Nano-ZnO was fabricated by a parallel flow precipitation with the assistance of 1-hexadecyl-3-methylimidazolium bromide.The prepared photo-catalysts were studied by BET surface area,X-ray diffraction(XRD),UV / Vis diffuse reflectance and surface photovoltage spectra(SPS) techniques.The activity of photo-catalysts for photo-catalytic decolorizaation of methyl orange(MO) solution was evaluated.The results show that adding 1-hexadecyl-3-methylimidazolium bromide into the synthetic system make the BET surface a...