Currently, the used of graphene oxide (GO) nanoparticles in membrane polymer has become major attraction for researchers due to its ability as hydrophilic properties, which can optimize membrane structural morphology surface and performance in filtration process. However, there is still lacking information on the effect of different concentration of GO on membrane performance in filtration process. Therefore, this research has been carried out to identify the effect of GO nanoparticles with different concentration; 0.5wt%, 1.0wt%, 1.5wt%, 2.0wt%, on polysulfone (PSF) polymer membranes. Flux analysis has been conducted to observe membrane performance in filtrate humid acid solution. In addition, phase inversion method has been carried out by preparing dope composition for membrane solution by mixing PEG in 16wt% PSF and 10wt% PEG and the rest was filled by dimethylacetamide (DMAc) as solvent medium. As a result, M2.0 membrane with GO dosage 2.0wt% exhibit lowest contact angle by 41.27° indicated highest hydrophilic properties of the membrane. Moreover, M2.0 membrane showed highest water uptake and porosity with value 361.99% and 82.12%, respectively. The good characterization of M2.0 resulting in highest removal for humid acid with 97% rejection. [ABSTRACT FROM AUTHOR]