The issue of reducing organic pollutants in waste water is important and topical. We are looking for new materials that lead to the degradationof these compounds downto the level of CO2 and water, under conditions that are mild and easy to achieve. Thus, the semiconductorpollutantultraviolet radiation systems have proven to be effective in reducing the amount of organicsin waste water. Zinc-based materials (oxide, sulphide, mixtures, simple or doped) show good photocatalytic activities and are suited to the wastewater purification [1-4]. The paper describes synthesis, characterization and photocatalytic performance for the fluorescent ZnS. A simple hydrothermal method is used to synthesize the ZnS nanoparticles. The physico-chemical characteristics of ZnS were analyzed using UV visible spectroscopy, photoluminescence spectroscopy (Figure), scanning electron microscopy and FTIR. Photodegradation experiments were monitored by UV-Vis spectroscopy for anionic or cationic dyes (methylene blue, methyl orangeor phenol red). The ZnS photocatalystis stable and is suitable for several cycles of use without significant reduction in efficiency.