removal of acid yellow-36 dye from textile industries waste water using photocatalytic process (uv/tio2)

Textile industries are the major industries which mainly use different dyes. in these industries it is estimated that 15 % of dyes are lost in wastewater during manufacturing and dying process. in this study, the photocatalytic degradation of yellow acid-36 dye in the presence of uv irradiation intensity has been investigated. in this experiment tio2 p-25 was used as catalyst and coated on the marble surface. the influence of various operation parameters, such as the initial concentration of dye, ph, time of contact, catalyst dosage and uv irradiation intensity on the degradation process was examined. the results indicated that the optimal decolorization conditions were attained with 100 g m-2 of catalyst at ph 3, an irradiation time of 105 min, uv irradiation intensity 30 w and 5 mg l-1 initial concentration of dye. the process resulted in 97.6% degradation of yellow acid 36. it is revealed that this method was effective in degradation of yellow acid 36.