降解效率接近 100%。
