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首页> 外文期刊>Separation and Purification Technology >Chemical alteration of LDPE hollow fibers exposed to monoethanolamine solutions used as absorbent for CO2 capture process
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Chemical alteration of LDPE hollow fibers exposed to monoethanolamine solutions used as absorbent for CO2 capture process

机译：暴露于单乙醇胺溶液中的LDPE中空纤维的化学变化，用作吸收CO2的过程

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摘要

The effect of monoethanolamine (MEA) on the surface of non-porous low density polyethylene (LDPE) hollow fibers aimed to be used in membrane contactors was investigated. LDPE hollow fibers were kept in contact with MEA solution (fresh (unloaded) or after CO2 loading) for lengths of time varying from 8 to 45 days, at different temperatures and solution pH. FT-1R, XPS and contact angle analyses were performed in order to monitor chemical changes on the membrane surface. After keeping the fibers in contact with unloaded MEA solutions for prolonged time (more than 8 days) and thoroughly washing the samples with water, XPS analysis showed an increase in oxygen and nitrogen content of hollow fibers. In addition, FT-IR spectra showed the presence of carbonyl and amide groups on the LDPE hollow fiber surface. These groups were found to be in more significant quantity at higher temperatures. It is suggested that the LDPE hollow fibers undergo oxidative degradation. The reaction between MEA and carbonyl groups generated by oxidation on the LDPE surface might lead to the formation of amide groups. On the other hand, contact angle measurements showed that the hydro-phobicity of hollow fibers decreased as the result of the increase in their surface energy, which can reduce the long-term stability of membranes in membrane contactors. However, based on both FT-IR and contact angle measurements, LDPE chemical degradation was found to be less important in the presence of CO2 due to the reduction of the pH of loaded MEA solutions, leading to a much slower alteration of the membrane hydrophobic properties.
机译：研究了单乙醇胺（MEA）对旨在用于膜接触器的无孔低密度聚乙烯（LDPE）中空纤维表面的影响。 LDPE中空纤维在不同温度和溶液pH下，与MEA溶液接触（新鲜（未装载）或在装载CO2之后）持续8至45天不等。进行FT-1R，XPS和接触角分析，以监测膜表面的化学变化。使纤维与未加载的MEA溶液长时间接触（超过8天）并用水彻底洗涤样品后，XPS分析显示中空纤维的氧和氮含量增加。另外，FT-IR光谱显示在LDPE中空纤维表面上存在羰基和酰胺基。发现这些组在较高温度下的数量更多。提示LDPE中空纤维会发生氧化降解。 MEA与LDPE表面氧化产生的羰基之间的反应可能导致酰胺基的形成。另一方面，接触角测量表明中空纤维的疏水性由于其表面能的增加而降低，这会降低膜在膜接触器中的长期稳定性。但是，基于FT-IR和接触角测量，发现由于CO2的存在，由于加载的MEA溶液的pH值降低，LDPE化学降解的重要性降低，从而导致膜疏水性的变化慢得多。

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