Phase Inversion Directly Induced Tight Ultrafiltration (UF) Hollow Fiber Membranes for Effective Removal of Textile Dyes

This study has demonstrated the application of tight ultrafiltration (UF) membranes for effective removal of textile dyes from water at a low pressure. Novel UF hollow fiber membranes with well-defined nanopores and surface charges were developed via a single-step spinning process without any post-t...

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Bibliographic Details
Published in:Environmental science & technology 2017-12, Vol.51 (24), p.14254-14261
Main Authors: Han, Gang, Feng, Yingnan, Chung, Tai-Shung, Weber, Martin, Maletzko, Christian
Format: Article
Language:English
Subjects:
Backwash
Color removal
Coloring Agents
Dyes
Fabrication
Fibers
Filters
Fouling
Hollow fiber membranes
Inorganic salts
Low pressure
Membranes
Membranes, Artificial
Molecular weight
Permeability
Porosity
Recovery
Salts
Sodium chloride
Synergistic effect
Textile Industry
Textile industry wastewaters
Textiles
Ultrafiltration
Waste Water
Wastewater treatment
Water Purification
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Summary:This study has demonstrated the application of tight ultrafiltration (UF) membranes for effective removal of textile dyes from water at a low pressure. Novel UF hollow fiber membranes with well-defined nanopores and surface charges were developed via a single-step spinning process without any post-treatment. The newly developed tight UF hollow fibers not only possess a small mean pore diameter of 1.0–1.3 nm with a molecular weight cutoff (MWCO) of 1000–2000 Da but also have a high pure water permeability (PWP) of 82.5–117.6 L m–2 h–1 bar–1. Through the synergistic effects of size exclusion and charge repulsion, the novel UF hollow fibers can effectively remove various dyes with impressive rejections of 93.2–99.9% at 1 bar. At the same time, more than 92% of inorganic salts (i.e., NaCl and Na2SO4) would permeate through the fibers, reducing the detrimental effects of concentration polarization and providing an attracted avenue for salts reuse. The tight UF hollow fibers also exhibit robust performance in a continuous operation of 170 h or at a high feed recovery of 90%. The fouled fibers can be easily regenerated by backwash of water with a flux recovery of larger than 92%. The newly developed tight UF hollow fiber membranes display huge potential for treating textile wastewater and other impaired effluents because of their great separation performance and simple fabrication process.
ISSN:0013-936X
1520-5851
DOI:10.1021/acs.est.7b05340