Wetting mechanism of a PVDF hollow fiber membrane in immersed membrane contactors for CO2 capture in the presence of monoethanolamine
Wetting mechanism of a PVDF hollow fiber membrane in immersed membrane contactors for CO2 capture in the presence of monoethanolamine
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单乙醇胺存在下用于 CO2 捕获的浸入式膜接触器中 PVDF 中空纤维膜的润湿机制
DOI：
10.1039/c6ra28563e
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发表时间：
2017-02
期刊：
影响因子：
3.9
通讯作者：
Hongwei Zhang
中科院分区：
文献类型：
--
作者：
Zhaohui Zhang;Xiaona Wu;Liang Wang;Bin Zhao;Junjing Li;Hongwei Zhang
作为一种新兴的技术，膜气体吸收（MGA）接触器用于二氧化碳（CO2）捕获与传统的化学CO2吸收过程相比，具有很大的优势。然而，由膜的润湿引起的膜通量的下降是严重的技术问题。在这项研究中，以更好地了解的润湿机制的聚偏氟乙烯（PVDF）中空纤维膜在浸没式膜接触器中的CO2捕获，进行了30天的操作CO2吸收，其中，2 M的单乙醇胺（MEA）溶液和去离子水被用作吸收剂。结果表明，MEA的存在加剧了膜的润湿现象，从而显著降低了膜通量和膜的疏水性。X射线光电子能谱（XPS）和衰减全反射-红外光谱（ATR-IR）分析的润湿膜证明，没有发生化学反应的MEA和膜之间。此外，没有润湿膜的疏水组分溶解在MEA溶液中。相反，在被MEA吸收剂润湿的膜的交联网络中观察到MEA的存在。场发射扫描电子显微镜（FE-SEM）图像的湿膜的外表面表明，膜的形态发生变化，膜壁增厚，特别是对于膜润湿的MEA吸收剂。膜溶胀的两个重要特征是膜中MEA分子的存在和膜壁的增厚。润湿膜的机械强度的变化也证明了膜溶胀的发生。基于上述结果，可以得出结论，膜溶胀引起的膜润湿在浸没式PVDF膜接触器用于CO2捕获，和MEA的吸收剂中的存在进一步加剧了膜溶胀的过程。
As an emerging technology, membrane gas absorption (MGA) contactors for carbon dioxide (CO2) capture exhibit great advantages compared to conventional chemical CO2 absorption processes. However, the decline in membrane flux, caused by the membrane's wetting, is a serious technical problem. In this study, to better understand the wetting mechanism of a polyvinylidene fluoride (PVDF) hollow fiber membrane in an immersed membrane contactor for CO2 capture, a 30 day operation of CO2 absorption was conducted, in which, 2 M monoethanolamine (MEA) solution and deionized water were used as the absorbents. The results showed that the presence of MEA in the absorbent solution aggravated the wetting phenomenon, thus significantly decreasing the membrane flux and membrane hydrophobicity. X-ray photoelectron spectroscopy (XPS) and attenuated total reflection-infrared spectroscopy (ATR-IR) analyses for the wetted membranes proved that no chemical reactions occurred between the MEA and the membrane. Furthermore, no hydrophobic components of the wetted membrane dissolved in the MEA solution. Instead, the presence of MEA was observed in the cross-linked network of the membrane wetted by the MEA absorbent. Field emission scanning electron microscope (FE-SEM) images of the outer surfaces of the wetted membranes suggested that the membrane morphologies changed and the membrane walls thickened, especially for the membrane wetted by the MEA absorbent. Both the presence of MEA molecules in the cross-linked network of the wetted membrane and the thickening of the membrane wall were important characteristics of membrane swelling. The changes in mechanical strengths of the wetted membranes also testified that membrane swelling occurred. Based on the above results, it was concluded that the membrane swelling caused the membrane wetting in the immersed PVDF membrane contactor for CO2 capture, and the presence of MEA in the absorbent further aggravated the process of membrane swelling.
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