REMOVAL OF METHYLENE BLUE DYE FROM TEXTILE SIMULATED SAMPLE USING TUBULAR REACTOR AND TiO2/UV-C PHOTOCATALYTIC PROCESS

In this study, photocatalytic degradation of methylene blue was examined using different concentrations of tio2 nano-particles (diameters less than 21 nm) and ultraviolet (uv-c) radiation in a tubular reactor. different concentrations of catalyst (0.3-1.2 g/l), different ph conditions (3, 7 and 9) and dye concentration (15, 30 and 60 mg/l) as well as sample rotation level (125 ml/min) were studied. the sample passed 1-7 times through the quartz reactor exposed to uv-c ray (constant intensity = 2.8 mw/cm2) (every rotation time was 8 min). results of this research showed clearly that methylene blue is significantly degradable by tio2 and uv-c radiation. increasing dye concentration resulted in decreased efficiency and thus, as more samples passed through quarts tube, removal efficiency increased. methylene blue with concentration of 15 mg/l and after 7 rotations in the reactor (56 min) was removed with the efficiency of 98%. subsequent to dye removal, 47% of initial cod decreased simultaneously.