Institute of Chemicobiology and Functional Materials, School of Chemical Engineering, Nanjing University of Science and Technology, 200 Xiao Ling Wei, Nanjing, 210094, China.
Institute of Chemicobiology and Functional Materials, School of Chemical Engineering, Nanjing University of Science and Technology, 200 Xiao Ling Wei, Nanjing, 210094, China.
J Hazard Mater. 2020 Jun 15;392:122331. doi: 10.1016/j.jhazmat.2020.122331. Epub 2020 Feb 17.
The emergence of more and more persistent organic molecules as contaminants in water simulates research towards the development of more advanced technologies, among which photocatalysis is a feasible choice. However, it is still challenging to design a photocatalyst that fulfills all the requirements for industrial application, i.e., active under visible-light irradiation, shape with handy convenience, highly uniform distribution of active sites, substrate with excellent electronic properties, etc. In this study, we report an attempt to solve these issues at once by designing a film-like photocatalyst with uniform distribution of nitrogen-doped ZnO nanoparticles along nitrogen-doped carbon ultrafine nanofibers with three-dimensional interconnected structure. Under visible-light irradiation, the product exhibited remarkable reactivity for the degradation of two model pollutants tetracycline hydrochloride and 2,4-dichlorophenol within 100 min. The cyclic experiments demonstrated only a slight loss (ca. 5 %) of reactivity after five consecutive photocatalytic reactions. We also investigated the detailed relationship between the structural features and the superior properties of this product, as well as the degradation mechanisms. The convenient shape of the product with excellent performances for the treatment of real polluted water increases its suitability for larger scale application. Our work provides a rational design of photocatalysts for environmental remediation.
越来越多的持久性有机污染物作为水中污染物的出现，模拟了对开发更先进技术的研究，其中光催化是一种可行的选择。然而，设计一种满足工业应用所有要求的光催化剂仍然具有挑战性，即能在可见光照射下有效、形状方便、活性位点分布高度均匀、基底具有优异的电子性能等。在这项研究中，我们试图通过设计一种具有均匀分布的氮掺杂 ZnO 纳米颗粒的薄膜状光催化剂来解决这些问题，该光催化剂沿着具有三维互联结构的氮掺杂碳超细纳米纤维分布。在可见光照射下，该产物对两种模型污染物盐酸四环素和 2,4-二氯苯酚的降解在 100 分钟内表现出显著的反应活性。循环实验表明，在连续五次光催化反应后，反应活性仅略有下降（约 5%）。我们还研究了该产物结构特征与优异性能之间的详细关系，以及降解机制。该产物具有良好的处理实际污染水的性能，形状方便，增加了其在更大规模应用中的适用性。我们的工作为环境修复提供了一种合理的光催化剂设计。
