Engineering Research Center of Nano-Geomaterials of Ministry of Education, China University of Geosciences, Wuhan 430074, China.
Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China.
Inorg Chem. 2023 Mar 27;62(12):4823-4834. doi: 10.1021/acs.inorgchem.2c04059. Epub 2023 Feb 27.
The Fenton-like reaction, as one of the most efficient strategies to generate radical species for the degradation of environmental pollutants, has attracted considerable attention. However, engineering low-cost catalysts with excellent activity by phosphate surface functionalization has seldom been used for the activation of peroxymonosulfate (PMS). Herein, emerging phosphate-functionalized CoO/kaolinite (P-CoO/Kaol) catalysts have been prepared by hydrothermal and phosphorization. Kaolinite nanoclay with rich hydroxyl groups plays a vital role in realizing phosphate functionalization. The results indicate that P-CoO/Kaol shows superior catalytic performance and excellent stability to the degradation of Orange II, which could be attributed to the existence of phosphate that promotes the adsorption of PMS and the electron transfer of Co/Co cycles. Furthermore, the OH radical was identified as the dominating reactive species for the degradation of Orange II compared to the SO radical. This work could offer a novel preparation strategy for emerging functionalized nanoclay-based catalysts for effective pollutant degradation.
芬顿反应作为一种最有效的产生用于降解环境污染物的自由基的策略，引起了相当大的关注。然而，通过磷酸盐表面功能化来工程化具有优异活性的低成本催化剂，很少用于过一硫酸盐（PMS）的活化。在此，通过水热法和磷化法制备了新兴的磷酸盐功能化 CoO/高岭土（P-CoO/Kaol）催化剂。富含羟基的高岭土纳米粘土在实现磷酸盐功能化方面发挥了重要作用。结果表明，P-CoO/Kaol 对橙 II 的降解表现出优异的催化性能和稳定性，这归因于磷酸盐的存在促进了 PMS 的吸附和 Co/Co 循环的电子转移。此外，与 SO 自由基相比，OH 自由基被确定为降解橙 II 的主要反应性物质。这项工作为有效降解污染物的新兴功能化纳米粘土基催化剂的制备提供了一种新的策略。
