Fast green dye has been widely used in histology and cytology. It has been found to have tumorigenic effects in experimental animals, as well as mutagenic effects in both experimental animals and humans. Furthermore, in its undiluted form it poses risks of irritation of eyes, skin, digestive tract, and respiratory tract. For photocatalytic degradation of fast green dye the nano-sized bimetal ternary oxide (CeCrO3) ultrafine powder has been prepared using microwave treatment. It has been characterized by XRD and SEM. The photocatalytic degradation of fast green dye was measured by visible absorption spectroscopy. To obtain the optimal conditions for the dye degradation, the effect of various experimental parameters, i.e. pH, amount of photocatalyst, concentration of dye and light intensity on the rate of reaction was studied. A tentative mechanism for the photocatalytic degradation of fast green was proposed. Photocatalytic degradation of fast green dye followed a pseudo first-order kinetics. It was found that the dye degradation gave the best results at a pH of 7.5, and using a 70 mW·cm–2 light intensity with 0.05 g of nano-sized CeCrO3. At room temperature, the photocatalytic degradation rate constant of fast green dye was k = 4.41·10–4 s–1.
The photocatalytic degradation of methylene blue dye under visible light has been investigated using chromium modified titanium dioxide supported on zeolite (Cr-TiO2/zeolite). The photocatalyst was prepared by sol-gel method and characterized by X-ray diffraction and SEM. The rate of photodegradation of dye was monitored spectrophotometrically. The effect of pH, dye concentration, amount of photocatalyst and intensity of light on the rate of photocatalytic reaction was observed. The results showed that the use of Cr-doped TiO2 increased the rate of photocatalytic degradation of methylene blue as compared to untreated TiO2. The photocatalytic mechanism of Cr-TiO2 catalyst has been tentatively discussed. Keywords: Methylene blue, zeolite, chromium, photocatalytic degradation
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