Strongly prolonged hydroxyl radical production for Fenton-like reactions: The golden touch of Cu

[Display omitted] •Addition of Cu(II) could strongly prolong the Fenton-like generation of hydroxyl radicals.•The Fe/Cu/CDBQ/H2O2 system efficiently mineralized organic pollutants while control reactions do not.•The Fe/Cu/CDBQ/H2O2 system performs well at pH 5.20. Hydroxyl radicals are believed as t...

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Bibliographic Details
Published in:Separation and purification technology 2019-04, Vol.213, p.500-506
Main Authors: Da, Xuwen, Ji, Hongwei, Zhao, Zhenwen, Lan, Rongshan, Li, Tuo, Ma, Jiahai
Format: Article
Language:English
Subjects:
Copper ion
Fenton reaction
Hydroxyl radical
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Summary:[Display omitted] •Addition of Cu(II) could strongly prolong the Fenton-like generation of hydroxyl radicals.•The Fe/Cu/CDBQ/H2O2 system efficiently mineralized organic pollutants while control reactions do not.•The Fe/Cu/CDBQ/H2O2 system performs well at pH 5.20. Hydroxyl radicals are believed as the most reactive species in the Fenton-like reactions and perform well at the beginning stage of the reaction due to very short lifetime. A reaction system with strongly prolonged hydroxyl radical lifetime is rarely reported. Adding Cu ions, an unreactive catalyst for hydrogen peroxide activation, the Fe/Cu/CDBQ/H2O2 system efficiently prolonged hydroxyl radical lifetime with two orders. This study found a strong, prolonged hydroxyl radical generation in a Fenton-like system using iron, copper ions and 2,5-dihydroxy-1,4-benzoquinone restricted in cyclodextrin (CDBQ). Meanwhile, rapid degradation and substantial mineralization of organics was achieved in this system. Further, the Cu ions could promote the efficiency of other Fenton-like system.
ISSN:1383-5866
1873-3794
DOI:10.1016/j.seppur.2018.12.060