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首页> 外文期刊>Desalination: The International Journal on the Science and Technology of Desalting and Water Purification >Positively charged thin-film composite hollow fiber nanofiltration membrane for the removal of cationic dyes through submerged filtration
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Positively charged thin-film composite hollow fiber nanofiltration membrane for the removal of cationic dyes through submerged filtration

机译：带正电荷的薄膜复合中空纤维纳滤膜，用于通过浸没过滤去除阳离子染料

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Positively charged thin-film composite hollow fiber nanofiltration membranes were developed by the dip-coating method using polypropylene hollow fiber microfiltration membrane as support, polyvinyl alcohol (PVA) and polyquaternium-10 (the reaction product of hydroxyethyl cellulose with a trimethylammonium substituted epoxide, PQ-10) as coating materials, and glutaraldehyde as cross-linking agent. Attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy, field emission scanning electron microscopy (FESEM), measurements of streaming potential and contact angle were employed to characterize the obtained membranes. The permeation properties were estimated through pressurized cross-flow permeation tests and the dye removal performance were evaluated through submerged filtration tests using cationic dye aqueous solutions. It was found that the salt rejection order of the membrane was CaCl2 > MgCI2 > NaCl > MgSO4 > Na2SO4 at neutral pH. The desired membrane with a molecular weight cut-off of about 650 Da had a pure water flux of 25.7 1/m~2 h and a rejection of 92.8% to 500 mg/1 CaCl2 aqueous solution at 3.0 bar. The membrane could effectively remove cationic dyes from aqueous solution with good long-term performance stability through submerged filtration. The observed rejections to Brilliant green, Victoria blue B and Crystal violet were 99.8,99.8 and 99.2%, respectively, under the trans-membrane pressure of 0.7 bar.
机译：通过浸涂法，以聚丙烯中空纤维微滤膜为载体，聚乙烯醇（PVA）和聚季铵盐10（羟乙基纤维素与三甲基铵取代的环氧化物PQ的反应产物），开发了带正电荷的薄膜复合中空纤维纳滤膜。 -10）作为涂料，戊二醛作为交联剂。使用衰减全反射傅里叶变换红外（ATR-FTIR）光谱，场发射扫描电子显微镜（FESEM），测量流电势和接触角来表征获得的膜。通过加压错流渗透测试评估渗透性能，并使用阳离子染料水溶液通过浸没过滤测试评估染料去除性能。发现在中性pH下膜的脱盐顺序为CaCl 2＞ MgCl 2＞ NaCl＞ MgSO 4＞ Na 2 SO 4。分子量截断值约为650 Da的所需膜的纯水通量为25.7 1 / m〜2 h，并且在3.0 bar下对500 mg / 1 CaCl2水溶液的截留率为92.8％。该膜可通过浸没过滤有效地从水溶液中去除阳离子染料，并具有良好的长期性能稳定性。在0.7 bar的跨膜压力下，观察到的对亮绿色，维多利亚蓝B和结晶紫的排斥率分别为99.8％，99.8％和99.2％。

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