The role of the surfactant sodium dodecyl sulfate to dynamically reduce mass transfer resistance of SPEEK coated membrane for oil-in-water emulsion treatment
The role of the surfactant sodium dodecyl sulfate to dynamically reduce mass transfer resistance of SPEEK coated membrane for oil-in-water emulsion treatment
复制标题
表面活性剂十二烷基硫酸钠动态降低SPEK涂层膜水包油乳液传质阻力的作用
DOI：
10.1016/j.memsci.2017.06.079
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发表时间：
2017-11-01
影响因子：
9.5
通讯作者：
He, Tao
中科院分区：
文献类型：
--
作者：
Jin, Tonghui;Song, Jianfeng;He, Tao
含油乳状液采出水处理过程中的膜污染一直是油气行业面临的主要技术挑战。在这里，我们展示了用合成盐水包油乳液制备抗污染中空纤维膜及其性能。采用聚醚砜（PES）中空纤维包覆一层磺化聚醚酮（SPEEK）制备膜。SPEEK涂层膜的疏油性明显优于PES膜，这可能是由于SPEEK表面无孔，亲水性更高，且SPEEK表面带更多负电荷。SPEEK涂层膜可以实现完全的除油，没有任何明显的膜污染，并且比支持的PES膜具有更高的盐、浊度和十二烷基硫酸钠（SDS）的截留率。在SPEEK涂层膜上观察到水通量的初始增加。这里观察到的通量增加可归因于SDS分子加入SPEEK聚合物网络以及随后带电官能团之间的静电相互作用导致SPEEK层的构象变化。动态吸附和解吸实验证明了SDS和SPEEK之间的相互作用。在SPEEK聚合物网络中捕获的SDS的数量与水通量之间存在很强的相关性。这项研究的结果表明，SPEEK涂层膜在油气行业的采油和废水再利用方面具有重大突破的潜力。
Membrane fouling during the treatment of produced water containing oil emulsions remains a major technical challenge for the oil and gas industry. Here, we demonstrate the preparation and performance of a fouling resistant hollow fiber membrane using a synthetic saline oil-in-water emulsion. The membrane was prepared by coating commercial polyethersulfone (PES) hollow fibers with a layer of sulfonated polyether ether ketone (SPEEK). The SPEEK coated membrane was significantly more oleophobic than the support PES membrane, possibly due to a non-porous surface, higher hydrophilicity, and more negatively charged SPEEK surface. The SPEEK coated membrane could achieve complete oil rejection without any observable membrane fouling and considerably higher salt, turbidity, and sodium dodecyl sulfate (SDS) rejection than the support PES membrane. An initial increase in water flux was observed with the SPEEK coated membrane. The flux increase observed here could be attributed to the incorporation of SDS molecules into SPEEK polymeric network and subsequent electrostatic interaction amongst charged functional groups leading to conformational changes of the SPEEK layer. Dynamic adsorption and desorption experiments illustrated the interaction between SDS and SPEEK. A strong correlation between the amount of SDS entrapped in the SPEEK polymeric network and water flux was observed. Results from this study illustrated the potential of SPEEK coated membrane as a major breakthrough for oil recovery and wastewater reuse in the oil and gas industry.