Journal
CARBOHYDRATE POLYMERS
Volume 274, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2021.118664
Keywords
PVDF; Chitosan; CNTs-COOH; Adsorptive membrane filtration; Dye separation; Sustainable development
Categories
Funding
- National Natural Science Foundation of China [51273025]
- Jilin Provincial Science & Technology Department [20170203010GX]
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The adsorptive membrane filtration based on PVDF with CS and CNTs-COOH effectively separates anionic and cationic dye wastewater, with a significant increase in pure water flux. The modified membranes exhibit excellent rejection performance for both individual and mixed dyes, as well as high flux rates for recycling purposes.
An adsorptive membrane filtration based on polyvinylidene fluoride (PVDF) with chitosan (CS) and carboxylated carbon nanotubes (CNTs-COOH) is prepared by method of phase conversion, and the PVDF-CS@CNTs-COOH membranes can effectively separate anionic and cationic dye wastewater. Compared to pure PVDF membranes, PVDF-CS@CNTs-COOH increases pure water flux from 36.39 (L center dot m- 2 center dot h-1) to 85.25 (L center dot m- 2 center dot h-1), an increase of nearly 230%. The membrane exhibits excellent rejection performance in the filtration of six types of dye wastewater. The modified membranes also performed well in terms of rejection of mixed anionic and cationic dyes and also have a high performance in recycling, with a flux of over 94% for both anionic and cationic dyes. In addition, the adsorption curve fitting results showed that the adsorption process was more consistent with the pseudo-second-order adsorption kinetic model and Langmuir mode.
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