Performance of ceramic nanofiltration membrane for desalination of dye solutions containing NaCl and Na2SO4
Performance of ceramic nanofiltration membrane for desalination of dye solutions containing NaCl and Na2SO4
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DOI：
10.1016/j.desal.2016.11.014
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发表时间：
2017-02-17
期刊：
影响因子：
9.9
通讯作者：
Fan, Yiqun
中科院分区：
文献类型：
--
作者：
Chen, Pengli;Ma, Xiao;Fan, Yiqun
使用膜技术去除染料溶液中的混合盐仍需要改进以实现高染料截留率和低盐截留率。在这项工作中，陶瓷膜的孔径为1.5 nm，提出了一个令人满意的脱盐染料溶液中含有NaCl和Na 2SO 4相比，两个商业有机纳滤膜元件（DK和DL）。研究了盐含量、盐种类、NaCl/Na 2SO 4摩尔比、染料浓度和pH值对陶瓷膜对铬黑T（EBT）脱盐性能的影响。结果表明，染料截留率随盐含量、染料浓度和溶液pH值的增加而降低。与染料NaCl溶液相比，染料Na 2SO 4溶液具有较高的通量和较低的染料截留率。对于混合盐染料溶液，由于滤饼层结构的变化，随着C-NaCl/C-Na_2SO_4的减小，膜通量先增大后减小，高于单一盐染料溶液。在酸性条件下，EBT的高截留率（>99%）主要是由氢键形成的超分子聚集体所致。对NaCl和Na_2SO_4的截留率分别小于20%和40%。这些结果表明，这种新型陶瓷膜在染料纯化方面具有潜在的应用前景。(C)2016爱思唯尔B. V.保留所有权利。
Removing mixture salts from dye solutions using membrane technology still need to be improved for high dye rejection and low salt rejection. In this work, ceramic membrane with pore size of 1.5 nm presented a satisfactory desalination of dye solutions containing NaCl and Na2SO4 compared with two commercial organic nanofiltration membrane elements (DK and DL). Effect of salt content, salt type, molar ratio of NaCl and Na2SO4, dye concentration and pH on performance of ceramic membrane for desalination of Eriochrome black T (EBT) were investigated. The results showed that dye rejection decreased by increasing salt content, dye concentration and solution pH. Compared with dye-NaCI solutions, a relative high flux and low rejection of dye were observed when treating dye-Na2SO4 solutions. For the mixture salt-dye solutions, the flux, which was higher than that for the single salt dye solutions, first increased then decreased with decreasing C-NaCl/C-Na2so4 due to the change of structure of cake layer. Supper-molecule aggregates of EBT formed by hydrogen-bond is mainly responsible for the high rejection of EBT (>99%) at acid conditions. The rejection of NaCl and Na2SO4 was below 20% and 40%, respectively. These promising results demonstrates that the new ceramic membrane has a potential application in dye purification. (C) 2016 Elsevier B.V. All rights reserved.