Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chou-Shan Rd., Taipei, 10673, Taiwan.
School of Public Health, Taipei Medical University, 250 Wu-Xing Street, Taipei, 11031, Taiwan.
Chemosphere. 2021 Mar;266:128949. doi: 10.1016/j.chemosphere.2020.128949. Epub 2020 Nov 13.
Perfluorooctanoic acid (PFOA) was separated and recovered using a foam flotation process aided by cationic surfactants. The PFOA removal efficiency was in the following decreasing order: OTAB (CTAB) > DTAB (CTAB) > CTAB (CTAB) > TBAB, which indicates that cationic surfactants with an alkyl chain that had a similar length to that of PFOA had higher affinities to PFOA. PFOA removal slightly decreased with increasing ionic strength of the surfactant but did not change with the pH. PFOA could be completely removed in 20 min with 1.25 mM of OTAB in actual wastewater. The energy yield value of foam flotation with a cationic surfactant was much higher than those of other methods, which means that using foam flotation with a cationic surfactant as the collector is a simple, fast, and energy-efficient method to separate and recover PFOA from dilute water solutions.
全氟辛酸（PFOA）可通过泡沫浮选工艺辅以阳离子表面活性剂分离和回收。PFOA 的去除效率按以下顺序降低：OTAB（CTAB）> DTAB（CTAB）> CTAB（CTAB）> TBAB，这表明与 PFOA 具有相似烷基链长度的阳离子表面活性剂对 PFOA 具有更高的亲和力。随着表面活性剂离子强度的增加，PFOA 的去除率略有下降，但 pH 值没有变化。在实际废水中，使用 1.25mM 的 OTAB 可在 20 分钟内完全去除 PFOA。用阳离子表面活性剂进行泡沫浮选的能量产率值远高于其他方法，这意味着使用阳离子表面活性剂作为捕收剂进行泡沫浮选是一种从稀水溶液中分离和回收 PFOA 的简单、快速和节能的方法。
