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Advanced desalination of dye/NaCl mixures by a loose nanofiltration membrane for digital ink-jet printing

Version 2 2024-06-05, 05:40
Version 1 2019-08-28, 08:19
journal contribution
posted on 2024-06-05, 05:40 authored by W Ye, J Lin, R Borrego, D Chen, A Sotto, P Luis, M Liu, Shuaifei ZhaoShuaifei Zhao, CY Tang, B Van der Bruggen
In digital printing, a high salt content in dye solutions is detrimental, which calls for effective strategy for dye/salt fractionation. In this study, a loose nanofiltration (NF) membrane Sepro 2A was employed to desalinate diverse dye species (2 reactive dyes and 4 cationic dyes). This membrane, with a molecular weight cutoff of 490 Da, showed consistently high rejections to all the reactive and cationic dyes (>97.7%). Operational conditions such as dye concentrations and applied pressures have limited effects on the rejection of the membrane. An integrated NF-diafiltration process, involving a pre-concentration and a diafiltration step, was specifically designed for the fractionation of dye/NaCl mixtures. This loose NF membrane showed >99.7% rejection to reactive dyes (reactive blue 2 and reactive orange 16) and ca. 99.3% salt removal with ca. 2.0% dye loss after 5.0 diavolumes. However, the NF membrane experienced a 15.9% loss to methylene blue due to the lower rejection to this model cationic dye (97.2%). The current study provides important insights into dye/salt fractionation by loose NF membranes for digital ink-jet printing.

History

Journal

Separation and Purification Technology

Volume

197

Pagination

27-35

Location

Amsterdam, The Netherlands

ISSN

1383-5866

eISSN

1873-3794

Language

English

Publication classification

C1 Refereed article in a scholarly journal

Publisher

ELSEVIER SCIENCE BV