Size-selective trapping and photocatalytic degradation of PFOA in Fe-modified zeolite frameworks
Author
Bai, Lu
Zhiqun, Xie
Shang, Yanan
Saad, Ali
González Olmos, Rafael
Wong, Michael S.
Other authors
Universitat Ramon Llull. IQS
Publication date
2024-03-01ISSN
0926-3373
Abstract
Removal and destruction of perfluorooctanoic acid (PFOA) are challenging due to its extreme persistence and dilute concentrations. This study investigated dual-function adsorptive-photocatalytic zeolite materials to selectively adsorb and degrade PFOA via tuning pore structures and doping transition metals. It is found that the pore opening is critical in the size-selective trapping of PFOA, while the iron doped zeolites present excellent adsorption of PFOA (>80 mg g−1) combining hydrophobic and electrostatic interactions. The formation of PFOA-iron complexes has reduced bond dissociation energy of C−F, calculated from density functional theory, for favorable stepwise defluorination (over 60% defluorination in 4 hours) by superoxide radicals and ligand-to-metal charge transfer. This mechanistic investigation extends the potential of the concentrate-and-degrade concept to remove PFOA selectively and effectively from contaminated water.
Document Type
Article
Document version
Published version
Language
English
Subject (CDU)
544 - Physical chemistry
66 - Chemical technology. Chemical and related industries
Keywords
Zeolite frameworks
Fe doping
Size-selective trapping
Pore opening
Concentrate-and-degrade
Pages
12 p.
Publisher
Elsevier
Is part of
Applied Catalysis B: Environment and Energy. 2024;349:123885
This item appears in the following Collection(s)
Rights
© L'autor/a
Except where otherwise noted, this item's license is described as http://creativecommons.org/licenses/by/4.0/