Highly efficient simultaneous catalytic degradation and defluorination of perfluorooctanoic acid by the H2O2-carbon/MnO2 system generating O2•- and •OH synchronously
Highly efficient simultaneous catalytic degradation and defluorination of perfluorooctanoic acid by the H2O2-carbon/MnO2 system generating O2•- and •OH synchronously
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DOI：
10.1016/j.apcatb.2020.119219
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发表时间：
2020-11-15
影响因子：
22.1
通讯作者：
Ma, Jun
中科院分区：
文献类型：
--
作者：
He, Xu;Sun, Bo;Ma, Jun
首次制备了石墨烯/MnO 2和碳纳米管/MnO 2复合材料，用于处理全氟辛酸（PFOA）。由于碳/MnO 2颗粒以H2 O2为燃料的快速自分散性、碳材料提供的大的固体表面积以及中心点OH和O-2（中心点-）的有效同时产生，在15 min内实现了高的PFOA降解率和去磷效率。有趣的是，不同的（OH）-O-中心点清除剂对PFOA的降解效果相反。硝基苯对PFOA降解的抑制作用是通过清除（OH）-O-中心点抑制O-2（中心点）-的产生而实现的。而高浓度异丙醇和叔丁醇的加入提高了PFOA的降解效率，这是由于异丙醇和叔丁醇的极性比水小，导致O-2（中心点-）的反应活性更高。该研究为PFOA的有效治疗提供了新的选择。
Carbon/MnO2 composites including graphene/MnO2 and CNT/MnO2 were synthesized to treat perfluorooctanoic acid (PFOA) for the first time. Owing to the fast self-dispersion of carbon/MnO2 particles with H2O2 as the fuel, large solid surface area provided by carbon materials, and the effective simultaneous generation of center dot OH and O-2(center dot-), high PFOA degradation and defluorination efficiencies were achieved synchronously within 15 min. Interestingly, different (OH)-O-center dot scavengers showed opposite effects on PFOA degradation. The inhibition of PFOA degradation by nitrobenzene was due to the scavenging of (OH)-O-center dot resulting in the restraint of O-2(center dot)- generation. While the increasing PFOA degradation efficiency with the addition of high concentration of isopropanol and tert-butyl alcohol was due to the less polarity of them than water resulting in the higher reactivity of O-2(center dot-). Conclusively, the study provided a new alternative for the effective treatment of PFOA.