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首页> 外文期刊>Environmental Science & Technology >Singlet-Oxygen Generation in Alkaline Periodate Solution
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Singlet-Oxygen Generation in Alkaline Periodate Solution

机译：碱性高碘酸盐溶液中的单线态氧生成

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摘要

A nonphotochemical generation of singlet oxygen (~1O_2) using potassium periodate (KIO_4) in alkaline condition (pH ＞ 8) was investigated for selective oxidation of aqueous organic pollutants. The generation of ~1O_2 was initiated by the spontaneous reaction between IO_4~- and hydroxyl ions, along with a stoichiometric conversion of IO_4~- to iodate (IO_3~-). The reactivity of in-situ-generated ~1O_2 was monitored by using furfuryl alcohol (FFA) as a model substrate. The formation of ~1O_2 in the KIO_4/KOH system was experimentally confirmed using electron spin resonance (ESR) measurements in corroboration with quenching studies using azide as a selective ~1O_2 scavenger. The reaction in the KIO_4/KOH solution in both oxic and anoxic conditions initiated the generation of superoxide ion as a precursor of the singlet oxygen (confirmed by using superoxide scavengers), and the presence of molecular oxygen was not required as a precursor of ~1O_2. Although hydrogen peroxide had no direct influence on the FFA oxidation process, the presence of natural organic matter, such as humic and fulvic acids, enhanced the oxidation efficiency. Using the oxidation of simple organic diols as model compounds, the enhanced ~1O_2 formation is attributed to periodate-mediated oxidation of vicinal hydroxyl groups present in humic and fulvic constituent moieties. The efficient and simple generation of ~1O_2 using the KIO_4/KOH system without any light irradiation can be employed for the selective oxidation of aqueous organic compounds under neutral and near-alkaline conditions.
机译：研究了在碱性条件下（pH＞ 8）用高碘酸钾（KIO_4）产生的单光态氧（〜1O_2）的非光化学生成，以选择性氧化含水有机污染物。 〜10O_2的产生是由IO_4〜-和氢氧根离子之间的自发反应以及IO_4〜-到碘酸盐（IO_3〜-）的化学计量转化引起的。通过使用糠醇（FFA）作为模型底物，监测原位生成的〜1O_2的反应性。通过电子自旋共振（ESR）测量证实了KIO_4 / KOH系统中〜1O_2的形成，并通过叠氮化物作为选择性〜1O_2清除剂的淬灭研究进行了证实。在有氧和无氧条件下，在KIO_4 / KOH溶液中的反应均引发了超氧离子作为单线态氧的前体的生成（通过使用超氧化物清除剂确认），并且不需要分子氧作为〜1O_2的前体。尽管过氧化氢对FFA氧化过程没有直接影响，但天然有机物质（如腐殖酸和黄腐酸）的存在提高了氧化效率。使用简单的有机二醇的氧化作为模型化合物，〜1O_2形成的增加归因于高碘酸盐介导的腐殖质和富勒维酸构成部分中邻位羟基的氧化。使用KIO_4 / KOH系统在没有任何光照射的情况下高效，简单地生成〜1O_2可以用于在中性和近碱性条件下选择性氧化含水有机化合物。

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  • 来源
    《Environmental Science & Technology》 |2015年第24期|14392-14400|共9页
  • 作者

    Alok D. Bokare; Wonyong Choi;

  • 作者单位

    School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea;

    School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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