Size-selective trapping and photocatalytic degradation of PFOA in Fe-modified zeolite frameworks

Jan Max Arana Juve, Xavier Baami González, Lu Bai, Zhiqun Xie, Yanan Shang, Ali Saad, Rafael Gonzalez-Olmos, Michael S. Wong, Mohamed Ateia, Zongsu Wei

Producció científica: Article en revista indexadaArticleAvaluat per experts


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.

Idioma originalAnglès
Número d’article123885
RevistaApplied Catalysis B: Environmental
Estat de la publicacióPublicada - 15 de jul. 2024


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