Investigation of the Photodegradation of Reactive Blue 19 on P-25 Titanium Dioxide: Effect of Experimental Parameters

Abstract

The photocatalytic decolorization and degradation of an anthraquinone-based reactive dye, C.I. Reactive Blue 19, was carried out in laboratory-scale experiments with the systematic variation of several operational parameters, including electron acceptor (hydrogen peroxide) concentration, initial pH, use of buffer solution, aeration, and the specific chemical nature of the buffer solution. Photodegradation was performed under simulated natural light, and conditions were chosen to mimic those found in industry. Mineralization and decolorization were monitored by UV-vis spectroscopy and total organic carbon analysis, and kinetics were modelled using an in-series first-order combination mechanism. Reaction products were examined and monitored by high-resolution mass spectrometry. Under the conditions explored, the reaction rate was found to depend not only on pH and electron acceptor concentration, but also on the specific chemical nature of the buffer used.

Bio-mimicking TiO2 architectures for enhanced photocatalytic activity under UV and visible light

“…The experimental conditions were set according to the literature. [41][42][43][44] The solution pH was maintained at 7 to exclude the effects of acidity and alkalinity on the photocatalytic activity. The reaction solution was prepared by dispersing 15 mg…”

Hydrothermal synthesis of mixed phase blue titanium dioxide from oxalate stabilised sols

“…As more NH 4 F was added the anatase phase content remained stable at approximately 60%. The literature sates that when NH 4 F is present anatase phase would dominate [15], however as we previously reported oxalic acid in sols favours rutile phase at the higher temperature of hydrothermal treatment [13]. It would appear that above 0.25 equivalents NH 4 F the influence of the F ion overcomes that of the oxalate.…”

“…Photoactivity measurement was performed using RB19 reactive blue dye as described by Abu Bakar et al [15]. Briefly, in a quartz 170 mL vessel, 30 mg of synthesised titania powder was ultrasonically dispersed into a 100 mL of RB19 stock solution (0.000127 mol/L).…”

Removal of an anionic reactive dye from aqueous solution using functionalized multi-walled carbon nanotubes: isotherm and kinetic studies

“…Reactive Blue 19 is an anionic reactive dye which is very resistant to decolorization due to the fact that its aromatic anthraquinone structure is highly stabilized by resonance [5]. Also, researchers are concerned about toxicity and mutagenicity of RB19 because of the vinyl sulfone groups present in the RB19 structure [6][7][8][9][10].…”