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. 2020 Jun 30;10(7):137. doi: 10.3390/membranes10070137

Figure 2.

Figure 2

SEM characterization of thin-film composite NF membranes with different concentrations CaCl2 added in the post-treatment: (a) NF-control, (b) NF-10, (c) NF-20, (d) NF-40, (e) NF-80.