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SEM images of the coated filters. (a) Melt-blown filter immersed in 0.12 M ZnO nanoparticles solution for 5 min, (b) melt-blown filter immersed in 0.12 M ZnO nanoparticles solution for 50 min and (c) needle-punched filter immersed in 0.12 M ZnO nanoparticles solution for 0.5 min.
