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Oxidizing Capacity of Periodate Activated with Iron-Based Bimetallic Nanoparticles

机译：铁基双金属纳米粒子活化的高碘酸盐的氧化能力

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摘要

Nanosized zerovalent iron (nFe~0) loaded with a secondary metal such as Ni or Cu on its surface was demonstrated to effectively activate periodate (IO_4~-) and degrade selected organic compounds at neutral pH. The degradation was accompanied by a stoichiometric conversion of IO_4~- to iodate (IO_3~-). nFe~0 without bimetallic loading led to similar IO_4~- reduction but no organic degradation, suggesting the production of reactive iodine intermediate only when IO_4~- is activated by bimetallic nFe~0 (e.g., nFe~0-Ni and nFe~0-Cu). The organic degradation kinetics in the nFe~0-Ni(or Cu)/IO_4~- system was substrate dependent: 4-chlorophenol, phenol, and bisphenol A were effectively degraded, whereas little or no degradation was observed with benzoic acid, carbamazepine, and 2,4,6-trichlorophenol. The substrate specificity, further confirmed by little kinetic inhibition with background organic matter, implies the selective nature of oxidant in the nFe~0-Ni(or Cu)/IO_4~- system. The comparison with the photoactivated IO_4~- system, in which iodyl radical (IO_3~*) is a predominant oxidant in the presence of methanol, suggests IO_3~* also as primary oxidant in the nFe~0-Ni(or Cu)/IO_4~- system.
机译：纳米级零价铁（nFe〜0）的表面负载有诸如Ni或Cu的二次金属，可在中性pH下有效活化高碘酸盐（IO_4〜-）并降解所选的有机化合物。降解伴随着IO_4〜-到碘酸盐（IO_3〜-）的化学计量转换。没有双金属负载的nFe〜0导致类似的IO_4〜-还原，但没有有机降解，这表明只有当IO_4〜-被双金属nFe〜0活化时（例如nFe〜0-Ni和nFe〜0-）才产生反应性碘中间体。铜）。 nFe〜0-Ni（或Cu）/ IO_4〜-体系中的有机降解动力学取决于底物：4-氯苯酚，苯酚和双酚A被有效降解，而苯甲酸，卡马西平，和2,4,6-三氯苯酚。底物专一性由背景有机物几乎没有动力学抑制作用进一步证实，暗示了氧化剂在nFe〜0-Ni（或Cu）/ IO_4〜-系统中的选择性。与光活化的IO_4〜-系统的比较（其中碘基（IO_3〜*）是甲醇存在下的主要氧化剂）表明IO_3〜*在nFe〜0-Ni（或Cu）/ IO_4中也作为主要氧化剂〜-系统。

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  • 来源
    《Environmental Science & Technology》 |2014年第14期|8086-8093|共8页
  • 作者

    Hongshin Lee; Ha-Young Yoo; Jihyun Choi; In-Hyun Nam; Sanghyup Lee; Seunghak Lee; Jae-Hong Kim; Changha Lee; Jaesang Lee;

  • 作者单位

    Center for Water Resource Cycle, Korea Institute of Science and Technology, Seoul 136-791, Korea,Urban and Environmental Engineering, and KIST-UNIST-Ulsan Center for Convergent Materials (KUUC), Ulsan National Institute of Science and Technology, Ulsan 698-805, Korea;

    Center for Water Resource Cycle, Korea Institute of Science and Technology, Seoul 136-791, Korea,Energy Environmental Policy and Technology, Green School, Korea University-KIST, Seoul 136-701, Korea;

    Center for Water Resource Cycle, Korea Institute of Science and Technology, Seoul 136-791, Korea,Energy Environmental Policy and Technology, Green School, Korea University-KIST, Seoul 136-701, Korea;

    Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Korea;

    Center for Water Resource Cycle, Korea Institute of Science and Technology, Seoul 136-791, Korea,Energy Environmental Policy and Technology, Green School, Korea University-KIST, Seoul 136-701, Korea;

    Center for Water Resource Cycle, Korea Institute of Science and Technology, Seoul 136-791, Korea,Energy Environmental Policy and Technology, Green School, Korea University-KIST, Seoul 136-701, Korea;

    Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06511, United States;

    Urban and Environmental Engineering, and KIST-UNIST-Ulsan Center for Convergent Materials (KUUC), Ulsan National Institute of Science and Technology, Ulsan 698-805, Korea;

    Center for Water Resource Cycle, Korea Institute of Science and Technology, Seoul 136-791, Korea,Civi(I), Environmental, and Architectural Engineering, Korea University, Seoul 136-701, Korea;

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