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Heterogeneous Activation Of Peroxymonosulfate With Iron-Cobalt Bimetallic Nanocatalysts
Citation:
Yang, Q., H. Choi, S. R. AL-ABED, AND D. D. DIONYSIOU. Heterogeneous Activation Of Peroxymonosulfate With Iron-Cobalt Bimetallic Nanocatalysts. Presented at First-International Conference From Nanoparticles And Nanomaterials To Nanodevices And Nanosystems (IC4N), Halkidiki, GREECE, June 15 - 19, 2008.
Impact/Purpose:
To address the health concerns associated with the adverse effect of dissolved cobalt in water. To investigate a novel approach of using Fe-Co nanocomposites as a mediator for the heterogeneous activation of peroxymonosulfate to generate sulfate radicals for the decompostion of 2,4-dichlorophenol.
Description:
Sulfate radical-based advanced oxidation technologies (SR-AOTs) are attracting considerable attention due to the high oxidizing ability of sulfate radicals (SRs) to degrade various organic pollutants. It was found that SRs could be generated via homogeneous activation of peroxymonosulfate (PMS) with transition metals, among which cobalt is the best activator [1]. However, health concerns associated with the adverse effect of dissolved cobalt in water need to be addressed [2]. In order to respond to current concerns and challenges in SR-AOTs, including i) need of heterogeneous activation of sulfate salts using transition metal oxides, ii) development of nanosize metal oxide catalysts with high catalytic activity and promising leaching properties, and iii) removal and recovery of the catalytic materials after their applications for water and wastewater treatments, the development of a novel approach of using Fe-Co nanocomposites as a mediator for the heterogeneous activation of PMS to generate SRs for the decomposition of 2,4-dichlorophenol was investigated in this study. The physiochemical properties of Fe-Co bimetallic catalysts were characterized using porosimetry, HR-TEM, TPR, XPS and XRD. In addition to effective heterogeneous activation of PMS, the Fe-Co bimetallic catalyst demonstrated remarkably suppressed Co leaching properties due to strong metal-metal interactions. The Fe-Co catalyst possessed unique ferromagnetic properties due to the formation of CoFe2O4, which makes it possible to easily recover and separate the catalyst.