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Competition between the effect of particle size and TM-doping on photodegradation of oxytetracycline using Zn0.94M0.06O (M: Mn, Fe, Co, Ni, Cu and Zn) nanoparticles
Reaction Kinetics, Mechanisms and Catalysis ( IF 1.7 ) Pub Date : 2023-08-21 , DOI: 10.1007/s11144-023-02477-x
R. Torkamani , B. Aslibeiki , S. Fathi

The photodegradation of oxytetracycline (OTC) antibiotic by Zn0.94M0.06O (M: Mn, Fe, Co, Ni, Cu and Zn) nanoparticles was investigated using a 100 W visible-light irradiation source. The creation of intrinsic defects, due to doping, reduced the electron–hole recombination and led to a photocatalytic efficiency of 81.65% for pure ZnO sample. The Ni and Cu doped nanoparticles showed the highest (87.50%) and lowest (39.76%) efficiency. The presence of inherent defects in the crystalline structure play an important role in the photocatalytic process, so that in Ni-doped sample, the interstitial zinc and nickel atoms, and oxygen vacancies enhance the degradation efficiency through electron–hole separation. Moreover, the presence of CuO phase eliminated the excitons and dramatically reduced the degradation efficiency in Cu doped sample. On the other hand, the NiO formed in the Ni@ZnO prevented electron–hole recombination and increased photocatalytic efficiency. Besides the doping, the morphology of the samples including surface area and particle size showed a noticeable contribution in the degradation process. The smaller particles showed higher efficiency, while by increasing the size, the degradation efficiency reduced dramatically.



中文翻译:

粒径和 TM 掺杂对 Zn0.94M0.06O(M:Mn、Fe、Co、Ni、Cu 和 Zn)纳米粒子光降解土霉素的影响的竞争

Zn 0.94 M 0.06对土霉素 (OTC) 抗生素的光降解使用 100 W 可见光照射源研究 O(M:Mn、Fe、Co、Ni、Cu 和 Zn)纳米颗粒。由于掺杂而产生的本征缺陷减少了电子-空穴复合,使纯 ZnO 样品的光催化效率达到 81.65%。Ni和Cu掺杂纳米粒子表现出最高(87.50%)和最低(39.76%)的效率。晶体结构中固有缺陷的存在在光催化过程中起着重要作用,因此在镍掺杂样品中,间隙锌和镍原子以及氧空位通过电子空穴分离提高了降解效率。此外,CuO相的存在消除了激子并显着降低了Cu掺杂样品的降解效率。另一方面,Ni@ZnO 中形成的 NiO 阻止了电子-空穴复合并提高了光催化效率。除了掺杂之外,样品的形态(包括表面积和粒径)在降解过程中显示出显着的贡献。较小的颗粒表现出较高的效率,而通过增加尺寸,降解效率急剧降低。

更新日期:2023-08-22
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