TiO sub( 2) PC500 Coated on Non Woven Paper with SiO sub( 2) as a Binder-Assisted Photocatalytic Degradation of Reactive Black 5 in Aqueous Solution

Photocatalytic discoloration kinetics of Reactive Black 5 (RB5), a vinylsulfone dye, has been studied spectrophotomet- rically by following the decrease in dye concentration with time at ambient conditions using a flow loop reactor. UV lump, Black Light Blue (BLB) emitting at maximum wavelength of 365 nm and Ahlstrom Research Service paper consistent of TiO sub( 2) P500 coated on non woven paper was used respectively as source of UV light and photocatalyst. At natural pH, the result shows that, photolysis of RB5 and its adsorption in the presence of photocatalyst was negligible while the photocatalytic oxidation permits 30.8% of RB5 degradation. The degradation rates were found to be strongly influenced by all the above parameters. The circulation flow rate of 108 L/h was the best. The rate constant calculated when the initial pH was varied shows that, pH 3 was more favorable for RB5 removal. Peroxydisulphate ions have the strong effect on RB5 discoloration even in dark without and with photocatalyst.