Table 1.

Surface roughness parameters of the prepared membranes obtained from analyzing six randomly chosen surface AFM images

Membranes	Roughness parameters
	Mean surface roughness (Ra-nm)	Root mean square roughness (Rq-nm)
Pure PSF	2.9 ± 0.23	3.9 ± 0.47
PSF/GO-0.5	2 ± 0.14	2.5 ± 0.15
PSF/GO-1	2.5 ± 0.30	3.4 ± 0.36
PSF/GO-2	4.4 ± 0.32	5.8 ± 0.50