Department of Chemical Engineering, Sathyabama Institute of Science and Technology, Chennai, 119, India.
Department of Chemical Engineering, Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam, 603110, Tamil Nadu, India; Centre of Excellence in Water Research (CEWAR), Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam, 603 110, Tamil Nadu, India; Department of Biotechnology Engineering and Food Technology, Chandigarh University, Mohali 140413, India.
J Environ Manage. 2023 Oct 15;344:118614. doi: 10.1016/j.jenvman.2023.118614. Epub 2023 Jul 14.
In recent periods, a broad assortment of continual organic contaminants has been released into our natural water resources. Indeed, it is exceedingly poisonous and perilous to living things; thus, the elimination of these organic pollutants before release into the water bodies is vital. A variety of techniques have been utilized to remove these organic pollutants with advanced oxidation photocatalytic methods with zinc oxide (ZnO) nanoparticles being commonly used as a capable catalyst for contaminated water treatment. Nevertheless, its broad energy gap, which can be only stimulated under an ultraviolet (UV) light source, and high recombination pairs of electrons and holes limit their photocatalytic behaviors. However, numerous methods have been suggested to decrease its energy gap for visible regions. Including, the doping ZnO with metal ions (dopant) can be considered as an effectual route not only the reason for a movement of the absorption edges toward the higher (visible light) region but also to lower the electron-hole pair (e-h) recombination. This review concentrated on the impact of dissimilar types of metal ions (dopants) on the advancement in the degradation performance of ZnO. So, this work demonstrates a vital review of contemporary attainments in the alteration of ZnO nanoparticles for organic pollutants eliminations. Besides, the effect of doping ions including transition metals, rare earth metals, and metal ions (substitutional and interstitial) concerning numerous types of altered ZnO are summarized. The photodegradation mechanisms for pristine and metal-modified ZnO nanoparticles are also conferred.
在最近的时期，大量的持续性有机污染物已经被释放到我们的自然水资源中。事实上，这些有机污染物对生物是非常有毒和危险的；因此，在将这些有机污染物排放到水体之前将其清除是至关重要的。已经使用了各种技术来去除这些有机污染物，其中高级氧化光催化方法中常用氧化锌 (ZnO) 纳米粒子作为处理受污染水的有效催化剂。然而，其较宽的能隙，只能在紫外 (UV) 光源下激发，以及电子和空穴的高复合对限制了其光催化行为。然而，已经提出了许多方法来降低其对可见光区域的能隙。包括，用金属离子（掺杂剂）掺杂 ZnO 可以被认为是一种有效的途径，不仅可以使吸收边缘向更高（可见光）区域移动，而且可以降低电子-空穴对 (e-h) 的复合。本综述集中讨论了不同类型的金属离子（掺杂剂）对 ZnO 光催化性能的影响。因此，这项工作展示了 ZnO 纳米粒子改性用于有机污染物去除的当代成就的重要综述。此外，还总结了掺杂离子（包括过渡金属、稀土金属以及替代和间隙金属离子）对各种改性 ZnO 的影响。还介绍了原始和金属修饰的 ZnO 纳米粒子的光降解机制。
