Fig. 4. Nanofiltration performances of the PA composite membranes. (a) Effects of different TpTG_Cl deposition densities on water permeance and Na₂SO₄ rejection. (b) Effects of different inorganic salt solutions on permeation flux and rejection. (c) Variation of permeation flux and Na₂SO₄ rejection under a permeating duration of 30 h. (d) Variation of permeation flux and Na₂SO₄ rejection at different applied pressures. (e) NF performance comparison between our membrane and other membranes reported in the literature.