| Summary: | In this study, the basal spacing of montmorillonite (MMT) was modified through ion exchange. Two kinds of MMT were used: sodium-modified MMT (Na-MMT) and organo-modified MMT (O-MMT). These two particles were incorporated separately into the thin-film nanocomposite polyamide membrane through the interfacial polymerization of piperazine and trimesoyl chloride in n-hexane. The membrane with O-MMT (TFN<sub>O-MMT</sub>) has a more hydrophilic surface compared to that of membrane with Na-MMT (TFN<sub>Na-MMT</sub>). When various types of MMT were dispersed in the n-hexane solution with trimesoyl chloride (TMC), O-MMT was well-dispersed than Na-MMT. The poor dispersion of Na-MMT in n-hexane led to the aggregation of Na-MMT on the surface of TFN<sub>Na-MMT.</sub> TFN<sub>O-MMT</sub> displayed a uniform distribution of O-MMT on the surface, because O-MMT was well-dispersed in n-hexane. In comparison with the pristine and TFN<sub>Na-MMT</sub> membranes, TFN<sub>O-MMT</sub> delivered the highest pure water flux of 53.15 ± 3.30 L∙m<sup>−2</sup>∙h<sup>−1</sup> at 6 bar, while its salt rejection for divalent ions remained at 95%–99%. Furthermore, it had stable performance in wide operating condition, and it exhibited a magnificent antifouling property. Therefore, a suitable type of MMT could lead to high separation efficiency.
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