A novel metal foam-based Fenton-like process for wastewater treatment is illustrated in this study. In the system, HO was generated in situ by taking advantage of O in air, as metal could activate dissolved O to produce O and then generate HO. Furthermore, metal foam can enhance the Fe/Fe cycling, which eventually improved the efficiency of the Fenton process. The performance of the novel Fenton-like process was assessed by methyl blue (MB), and 94% MB removal could be achieved within 5 min in nickel (Ni) foam system. The degradation of MB in this study was based on both OH and O radicals, where O radical served as the precursor to generate OH for MB degradation through a Fenton process. The pH value of 3 with the initial Fe concentration of 0.25 mM was found to be the optimum condition for the Fenton-like process. This study provides a general and new strategy for efficient wastewater treatment just using aeration and metal foams (such as Ni, Al, and Cu foams), which also offers a good alternative for rational design and application of traditional Fenton process.
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| http://dx.doi.org/10.1021/acsomega.7b00977 | DOI Listing |
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