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Doping effects of Co2+ ions on ZnO nanorods and their photocatalytic properties

机译：Co2 +离子对ZnO纳米棒的掺杂作用及其光催化性能

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摘要

A series of Zn1-xCoxO nanorods with dopant content ranging from x = 0.00 to 0.10 was prepared by a wet chemical method. All Zn1-xCoxO samples were investigated by x-ray diffraction, transmission electron microscopy, energy-dispersion x-ray line mapping analysis, and UV-visible absorption spectroscopy. It was found that Co2+ ions were homogeneously substituted for Zn2+ ions in ZnO nanorods. Rhodamine B degradation was used as a probe reaction to evaluate the effect of Co2+ doping on ZnO nanorods and photocatalytic performance under UV light and visible light irradiation. Co2+ ions acted as the trapping or recombination centers for electrons and holes, leading to a reduction in photodegradation efficiency under UV light illumination. Alternatively, Co2+ ions enhanced the optical absorption and produced the photoinduced carriers under visible illumination in terms of two charge transfer transitions involving Co2+ ions. Consequently, Co2+ ions substituted in the lattice of ZnO nanorods significantly improved the visible light photocatalytic activity.
机译：通过湿化学方法制备了一系列的Zn1-xCoxO纳米棒，其掺杂剂含量在x = 0.00到0.10之间。所有的Zn1-xCoxO样品均通过X射线衍射，透射电子显微镜，能量色散X射线线图分析和UV-可见吸收光谱进行了研究。发现在ZnO纳米棒中Co2 +离子被Zn2 +离子均匀取代。罗丹明B降解用作探针反应，以评估Co2 +掺杂对ZnO纳米棒的影响以及在紫外光和可见光照射下的光催化性能。 Co 2+离子充当电子和空穴的俘获或复合中心，导致紫外线照射下光降解效率降低。备选地，就涉及Co 2+离子的两个电荷转移跃迁而言，Co 2+离子增强了光吸收并在可见光照射下产生了光诱导的载流子。因此，在ZnO纳米棒的晶格中取代的Co2 +离子显着提高了可见光的光催化活性。

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