Visible light induced degradation of perfluorooctanoic acid using iodine deficient bismuth oxyiodide photocatalyst,Journal of Hazardous Materials

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Visible light induced degradation of perfluorooctanoic acid using iodine deficient bismuth oxyiodide photocatalyst
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2023-06-19 , DOI: 10.1016/j.jhazmat.2023.131897
Jhimli Paul Guin ₁ , James A Sullivan ₂ , Jimmy Muldoon ₂ , K Ravindranathan Thampi ₃

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A bismuth oxyiodide photocatalyst having coexistent iodine deficient phases viz. Bi4O5I2 and Bi5O7I was prepared by using a solvothermal method followed by calcination process. This has been used for the degradation of model perfluoroalkyl acids such as perfluorooctanoic acid at low concentrations (1 ppm) under simulated solar light irradiation. 94% PFOA degradation with a rate constant of 1.7 h−1 and 65% defluorination of PFOA have been achieved following 2 h of photocatalysis. The degradation of PFOA happened by the parallel direct redox reactions with high energy photoexcited electrons at the conduction band, electrons in iodine vacancies and superoxide radicals. The degradation intermediates were analyzed by electrospray ionization-mass spectrometry in the negative mode. The catalyst was converted to a more iodine deficient Bi5O7I phase during photocatalysis following creation of iodine vacancies, some of which were compensated by the fluoride ions released from degraded PFOA.

中文翻译：

缺碘碘氧化铋光催化剂可见光诱导全氟辛酸降解

具有共存的缺碘相的碘氧化铋光催化剂。 Bi4O5I2和Bi5O7I是通过溶剂热法和煅烧过程制备的。这已用于在模拟太阳光照射下降解模型全氟烷基酸，例如低浓度（1 ppm）的全氟辛酸。光催化 2 小时后，PFOA 降解率达到 94%，速率常数为 1.7 h−1，PFOA 脱氟率达到 65%。 PFOA的降解是通过导带高能光生电子、碘空位中的电子和超氧自由基的平行直接氧化还原反应发生的。通过电喷雾电离-质谱法在负模式下分析降解中间体。在产生碘空位后，催化剂在光催化过程中转化为更缺碘的 Bi5O7I 相，其中一些空位由降解的 PFOA 释放的氟离子补偿。

更新日期：2023-06-19

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