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Novel enhanced defluorination of perfluorooctanoic acids by biochar-assisted ultrasound coupling ferrate: Performance and mechanism
Bioresource Technology ( IF 9.7 ) Pub Date : 2024-05-03 , DOI: 10.1016/j.biortech.2024.130790 Yongjia Lei 1 , Ruoqi Pu 2 , Yu Tian 3 , Ruixiang Wang 1 , Ravi Naidu 4 , Shihuai Deng 1 , Fei Shen 1
Bioresource Technology ( IF 9.7 ) Pub Date : 2024-05-03 , DOI: 10.1016/j.biortech.2024.130790 Yongjia Lei 1 , Ruoqi Pu 2 , Yu Tian 3 , Ruixiang Wang 1 , Ravi Naidu 4 , Shihuai Deng 1 , Fei Shen 1
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An ultrasound (US)/biochar (BC)/ferrate (Fe (VI)) system was firstly proposed to enhance perfluorooctanoic acid (PFOA) defluorination. It achieved 93 % defluorination optimally, higher than the sum of 77 % (28 % and 49 % for US/BC and US/Fe (VI) respectively), implying synergistic effect. Besides, the mechanism study confirmed that, this system can not only increase the specific surface area of BC and the generation of reactive oxidant species (ROS), enriching the active sites and forming new oxygen-containing functional groups, but also promote the formation of intermediate iron species. The PFOA degradation in the US/BC/Fe (VI) was probably an adsorption-degradation process, both ROS and electron transfer promoted the defluorination. Additionally, its sustainability was also demonstrated with 14 % reduced defluorination percentage after five cycles of BC. Overall, the synergistic effect of the US/BC/Fe (VI) and its enhancing mechanism for PFOA defluorination were clarified firstly, which contributes to the development of biochar for assisting polyfluoroalkyl substances degradation.
中文翻译：
生物炭辅助超声耦合高铁酸盐对全氟辛酸的新型强化脱氟：性能和机制
首次提出超声（US）/生物炭（BC）/高铁酸盐（Fe（VI））系统来增强全氟辛酸（PFOA）脱氟。其最佳脱氟率为 93%，高于 77% 的总和（US/BC 和 US/Fe (VI) 分别为 28% 和 49%），这意味着协同效应。此外，机理研究证实，该体系不仅可以增加BC的比表面积和活性氧化剂（ROS）的产生，丰富活性位点并形成新的含氧官能团，还可以促进BC的形成。中间铁种类。 US/BC/Fe(VI)中的PFOA降解可能是一个吸附-降解过程，ROS和电子转移都促进了脱氟。此外，其可持续性也得到了证明，五次 BC 循环后，脱氟百分比降低了 14%。总体而言，首次阐明了US/BC/Fe(VI)的协同效应及其对PFOA脱氟的增强机制，这有助于开发辅助多氟烷基物质降解的生物炭。
更新日期：2024-05-03
中文翻译：
生物炭辅助超声耦合高铁酸盐对全氟辛酸的新型强化脱氟：性能和机制
首次提出超声（US）/生物炭（BC）/高铁酸盐（Fe（VI））系统来增强全氟辛酸（PFOA）脱氟。其最佳脱氟率为 93%，高于 77% 的总和（US/BC 和 US/Fe (VI) 分别为 28% 和 49%），这意味着协同效应。此外，机理研究证实，该体系不仅可以增加BC的比表面积和活性氧化剂（ROS）的产生，丰富活性位点并形成新的含氧官能团，还可以促进BC的形成。中间铁种类。 US/BC/Fe(VI)中的PFOA降解可能是一个吸附-降解过程，ROS和电子转移都促进了脱氟。此外，其可持续性也得到了证明，五次 BC 循环后，脱氟百分比降低了 14%。总体而言，首次阐明了US/BC/Fe(VI)的协同效应及其对PFOA脱氟的增强机制，这有助于开发辅助多氟烷基物质降解的生物炭。
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