Hexafluoropropylene oxide dimer acid (GenX) has been marketed as a substitute for perfluorooctanoic acid (PFOA) to reduce environmental and health risks. GenX and PFOA have been detected in various natural water sources, and adsorption is recognized as a typical treatment process for PFOA removal. In this paper, comparisons of GenX and PFOA adsorption are evaluated, including adsorption potential, adsorption mechanisms, and associated costs. A detailed literature review suggests that anion-exchange resins are more effective in removing GenX than activated carbon. GenX removal efficiency through activated carbon (30%) is lower than that of PFOA (80–95%), while GenX and PFOA removal efficiencies by anion exchange resins are similar (99%). Unconventional adsorbents, such as ionic fluorogels and covalent organic frameworks can effectively remove GenX from water. The review reveals that GenX adsorption is more challenging, requiring almost 4 times the treatment cost of its predecessor, PFOA. Annual operation and maintenance costs for GenX adsorption (initial concentration of GenX and PFOA = 0.2 µg.L⁻¹) by GAC for treating 10,000 m³ per day is almost US$1,000,000 per year, but only around US$240,000 per year for PFOA. Desorption of GenX in the presence of PFOA highlights GenX's inferior treatability by adsorption. It is believed that GenX is a more environmentally friendly compound than PFOA, but this environmental friendliness comes with the price.

六氟环氧丙烷二聚酸 (GenX) 已作为全氟辛酸 (PFOA) 的替代品上市销售，以降低环境和健康风险。GenX 和 PFOA 已在各种天然水源中检测到，吸附被认为是去除 PFOA 的典型处理工艺。在本文中，评估了 GenX 和 PFOA 吸附的比较，包括吸附潜力、吸附机制和相关成本。详细的文献综述表明，阴离子交换树脂在去除 GenX 方面比活性炭更有效。GenX 通过活性炭的去除效率 (30%) 低于 PFOA (80-95%)，而 GenX 和 PFOA 通过阴离子交换树脂的去除效率相似 (99%)。非常规吸附剂 例如离子荧光凝胶和共价有机框架可以有效地从水中去除 GenX。审查表明，GenX 吸附更具挑战性，其处理成本几乎是其前身 PFOA 的 4 倍。GenX 吸附的年度运行和维护成本（GenX 和 PFOA 的初始浓度 = 0.2 µg。L ^-1 ) 由 GAC每天处理 10,000 m ^{3 的}费用几乎为每年 1,000,000 美元，但对于全氟辛酸，每年仅为约 240,000 美元。在全氟辛酸存在下 GenX 的解吸凸显了 GenX 的吸附处理能力较差。人们相信 GenX 是一种比 PFOA 更环保的化合物，但这种环保是有代价的。