Lang Ran,Yajuan Zheng,Wei Zhang,Xu Zhang,Lingxiao Zhu,Heng Zhang,Quanlin Zhao,Lincheng Zhou,Zhengfang Ye
Background Tetracycline has been widely used to the treatment of diseases caused by bacteria. However, it was inevitably discharged into the water environment during the application process. How to effectively remove Tetracycline is a topic worth studying. Methods Herein, a poly (chloromethyl styrene) based Cu(Ⅱ) and β-CD-doped resin named PS@PPDI-CDP-Cu(Ⅱ) made by a facile adsorption treatment was reported. The structure of PS@PPDI-CDP-Cu(Ⅱ) were characterized by SEM, XPS, and BET. The concentrate of Tetracycline was measured by a UV-visible spectrophotometer. Significant findings It was found that a higher catalytic ability was observed for PS@PPDI-CDP-Cu(Ⅱ) with a rate constant of 0.21 min −1 than Cu(Ⅱ) (0.05 min −1 ) due to the synergistic effect between Cu(Ⅱ) and β-CD, the whole progress was activated by NH 2 OH to form a more integral mechanism than that without NH 2 OH. Tetracycline could be efficiently degraded at a wide pH range from 3.24 to 9.25, PS@PPDI-CDP-Cu(Ⅱ) exhibited an excellent removal efficiency of 100% within 25 min and presented outstanding degradation efficiency over 6 reusable cycles. Compared with our previous work, PS@PPDI-CDP-Cu(Ⅱ) has the advantages of simple synthesis step, and the introduction of synergistic effect between Cu(Ⅱ) and β-CD makes it a better performance of Tetracycline degradation than PCMS@PPDI-CD.
Herein, we converted spent LiFePO 4 battery to the sea urchin-like material (SULM) with a highly efficient and environment-friendly method, which can contribute to building a zero-waste city. With SULM as a Fenton-like catalyst, a highly-efficient degradation process was realized for organic pollutants with interface and solution synergistic effect. In our SULM+NH 2 OH+H 2 O 2 Fenton-like system, NH 2 OH can effectively promote the interface iron ( Fe(Ⅲ)/ Fe(Ⅱ)) and solution iron (Fe(Ⅲ)/Fe(Ⅱ)) redox cycle, thus promoting the generation of reactive oxygen species (ROS). However, the ROS generation process and organic pollutants degradation pathway with the presence of NH 2 OH remains a puzzle. Here the detailed ROS generation mechanism and pollutants degradation pathway have been illustrated carefully based on experimental exploration and characterization. Therein, hydroxyl radicals (·OH) and singlet oxygen ( 1 O 2 ) are the main ROS for oxidizing and degrading organic pollutants. Notably, 1 O 2 can be converted from superoxide radicals (·O 2 ) in SULM+NH 2 OH+H 2 O 2 system. This study not only demonstrates the strategy of "trash-to-treasure" and "waste-to-control-waste" to simultaneously reduce the hazardous release from industrial solid waste and organic wastewater, it also provides new mechanistic insights for NH 2 OH mediated Fenton-like redox system.
危险品化学品经营许可证（带存储）