Deng Yuanming, Zhao Xiaoman, Luo Junxuan, Wang Zhong, Tang Jiaoning
Shenzhen Key Laboratory of Polymer Science and Technology, Guangdong Research Center for Interfacial Engineering of Functional Materials, College of Materials Science and Engineering, Shenzhen University Shenzhen 518060 China
RSC Adv. 2020 Jan 8;10(4):1858-1869. doi: 10.1039/c9ra09191b.
Here we present a magnetic recyclable photo-Fenton catalyst CoFeO@PPy with uniform morphology and excellent dispersibility prepared simple Fenton oxidization polymerization. The CoFeO core provides good magnetic recyclability for the catalysts as well as the ion source for catalyzed decomposition of HO in PPy coating. The optimal catalytic effect can be obtained by adjusting the ratio of CoFeO and PPy. Methylene blue, Methyl orange and Rhodamine B (RhB) employed as model pollutants certificated that the catalyst exhibits a wide range of photodegradability. The decoloration rates reach nearly 100% in the photodegradation of 10 mg L RhB after 2 h visible-light irradiation and only low toxicity small molecules are detected by LC-MS. Moreover, the catalytic activity remains after 5 cycles with decoloration rates up to 90%. The degradation measurement in the presence of scavengers of reactive species reveals that the positive holes (h) and hydroxyl radical (·OH) are the main reactive oxygen species in the CoFeO@PPy system. The performance enhancement may be attributed to the combination of improved Fenton activity by coordinated Fe and PPy redox pairs and photo-catalytic activity by broaden adsorption and photo-generated charge separation.
在此，我们展示了一种通过简单的芬顿氧化聚合制备的具有均匀形态和优异分散性的磁性可回收光芬顿催化剂CoFeO@PPy。CoFeO核为催化剂提供了良好的磁性可回收性，同时也是PPy涂层中催化分解HO的离子源。通过调整CoFeO和PPy的比例可获得最佳催化效果。以亚甲基蓝、甲基橙和罗丹明B（RhB）作为模型污染物，证明该催化剂具有广泛的光降解性。在可见光照射2小时后，10 mg L RhB的光降解脱色率接近100%，通过LC-MS检测仅发现低毒性小分子。此外，经过5次循环后催化活性依然存在，脱色率高达90%。在存在活性物种清除剂的情况下进行的降解测量表明，正空穴（h）和羟基自由基（·OH）是CoFeO@PPy体系中的主要活性氧物种。性能的提高可能归因于配位的Fe和PPy氧化还原对提高了芬顿活性以及通过拓宽吸附和光生电荷分离提高了光催化活性的结合。
