Department of Environmental and Sustainable Engineering, University at Albany, SUNY, Albany, NY 12222, USA.
Department of Nanoengineering, SUNY Polytechnic Institute, Albany, NY 12203, USA.
J Environ Sci (China). 2020 Jul;93:48-56. doi: 10.1016/j.jes.2020.02.028. Epub 2020 Apr 4.
Nanophotocatalysts have shown great potential for degrading poly- and perfluorinated substances (PFAS). In light of the fact that most of these catalysts were studied in pure water, this study was designed to elucidate effects from common environmental factors on decomposing and defluorinating perfluorooctanoic acid (PFOA) by InO nanoparticles. Results from this work demonstrated that among the seven parameters, pH, sulfate, chloride, HO, InO dose, NOM and O, the first four had statistically significant negative effects on PFOA degradation. Since PFOA is a strong acid, the best condition leading to the highest PFOA removal was identified for two pH ranges. When pH was between 4 and 8, the optimal condition was: pH = 4.2; sulfate = 5.00 mg/L; chloride = 20.43 mg/L; HO = 0 mmol/L. Under this condition, PFOA decomposition and defluorination were 55.22 and 23.56%, respectively. When pH was between 2 and 6, the optimal condition was: pH = 2; sulfate = 5.00 mg/L; chloride = 27.31 mg/L; HO = 0 mmol/L. With this condition, the modeled PFOA decomposition was 97.59% with a defluorination of approximately 100%. These predicted results were all confirmed by experimental data. Thus, InO nanoparticles can be used for degrading PFOA in aqueous solutions. This approach works best when the target contaminated water contains low concentrations of NOM, sulfate and chloride and at a low pH.
纳米光催化剂在降解多氟和全氟化合物（PFAS）方面显示出巨大的潜力。鉴于大多数此类催化剂都是在纯水中进行研究的，因此本研究旨在阐明常见环境因素对 InO 纳米颗粒分解和脱氟全氟辛酸（PFOA）的影响。这项工作的结果表明，在这七个参数中，pH 值、硫酸盐、氯化物、HO、InO 剂量、NOM 和 O，前四个对 PFOA 降解有统计学上显著的负面影响。由于 PFOA 是一种强酸，因此确定了两个 pH 范围内导致 PFOA 去除率最高的最佳条件。当 pH 值在 4 到 8 之间时，最佳条件为：pH = 4.2；硫酸盐= 5.00 mg/L；氯化物= 20.43 mg/L；HO = 0 mmol/L。在此条件下，PFOA 的分解和脱氟率分别为 55.22%和 23.56%。当 pH 值在 2 到 6 之间时，最佳条件为：pH = 2；硫酸盐= 5.00 mg/L；氯化物= 27.31 mg/L；HO = 0 mmol/L。在此条件下，PFOA 的分解模拟率为 97.59%，脱氟率约为 100%。这些预测结果均得到实验数据的验证。因此，InO 纳米颗粒可用于降解水溶液中的 PFOA。当目标污染水中含有低浓度的 NOM、硫酸盐和氯化物且 pH 值较低时，该方法效果最佳。
