Zhang Chao, Yang Hao-Cheng, Wan Ling-Shu, Liang Hong-Qing, Li Hanying, Xu Zhi-Kang
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China.
ACS Appl Mater Interfaces. 2015 Jun 3;7(21):11567-74. doi: 10.1021/acsami.5b02530. Epub 2015 May 21.
Immobilization of photo-Fenton catalysts on porous materials is crucial to the efficiency and stability for water purification. Here we report polydopamine (PDA)-coated porous substrates as a platform for in situ mineralizing β-FeOOH nanorods with enhanced photocatalytic performance under sunlight. The PDA coating plays multiple roles as an adhesive interface, a medium inducing mineral generation, and an electron transfer layer. The mineralized β-FeOOH nanorods perfectly wrap various porous substrates and are stable on the substrates that have a PDA coating. The immobilized β-FeOOH nanorods have been shown to be efficient for degrading dyes in water via a photo-Fenton reaction. The degradation efficiency reaches approximately 100% in 60 min when the reaction was carried out with H2O2 under visible light, and it remains higher than 90% after five cycles. We demonstrate that the PDA coating promotes electron transfer to reduce the electron-hole recombination rate. As a result, the β-FeOOH nanorods wrapped on the PDA-coated substrates show enhanced photocatalytic performance under direct sunlight in the presence of H2O2. Moreover, this versatile platform using porous materials as the substrate is useful in fabricating β-FeOOH nanorods-based membrane reactor for wastewater treatment.
将光芬顿催化剂固定在多孔材料上对于水净化的效率和稳定性至关重要。在此，我们报道了聚多巴胺（PDA）包覆的多孔基底作为原位矿化β-FeOOH纳米棒的平台，其在阳光下具有增强的光催化性能。PDA涂层起到多种作用，如作为粘附界面、诱导矿物生成的介质以及电子转移层。矿化的β-FeOOH纳米棒完美地包裹各种多孔基底，并在具有PDA涂层的基底上保持稳定。已证明固定化的β-FeOOH纳米棒通过光芬顿反应能有效降解水中的染料。当在可见光下与H2O2进行反应时，60分钟内降解效率达到约100%，并且在五个循环后仍高于90%。我们证明PDA涂层促进电子转移以降低电子-空穴复合率。结果，包裹在PDA包覆基底上的β-FeOOH纳米棒在H2O2存在下于直射阳光下显示出增强的光催化性能。此外，这种以多孔材料为基底的通用平台可用于制造用于废水处理的基于β-FeOOH纳米棒的膜反应器。
