Figure 4. Water flux and salt rejection of the TFC membranes prepared at different temperature in 0.2 wt.% TMC-heptane solution.

The surface and cross-sectional images of the membranes synthesized at −20 °C and 50 °C are presented to justify the permeation properties. Test conditions: feed solutions: pure water and 2000 ppm NaCl solution, pressure: 1.52 Mpa (220 psi), temperature: 25 °C, pH: 6.5–7.