Journal
DESALINATION
Volume 479, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.desal.2020.114330
Keywords
Thin film composite (TFC); Carboxyl single-walled carbon nanotubes; Interfacial polymerization; Tubular crumples; Nanofiltration membrane
Categories
Funding
- National Key Research and Development Project of China [2016YFC0400803]
- Fundamental Research Funds for the Central Universities [2018853314]
- National Natural Science Foundation of China [51708543, 51738013]
- 111 Project [B17015]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Membranes having excellent water permeability and high salt rejection are needed for developing nanofiltration technology. In the present work, a modified interfacial polymerization involving low-concentration monomers was utilized to synthesize an ultrathin polyamide (PA) layer. Carboxylated single-walled carbon nanotubes (COOH-SWCNT) were embedded into the ultrathin PA layer. The resultant additional molecular transportation pathways could reduce the trade-off effect. Besides, the morphology of ultrathin PA layer was sensitive to the presence of nanofillers, and contributed to a rougher surface of the thin film nanocomposite (TFN) membrane. As a result, the permeable area was increased, which is beneficial for water permeation. At the optimized COOH-SWCNT dosage of 0.001 wt%, even tubular crumples appeared on the fabricated membranes. Thereby, the membrane achieved an ultrahigh water permeance of 22.67 L.m(-2).h(-1).bar(-1) while maintain a high rejection for divalent salt. For example, the rejection of Na2SO4 and MgSO4 were 95.69% and 90.03%, respectively. These excellent results were achieved using low loadings of nanofillers and under relatively low pressure (3.5 bar). The current work provides a feasible method to adjust the morphologies of NF membrane for improving its performance. And this is a promising approach due to its simplicity, and low consumptions of materials and energy.
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