Effects of system parameters and inorganic salts on the photodecolourisation of textile dye Reactive Blue 19 by UV/H₂O₂ process

Abstract

The photodecolourisation of textile dye Reactive Blue 19 (RB 19), an anionic anthraquinone dye of the reactive class, was investigated using UV radiation in the presence of H 2 O 2 in a batch photo-reactor with low-pressure mercury lamps. The effects of the system parameters: initial pH, initial dye concentration, concentration of peroxide and radiation intensity, as well as the presence of salts, (NaCl, Na 2 SO 4 , NaNO 3 , NaH 2 PO 4 ) on dye decolourisation was examined. Increasing the initial pH resulted in an increase in decolourisation efficiency. Results showed that with an increase of dye concentration from 10 to 100 mg•ℓ This study has shown that the UV/H 2 O 2 process is a promising technology for degradation of RB 19 in water and wastewater.

ANN prediction of the decolourisation efficiency of the organic dyes in wastewater by plasma needle

“…20 Having a standard reduction potential of E 0 = 2.85 V, it could initiate decolourisation reactions by reacting with the dye molecules with a high reaction rate (≈10 9 L mol -1 s -1 ). 29 Chemical properties (possibility of oxidation, biodegradation) of the dyes are related to the chemical structure of each dye. Three textile dyes were chosen as representatives because of their different structures.…”

“…All three dyes are characterized by high chemical stability and resistance to conventional physical and chemical degradation processes due to their complex, aromatic compositions. 29,30 The oxidation rate of the dyes was determined following the colour loss (decolourisation) process. It was the evidence that the chromophore group that was responsible for the absorption of the dye molecule in the visible region of the spectral range had been eliminated.…”

A Cellulose‐Based Adsorbent using Box‐Behnken Design for the Adsorption of Reactive Blue 19 Dye from Simulated Wastewater

“…[11] In that context, various dye removal methods have been developed in the past to remove dyes from wastewater. Some of these physicochemical and biological methods used for dye remediation are electrochemical, [12] photo-Fenton catalysis, [13,14] ozone treatment, [15] UV photolysis, [16,17] photolytic membrane, [18] advanced oxidation, [19,20] and nanocomposite. [21][22][23] Unfortunately, all these treatment methods have certain limitations such as complex techniques, high operation costs, generation of sludge and toxic by-products, low flux, and high membrane fouling.…”