Photocatalytic Degradation Of Textile Dye Research Articles

Highly active mesoporous SiO2-TiO2 based nanocomposites for photocatalytic degradation of textile dyes and phenol

Titania-silica nanocomposites (20% SiO 2 -TiO 2 , 30% SiO 2 -TiO 2, 40% SiO 2 -TiO 2 and 50 % SiO 2 -TiO 2 ) with tailored morphology and tunable band energy have been synthesized successfully via micro emulsion method. The morphology, chemical composition, band gap energy and stability of prepared nanocomposites were investigated by XRD, SEM/EDX, FT-IR, DRS and TGA. While textural parameters such as surface area, pore volume, and pore diameter were evaluated by nitrogen adsorption-desorption isotherms. The prepared nanocomposites were employed for photocatalytic degradation of phenol and dyes (methyl yellow, auramine O, turquoise blue G) under visible light irradiations. The results of photocatalytic degradation and kinetic parameter (K app ) strongly suggest that 20% SiO 2 -TiO 2 showed remarkable photocatalytic efficiency in comparison to SiO 2 -TiO 2 nanocomposites with high silica contents. These findings proved significantly that 20% SiO 2 -TiO 2 have marked impact on the photocatalytic efficiency due to its high pore volume, more diameter, high availability of anatase TiO 2 in nanocomposite and reduced bandgap energy.

Photocatalytic Degradation of Textile Dyes in a Tio2/uv System

This study is focused on development of a method of TiO2 immobilization, convenient for the wastewater remediation (especially for the degradation of textile dyes) and cheap for an industrial operation. An influence of selected operational parameters on process performance was verified. Methylene Blue was chosen as the model dye, however, a possibility of decolorization of other dyes was also tested. Two different ways of TiO2 immobilization were examined. An application of polyvinylalcohol (PVA) revealed to be more convenient for our purposes than application of the polyacrylamide (PA), as the observed degradation rate was much faster with the PVA. When TiO2 was immobilized in PA gel, the effects of the volumetric flow rate of the treated liquid through the photoreactor, wavelength of the UV light and the amount of immobilized TiO2 on decolorization process were negligible. Higher light intensity made the dye degradation substantially faster.

Visible light irradiate photocatalytic degradation of textile dye with a newly developed photocatalyst MBIR Dowex 11

Visible light irradiate photocatalytic degradation of textile dye with a newly developed photocatalyst MBIR Dowex 11

Photocatalytic degradation of textile dyes by hydrogel supported titanium dioxide nanoparticles

Abstract Background: Textile industry has been condemned as one of the world's worst offenders in terms of pollution because 10-15% of all the dyes used in the industry are lost within wastewater during processing. The

Effect of Support on the Photocatalytic Degradation of Textile Effluents Using Nb2O5 and ZnO: Photocatalytic Degradation of Textile Dye

Photocatalysis is an alternative for industrial effluents degradation, which is capable of mineralizing compounds. This study evaluated the photodegradation of textile dye using Nb2O5 and ZnO supported on zeolite and activated carbon. ZnO/NaX was the most efficient catalyst, with color removal of 98% for dye solutions at 10 mg L−1, following pseudo-first order kinetics.

Photocatalytic Degradation of Textile Dye and Wastewater

In this study, the photocatalytic degradation of commercial azo dye (Remazol Red 133) in the presence of titanium dioxide (TiO2) suspensions as photocatalyst was investigated. The effect of various operational parameters, such as pH of dye solution and catalyst concentration on the photocatalytic degradation process, was examined. The mineralization of dye was also evaluated by measuring the chemical oxygen demand of the dye solutions. The extent of photocatalytic degradation was found to increase with increasing TiO2 concentration. For the Remazol Red dye solutions, a 120-min treatment resulted in 97.9% decolorization and 87.6% degradation at catalyst loading of 3 g/L. Experiments using real textile wastewater were also carried out. Textile wastewater degradation was enhanced at acidic conditions. The decolorization and degradation efficiencies for textile wastewater were 97.8% and 84.9% at pH 3.0, catalyst loading of 3 g/L, and treatment time of 120 min.

Improved Photocatalytic Degradation of Textile Dye Using Titanium Dioxide Nanotubes Formed Over Titanium Wires

Titanium dioxide (TiO2) nanotubes formed by anodization over titanium wires show a significant improvement in photocatalytic activity compared to the nanotubes formed over foils. This is evident when the fractional conversion of a textile dye, methyl orange, increased from 19% over a foil to 40% over wires in the presence of nanotubes of identical dimensions illuminated over the same geometrical area. Higher degradation rates with Pt-TiO2 nanotubes over foils are matched by the Pt-free TiO2 nanotubes over the wires. The higher photocatalytic activity over the anodized wires can be attributed to the efficient capture of reflected and refracted light by the radially outward oriented TiO2 nanotubes formed over the circumference of the titanium wire. The formation of TiO2 nanotubes over wires can be considered as an effective alternate to improve photodegradation rates by avoiding expensive additives.

Photocatalytic degradation of textile dye C.I. reactive orange 16 in TiO2 water suspension by simulated solar light

The photodegradation of C.I. Reactive Orange 16 (RO16), commonly used as a textile dye, was investigated using TiO2 as a catalyst and the sun lamp. The experiments showed that TiO2 and simulated solar light are necessary for the effective photodegradation, although a low degradation/adsorption was observed when only the simulated solar light or TiO2 was used. The effect of some parameters such as the initial concentration of the catalyst, the initial dye concentration, the initial Na2CO2 and NaCl concentrations, pH, and the presence of H2O2 on photodegradation of RO16 was examined. The photodegradation efficiency was highest at the catalyst concentration of 2.0 g/l. The degradation was faster in the acidic than in alkaline pH range. High adsorption of the dye was observed at low pH, while at high pH almost no adsorption was detected. A lower concentration of Na2CO2 decreased the photodegradation of RO16, while a higher concentration increased the photodegradation. The presence of NaCI led to the inhibition of the photodegradation process. The low concentration of H2P2 increased the RO16 photodegradation efficiency, while at higher concentration of H2O2 inhibition was observed.

Photocatalytic degradation of textile dye X-3B using polyoxometalate–TiO 2 hybrid materials

Titanium dioxide functionalized with Keggin type polyoxometalate (POMs) [X n+ W 12O 40] (8− n)− (XW 12; X n+ = P 5+, Si 4+, Ge 4+) were prepared by sol–gel method. The Keggin structure and dispersion state of POMs were monitored by FT-IR and XRD. The composites showed higher photocatalytic activity than pure TiO 2, pure POMs or mechanical mixture of TiO 2 and POMs for X-3B degradation. Among the three POMs–TiO 2 hybrid materials, the reactivity was: PW 12 > SiW 12 > GeW 12. With different loading weights for the same POMs, the reactivity followed the order: 30 wt.% > 15 wt.% > 45 wt.%.

Photocatalytic decolorization of wastewater dyes

ABSTRACT: The photocatalytic decolorization of municipal waste‐water contaminated with textile dyes was studied using a batch reactor. Degussa P25 titanium dioxide was used as the photocatalyst and proved to be effective for dye degradation when irradiated with UV light in the presence of air. In addition to removing the color from the wastewater, the photocatalytic reaction simultaneously reduced the COD which suggests that the dissolved organics had been oxidized. The activation energy for the photocatalytic decolorization reaction was only about 3 to 6 kJ/mole indicating a weak temperature dependence of the rate. These results suggest that the photocatalytic degradation of textile dyes may be a viable method for decolorizing and oxidizing organics in wastewater.