National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China.
Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611, United States.
J Hazard Mater. 2021 Aug 15;416:125866. doi: 10.1016/j.jhazmat.2021.125866. Epub 2021 Apr 12.
Perfluorooctanoic acid (PFOA) is widely concerned because its serious toxicity to the environment and ecosystems. In order to effectively and conveniently remove PFOA from aqueous solutions, reduced graphene oxide aerogel modified by Cu nanoparticles and fluorine (Cu/F-rGA) was prepared by the microbubble template method as an electrode in electrosorption. The removal capacity of Cu/F-rGA electrode to PFOA was 489% and 45.9% higher at + 0.8 V than that of open circuit and unmodified electrode, respectively. These significant improvements can be attributed to the advantages of Cu/F-rGA in ligand exchange reaction and electrostatic attraction under voltage assistance. The regeneration of Cu/F-rGA electrode maintained 75.51% capacity after 10 times electrosorption-desorption by applying reverse voltage. These properties provided potential for the reuse and application of Cu/F-rGA electrode. The electrosorption isotherm and model results showed that PFOA tended to be parallel to the adsorption site at low temperature and perpendicular at high temperature. The number of PFOA molecules connected to each adsorption site was 0.72-1.76, and the number of adsorption layers of PFOA on the electrode was between 1.46 and 2.87. Findings from this study provide a green and effective strategy to remove PFOA from aqueous solutions with low energy consumption.
全氟辛酸（PFOA）因其对环境和生态系统的严重毒性而受到广泛关注。为了有效、便捷地从水溶液中去除 PFOA，采用微泡模板法制备了由纳米铜和氟改性的还原氧化石墨烯气凝胶（Cu/F-rGA）作为电吸附中的电极。与开路和未改性电极相比，Cu/F-rGA 电极在 +0.8 V 下对 PFOA 的去除容量分别提高了 489%和 45.9%。这些显著的改进可以归因于 Cu/F-rGA 在电压辅助下配体交换反应和静电吸引方面的优势。通过施加反向电压，Cu/F-rGA 电极在 10 次电吸附-解吸后保持了 75.51%的容量，具有良好的再生性能。这些特性为 Cu/F-rGA 电极的重复使用和应用提供了潜力。电吸附等温线和模型结果表明，在低温下，PFOA 倾向于平行于吸附位，而在高温下则垂直于吸附位。每个吸附位连接的 PFOA 分子数为 0.72-1.76，PFOA 在电极上的吸附层数为 1.46-2.87。本研究的结果为用低能耗的方法从水溶液中去除 PFOA 提供了一种绿色、有效的策略。
