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

Abstract

Photocatalytic discoloration kinetics of Reactive Black 5 (RB5), a vinylsulfone dye, has been studied spectrophotometrically 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 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 (PCO) permits 30.8% of RB5 degradation. The degradation of dye was studied under a variety of conditions such as volumetric flow rate, initial pH, photocatalyst reuse, and in the presence of electron acceptor such as sodium persulphate ((Na) 2 S 2 O 8 ). 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. When UV light was used in the presence of photocatalyst, 50 min was enough for quasi-total removal of RB5 with 2 8 2 S O  (0.2 M).

Impact of Powdered Activated Carbon and Anion Exchange Resin on Photocatalytic Treatment of Textile Wastewater

“…Therefore, also the pH might have influenced the PCO efficiency. Kodom et al [19] ascertained that photocatalysis of Reactive Black 5 with TiO 2 coated on paper showed the highest efficiency at pH 3, while the activity was less at pH 7. This was explained by predominance of negatively charged surface groups on the photocatalyst surface at pH 7 resulting in decreased adsorbability of the dye's sulfonate groups.…”

“…Rauf et al [4] reviewed the photocatalytic degradation of azo dyes in the presence of TiO 2 doped with transition metals. Alahiane et al [17], Chebli et al [18], and Kodom et al [19] have tested PCO of dye solutions with TiO 2 supported on carriers. Solar PCO of the azo dye Acid Orange 7 resulted in considerable color and TOC removal even in North Germany in October [20].…”

Surface-Modified Adsorbent from Artocarpus heterophyllus Lam Biomass to Confine Reactive Red 194 in Real and Synthetic Effluents: Kinetics and Equilibrium Study

“…However, TiO 2 powder is easy to agglomerate, has poor adsorption capacity, and is difficult to separate and recycle from the solution, which are some of the downsides of using TiO 2 in advanced oxidation processes. For instance, many papers have suggested either adsorption or photocatalysis or by both through different combination of methods such as dip-hydrothermal using peroxotitanate as the TiO 2 precursor for degradation of methyl orange, sol-gel method for the degradation of methylene blue, impregnation and physicochemical pyrolysis, photocatalytic decomposition of an azo dye pollutant, and microwave-induced photocatalytic technology using TiO 2 /AC composites [18][19][20][21]. For the purpose of overcoming, the drawback as well the activated carbon acts as a substrate for making a composite of adsorbents from a less value product to work with large scale and reproducibility.…”