Physical modification of support layers (SLs) for thin‐film composite (TFC) forward osmosis (FO) membranes is the main goal of this study. Accordingly, the strategy of metal–organic framework (MOF)‐based porous matrix membrane (PMM) was used for the fabrication of controllable SLs. Fourteen different TFC FO membranes were successfully fabricated by interfacial polymerization (IP) technique over the fourteen different SLs made of polyetherimide (PEI), polyethersulfone (PES), and twelve MOF‐based PMM. The controllable MOF particles, fabricated SLs, and TFC membranes were characterized by Fourier‐transform infrared spectroscopy (FTIR), powder X‐ray diffraction (PXRD), dynamic light scattering (DLS), field emission scanning electron microscopy (FESEM), X‐ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), contact angle (CA), inductively coupled plasma (ICP), and developed SHN1 method. The results showed that the PMM strategy can lead to an increase in the degree of crosslinking of polyamide (PA) as a result of physical modification of the original SLs. Also, the PMM strategy reduced the structural parameters and hence the internal concentration polarization (ICP) was controlled. However, according to the characteristic curve, physical modification of the structure of PES and PEI by MOF‐based PMM strategy caused a small and dramatic effect (respectively) on the performance of the TFC FO membranes.

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