This paper investigated the photodegradation characteristics of benzoquinones and benzoquinoneimines. The photosensitivity of benzoquinones and benzoquinoneimines were analyzed by measuring the yield of SO 4 −· in a light/Fe2+/S2O8 2− system and the degradation mechanism of benzoquinones, then discussed benzoquinoneimines in light/Fe2+/S2O8 2− and light/S2O8 2− system. The results revealed that a more aggressive oxidation of benzoquinones and benzoquinoneimines by the sunlight/Fe2+/S2O8 2− method showed a more rapid and more complete removal of chromaticity than that of the UV/Fe2+/S2O8 2− method. It was showed that they were photosensitizers, and they could generate 1O2 and O 2 −· which could promote the formation of SO 4 −· and ·OH in the sunlight system. Nevertheless, for benzoquinones, the sunlight/S2O8 2− method was superior to the UV/S2O8 2− method. For benzoquinoneimines, the sunlight/S2O8 2− method was inferior to the UV/S2O8 2− method. In addition, the yield of SO 4 −· in the sunlight/Fe2+/S2O8 2− system was more than that of the UV/Fe2+/S2O8 2− system. Therefore, the photosensitivity of benzoquinones is superior to benzoquinoneimines in water treatment.
Research on Chemical Intermediates – Springer Journals
Published: Oct 11, 2016
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