Effect of air gap distance of PSF/IONPs/ALG hollow fiber membrane on morphology and antifouling properties by Rosid, S. M., Hasbullah, H., Raharjo, Y., Ismail, A .F., Othman, M. H. D., Kadir, S. H. S. A., Kamal, F., Abdullah, M. S., Ng, B. C.