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碱处理后管状陶瓷膜选择性性能的改性

Modification of the Selectivity Properties of Tubular Ceramic Membranes after Alkaline Treatment.

作者信息

Dutournié Patrick, Limousy Lionel, Anquetil Jérôme, Déon Sébastien

机构信息

IS2M (UMR CNRS 7228), Université de Haute Alsace, 3 bis rue A. Werner, 68093 Mulhouse CEDEX, France.

TAMI-Industries, Z.A. Les Laurons CS65, 26111 Nyons CEDEX, France.

出版信息

Membranes (Basel). 2017 Nov 21;7(4):65. doi: 10.3390/membranes7040065.

DOI:10.3390/membranes7040065
PMID:29160802
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5746824/
Abstract

This work focuses on the selectivity modification of ceramic membranes after a mild alkaline treatment. Filtration of pure salt-water solutions was carried out with commercial titania membranes before and after the treatment. After treatment, the rejection of NaF significantly decreased, while the rejection of NaCl and NaBr increased. Additionally, NaI and Na₂SO₄ remained close to zero. Pore size and electrical charge being almost unchanged, only significant modifications in the dielectric effects can explain this modification of selectivity. Therefore, the surface chemistry and the interaction (nature and magnitude) with the solvent and with the species present in the solution appear to be modified by the alkaline treatment. This trend is also illustrated by discussing the electric and the dielectric properties that were numerically identified before and after treatment. The alkaline treatment significantly decreased the apparent dielectric constant of NaCl-water solution in the pore, highlighting the rejection of sodium chloride. Contrariwise, the modification of the surface chemistry increased the apparent dielectric constant of NaF-water solution by promoting fluoride transmission.

摘要

这项工作聚焦于轻度碱处理后陶瓷膜的选择性改性。使用商业二氧化钛膜在处理前后对纯盐水溶液进行过滤。处理后，NaF的截留率显著降低，而NaCl和NaBr的截留率增加。此外，NaI和Na₂SO₄的截留率几乎保持为零。孔径和电荷几乎未变，只有介电效应的显著变化能够解释这种选择性的改变。因此，表面化学以及与溶剂和溶液中存在的物质的相互作用（性质和强度）似乎因碱处理而发生了改变。通过讨论处理前后数值确定的电学和介电性质，这一趋势也得到了说明。碱处理显著降低了孔隙中NaCl水溶液的表观介电常数，突出了氯化钠的截留。相反，表面化学的改变通过促进氟化物传输增加了NaF水溶液的表观介电常数。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b81/5746824/7e400f2eaefd/membranes-07-00065-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b81/5746824/3152a0fe89bc/membranes-07-00065-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b81/5746824/57c89ebb90ee/membranes-07-00065-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b81/5746824/83bc2762fe8d/membranes-07-00065-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b81/5746824/9e46b5a0212a/membranes-07-00065-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b81/5746824/099da54f1b83/membranes-07-00065-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b81/5746824/53b75c9619d4/membranes-07-00065-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b81/5746824/cc38a2119914/membranes-07-00065-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b81/5746824/c8fb16526e5e/membranes-07-00065-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b81/5746824/7e400f2eaefd/membranes-07-00065-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b81/5746824/3152a0fe89bc/membranes-07-00065-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b81/5746824/57c89ebb90ee/membranes-07-00065-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b81/5746824/83bc2762fe8d/membranes-07-00065-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b81/5746824/9e46b5a0212a/membranes-07-00065-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b81/5746824/099da54f1b83/membranes-07-00065-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b81/5746824/53b75c9619d4/membranes-07-00065-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b81/5746824/cc38a2119914/membranes-07-00065-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b81/5746824/c8fb16526e5e/membranes-07-00065-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5b81/5746824/7e400f2eaefd/membranes-07-00065-g009.jpg

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