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论文类型： 期刊论文

发表时间： 2012-02-09

发表刊物： JOURNAL OF PHYSICAL CHEMISTRY C

收录刊物： SCIE、EI、Scopus

卷号： 116

期号： 5

页面范围： 3623-3634

ISSN号： 1932-7447

摘要： Iron oxyhydroxide (FeOOH) as heterogeneous catalyst has been widely used in Fenton-like advanced oxidation processes due to its attractive properties such as wide-operating pH range and controllable iron leaching into solution. However, little is known about the Fe3+/Fe2+ transformation of supported FeOOH catalyst under the external electrical field condition, which is of the essence in electro-Fenton-like oxidation reactions. In this study, activated carbon-supported nano-FeOOH (FeOOH/AC) catalysts were prepared by the air oxidation of ferrous hydroxide suspension method. The as-prepared catalyst was characterized with various characterization techniques and identified as goethite and lepidocrocite mixed crystals. Adsorption and electrochemically assisted oxidation of amaranth with the FeOOH/AC heterogeneous catalysts were investigated at pH 4.0 using graphite felt as cathode. Under weak acidic and external electric field conditions, the supported nano-FeOOH catalyst undergoes proton-promoted dissolution and electrochemical reductive dissolution processes, which facilitates Fe3+/Fe2+ transformation and produces a beneficial enhancement of the heterogeneous/homogeneous electro-Fenton reaction rates. Experimental results demonstrated that the FeOOH/AC heterogeneous catalyst possesses admirable adsorbability, and the electrochemically assisted oxidation of amaranth takes place not only through the heterogeneous Fenton reaction on catalyst/solution interface but also through the homogeneous Fenton reaction in bulk solution due to iron liberation from the supported nano-FeOOH. In addition, a possible electrochemically assisted oxidation mechanism is also proposed.