Fig. 3: Desalination performance of SNF-NF membranes under pressure-driven cross-flow filtration mode.
From: Ultra-permeable silk-based polymeric membranes for vacuum-driven nanofiltration
A The influence of SNF coating and IP condition on pure water permeance and Na2SO4 rejection. The error bars of separation performance represent the standard deviation of data from three distinct samples (n = 3). The SNF0-NF0.5 without SNF coating and SNF20-NF0.5 with SNF coating (20 mL of SNF suspension) kept the same IP condition: 0.1 wt% of TMC and 0.5 wt% of PIP; reaction time of the 60 s. To further optimize membrane separation performance, the PIP concentration for fabricating SNF20-NF0.1* and SNF20-NF0.2* membranes was reduced to 0.2 wt% and 0.1 wt%, respectively, and IP reaction time was reduced to 30 s. The rejection test was performed using a feed solution of 1000 ppm Na2SO4 and pure water permeance was determined using DI water. The filtration tests adopted a conventional pressure-driven cross-flow mode with an applied hydraulic pressure of 3 bar. B The trade-off relationship between the water permeance and water-salt (A/BNa2SO4) selectivity of SNF20-NF0.1* and SNF20-NF0.2* membranes compared to other literature data44. C The trade-off relationship between the water permeance and NaCl/Na2SO4 selectivity of SNF20-NF0.1* and SNF20-NF0.2* membranes compared to literature data44.
