氧空位介导在铈改性活性粘土上活化氧气以产生活性氧物种（ROS），用于在强酸条件下无过氧化氢时降解有机化合物。
Oxygen Vacancy-Mediated Activates Oxygen to Produce Reactive Oxygen Species (ROS) on Ce-Modified Activated Clay for Degradation of Organic Compounds without Hydrogen Peroxide in Strong Acid.
作者信息
Wu Tianming, Cui Jing, Wang Changjiang, Zhang Gong, Li Limin, Qu Yue, Niu Yusheng
机构信息
Institute of Biomedical Engineering, College of Life Sciences, Qingdao University, Qingdao 266071, China.
College of Resources and Environment, Shandong Agricultural University, Taian 271018, China.
出版信息
Nanomaterials (Basel). 2022 Dec 10;12(24):4410. doi: 10.3390/nano12244410.
The treatment of acid wastewater to remove organic matter in acid wastewater and recycle valuable resources has great significance. However, the classical advanced oxidation process (AOPs), such as the Fenton reaction, encountered a bottleneck under the conditions of strong acid. Herein, making use of the oxidation properties of CeAY (CeO@acid clay), we built an AOPs reaction system without HO under a strong acid condition that can realize the transformation of organic matter in industrial wastewater. The X-ray photoelectron spectroscopy (XPS) proved that the CeAY based on Ce as an active center has abundant oxygen vacancies, which can catalyze O to produce reactive oxygen species (ROS). Based on the electron spin-resonance spectroscopy spectrum and radical trapping experiments, the production of •O and •OH can be determined, which are the essential factors of the degradation of organic compounds. In the system of pH = 1.0, when 1 mg CeAY is added to 10 mL of wastewater, the degradation efficiency of an aniline solution with a 5 mg/L effluent concentration is 100%, and that of a benzoic acid solution with a 100 mg/L effluent concentration is 50% after 10 min of reaction. This work may provide novel insights into the removal of organic pollutants in a strong acid water matrix.
处理酸性废水以去除其中的有机物并回收有价值的资源具有重要意义。然而，经典的高级氧化工艺（AOPs），如芬顿反应，在强酸条件下遇到了瓶颈。在此，利用CeAY（CeO@酸性黏土）的氧化性能，我们构建了一个在强酸条件下无需HO的AOPs反应体系，该体系能够实现工业废水中有机物的转化。X射线光电子能谱（XPS）证明，以Ce为活性中心的CeAY具有丰富的氧空位，能够催化O生成活性氧物种（ROS）。基于电子自旋共振光谱和自由基捕获实验，可以确定•O和•OH的产生，它们是有机化合物降解的关键因素。在pH = 1.0的体系中，当向10 mL废水中加入1 mg CeAY时，反应10分钟后，出水浓度为5 mg/L的苯胺溶液的降解效率为100%，出水浓度为100 mg/L的苯甲酸溶液的降解效率为50%。这项工作可能为在强酸水基质中去除有机污染物提供新的见解。
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