Key Laboratory for Colloid & Interface Chemistry of Education Ministry, Department of Chemistry, Shandong University, Jinan 250100, PR China.
Shandong Academy of Occupational Health and Occupational Medicine, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan 250062, PR China.
J Hazard Mater. 2020 Jul 15;394:122528. doi: 10.1016/j.jhazmat.2020.122528. Epub 2020 Mar 12.
In this study, superparamagnetic β-CD-MnFeO with a large surface area was synthesized via a facile co-precipitation method, with β-cyclodextrin (β-CD) acting as a coating agent. The as-prepared β-CD-MnFeO exhibited better catalytic performance than bare MnFeO in terms of activating peroxymonosulfate (PMS) to degrade 2,4-dichlorophenol (2,4-DCP) over a broad pH range of 5-11. Electron spin resonance spectroscopy (ESR) and free radical quenching experiments indicate that various active species (SO/OH/O/O) are generated in the β-CD-MnFeO/PMS system and that pollutants trapped in the cyclodextrin cavity are quickly degraded. Various reaction parameters of the β-CD-MnFeO/PMS system and the stability of β-CD-MnFeO were also investigated. The results indicate that β-CD-MnFeO is promising for use in water purification owing to its excellent magnetic separation and recovery properties and good resistance to humic acid (HA).
在这项研究中，通过简便的共沉淀法合成了具有大表面积的超顺磁 β-CD-MnFeO，其中β-环糊精（β-CD）作为包覆剂。与 bare MnFeO 相比，所制备的 β-CD-MnFeO 在较宽的 pH 值范围（5-11）内激活过一硫酸盐（PMS）降解 2,4-二氯苯酚（2,4-DCP）时表现出更好的催化性能。电子自旋共振光谱（ESR）和自由基猝灭实验表明，在 β-CD-MnFeO/PMS 体系中生成了各种活性物质（SO/OH/O/O），并且被环糊精腔捕获的污染物被迅速降解。还研究了 β-CD-MnFeO/PMS 体系的各种反应参数和 β-CD-MnFeO 的稳定性。结果表明，由于具有优异的磁分离和回收性能以及良好的抗腐殖酸（HA）能力，β-CD-MnFeO 有望用于水净化。
