摘要：In recent years, array of industrial activities have been disturbing the water quality by release of various contaminants like dyestuff, heavy metal ions and many other organic substances. Discharges containing dyes, in particular, are to be controlled due to their highly toxic nature. These dyes are commercially important chemicals and frequently used in dying, printing, textile, photoghaphy, food and cosmetic industries. Despite of their importance, dyes are toxic and carcinogenic in nature. Environmental contamination by these toxic chemicals is causing serious global problems. The photocatalytic degradation of safranine O dye was carried out using MnO2 as semiconductor. Solution was prepared in distilled water and visible light was used as the source of energy. The effect of various parameters like amount of semiconductor, pH, light intensity, dye concentration etc. on the photodegradation is investigated. A tentative mechanism has been proposed.
