Perfluorooctane sulfonate removal by nanofiltration membrane the role of calcium ions
Perfluorooctane sulfonate removal by nanofiltration membrane the role of calcium ions
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全氟辛烷磺酸纳滤膜去除钙离子的作用
DOI：
10.1016/j.cej.2013.08.027
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发表时间：
2013-11
影响因子：
15.1
通讯作者：
Zhaokun Luan
中科院分区：
文献类型：
--
作者：
Guangzhi He;Tao Wang;Deyin Hou;Zhaokun Luan
全氟辛烷磺酸(PFOS)是水环境中的一种持久性和突发性污染物，是全球关注的问题。因此，将其从地表水中去除对饮用水安全至关重要。在本研究中，使用NF270膜去除模拟含钙地表水中的全氟辛烷磺酸。考察了全氟辛烷磺酸浓度、钙浓度和pH值对全氟辛烷磺酸截留率的影响。此外，还通过扫描电子显微镜、原子力显微镜、接触角和全氟辛烷磺酸的累积对膜的渗透通量性能和膜的形态进行了评价。结果表明，当料液中存在0.1 mM和1 mM的钙离子时，全氟辛烷磺酸的截留率随着全氟辛烷磺酸浓度的增加而增加。对于100ppb的全氟辛烷磺酸，随着氯化钙浓度的增加，全氟辛烷磺酸的截留率从94.0%提高到99.3%，在0.4 Mpa的压力下，钙浓度从0增加到2 mm，这是由于较小阴离子的渗透性增加，以及钙桥和孔堵塞。此外，密度泛函理论(DFT)的计算还可以量化钙桥联机理，并定性地解释全氟辛烷磺酸截留效率的提高。PH值对全氟辛烷磺酸的截留率有显著影响，当pH从3增加到9时，在0.4 mM和0.1 mM的钙离子存在下，全氟辛烷磺酸的截留率分别从86%和93%增加到95%和97%。渗透通量表明，与单一的全氟辛烷磺酸体系相比，钙的加入降低了渗透通量。扫描电子显微镜和原子力显微镜的图像显示，随着钙离子浓度的增加，膜表面沉淀增多，表面粗糙度增加，膜上全氟辛烷磺酸的积累量增加，这与膜通量的下降相对应。
Perfluorooctane sulfonate (PFOS) is a persistent and emergent contaminant in aqueous environments that is a problem of global concern. Accordingly, its removal from surface water is critical to drinking water security. In this study, the NF270 membrane was used to remove PFOS from simulated surface water containing calcium ions. The effects of PFOS concentration, calcium concentration and pH on PFOS rejection were investigated. Additionally, permeate flux performance and membrane morphology were also evaluated based on SEM, AFM, contact angle and PFOS accumulation. The results showed that PFOS rejection increased with PFOS concentration in the range of 10–500 ppb when 0.1 mM Ca2+and 1 mM Ca2+were present in the feed solution. An increase of calcium chloride concentration enhanced PFOS rejection from 94.0% to 99.3% for the feed of 100 ppb PFOS with calcium concentration from 0 to 2 mM at 0.4 MPa owing to the increasing permeation of the smaller anions, as well as calcium-bridging and pore blockage. Density functional theory (DFT) calculations furthermore allowed quantifying the calcium-bridging mechanism and qualitatively interpreting the improvement of the PFOS rejection efficiency. pH had a significant effect on PFOS rejection, with an increase in pH from 3 to 9 leading to an increase in PFOS rejection from 86% to 95% and 93% to 97% in the presence of 0.1 mM Ca2+and 1 mM Ca2+at 0.4 MPa, respectively. The permeate flux demonstrated that the addition of calcium decreased the permeate flux compared to the single PFOS system. With the calcium concentration increase, the images of SEM and AFM exhibited that the membrane surface had more precipitation and higher surface roughness, and PFOS accumulation on the membrane increased, all off which correspond to flux decline.
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影响因子：
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