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Cocatalyst or substrate? Competitive Fenton transformation of Cysteine and Salicylic acid

Abstract

Sulfhydryl compounds and quinone/hydroquinone analogues have been found to effectively accelerate the Fenton reaction by accelerating the Fe3+/Fe2+ redox cycle. However, the direct comparison of sulfhydryl compounds with quinone/hydroquinone analogues has been less reported. In this work, salicylic acid (SA) and cysteine (Cys) were put together in a “coexistence system”, we found that Cys showed better catalytic performance than salicylic acid SA, with different pH and atmosphere. Electrospray ionization mass spectrometry (ESI-MS) showed that in the coexistence system, Cys was not easily destroyed by hydroxyl radical, and the transformation of SA was greatly accelerated. This further indicated the superior cocatalytic performance of Cys compared with quinone/hydroquinone analogues. Furthermore, the competitive transformation mechanism of Cys and SA in the coexistence system are proposed.

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Publication details

The article was received on 22 Feb 2019, accepted on 15 Apr 2019 and first published on 16 Apr 2019


Article type: Paper
DOI: 10.1039/C9EW00158A
Citation: Environ. Sci.: Water Res. Technol., 2019, Accepted Manuscript

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    Cocatalyst or substrate? Competitive Fenton transformation of Cysteine and Salicylic acid

    D. Tang, G. Zhang, F. Chen and J. Ma, Environ. Sci.: Water Res. Technol., 2019, Accepted Manuscript , DOI: 10.1039/C9EW00158A

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