Photo-degradation of monoazo dye blue 13 using advanced oxidation process (original) (raw)
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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 H2O2 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, Na2SO4, NaNO3, NaH2PO4) 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–1, the efficiency of the process decreases. The highest decolourisation rates were noted at H2O2 concentrations of approximately 30 mmol∙ℓ–1. The increase of radiation intensity from 730 to 1 950 μW∙cm–2, linearly increases decolourisation efficiency. The inorganic ions investigated have inhibiting effects on RB 19 decolourisation by the UV/H2O2 process with inhibition intensities in the following order: H2PO4– > NO3– > SO42– > Cl–. This study has shown that the UV/H2O2 process is a promising technology for degradation of RB 19 in water and wastewater.
Degradation Characteristic of Monoazo, Diazo and Anthraquinone Dye by UV/H2O2 Process
In this study, the degradation characteristic of monoazo, diazo and anthraquinone dye by UV/H2O2 process was evaluated based on the trend of color, chemical oxygen demand (COD) and total organic carbon (TOC) removal. Three types of dyes consist of monoazo, diazo and anthraquinone dyes were used to compare the degradation mechanism of the dyes. The UV/H2O2 experiments were conducted in a laboratory scale cylindrical glass reactor operated in semi-batch mode. The UV/Vis characterization of monoazo, diazo and anthraquinone dye indicated that the rapid degradation of the dyes by UV/H2O2 process is meaningful with respect to decolourization, as a result of the azo bonds and substitute antraquinone chromophore degradation. However, this process is not efficient for aromatic amines removal. The monoazo MO was difficult to be decolorized than diazo RR120 dye, which imply that number of sulphonic groups in the dye molecules determines the reactivity with hydroxyl radical. The increased in COD removal is the evidence for oxidation and decreased in carbon content of dye molecules. TOC removal analysis shows that low TOC removal of monoazo MO and diazo RR120, as compared to anthraquinone RB19 may indicate an accumulation of by-products that are resistant to the H2O2 photolysis.
Degradation of an azo dye by a fast and innovative pulsed light/H 2 O 2 advanced oxidation process
Dyes and Pigments, 2017
Pulsed light (PL) is a food processing technology initially intended for microbial inactivation that can potentially be applied in other UV-light based processes. PL lamps emit high intensity broad spectrum light from UV to infrared. This research tested the use of PL as part of an advanced oxidation process (AOP) for degrading polluting dyes. Experiments were performed in a batch reactor, and the efficiency of the AOP under different parametric values: dye concentration, pH and H 2 O 2 doses on Direct yellow 106 decolourization was followed by spectrophotometry. Effects on chemical oxygen demand and electrical efficiency were also determined. Decolourization process follows a pseudo-first order kinetic. It was improved by increasing H 2 O 2 concentrations and low pH; while there was little influence of dye concentration, perhaps due to the reactor configuration. The highest constant rate observed was 0.0410 cm 2 / J. The decolourization by PL/H 2 O 2 fits to a typical mechanism of a conventional UV/H 2 O 2 process; since no direct photolysis or thermal effects were observed. Mineralization was incomplete likely due to the highly resonant structure of the dye. An electrical energy per order of 1009 kWh/m 3 /order was calculated. Ninety % of colour removal was reached at 40 J/cm 2 , which is achievable in less than 30 s by most of PL systems existing in the market. The PL/H 2 O 2 process seems to be useful for decolourization of wastewater and could offer the advantage of a very fast degradation.
Photodegradation of an azo dye of the textile industry
Chemosphere, 2002
An advanced oxidation treatment, UV/H2O2, was applied to an azo dye, Hispamin Black CA, widely used in the Peruvian textile industry. Rates of color removal and degradation of the dye have been evaluated. A strongly absorbing solution was completely decolorized after 35 min of treatment, and after 60 min an 82% reduction of the total organic carbon (TOC) was obtained.
Dyes and Pigments, 2002
The photodegradation of three non hydrolysed reactive azo dyes (Reactive red 120, Reactive black 5, Reactive yellow 84) in aqueous solution was investigated in a laboratory-scale batch photoreactor equipped with an immersed lowpressure mercury lamp. Six different doses of hydrogen peroxide, at constant initial concentration of the substrate (100 mg/l) were used. The pseudo-first order rate constants have been calculated from the experimental kinetic curves, for the three azo dyes. These rate constants have extreme values of the order of 0.1 min À1 at a H 2 O 2 dose of 24.5 mmol/l. The effectiveness of the UV/H 2 O 2 process has been evaluated by the degree mineralization of the total organic carbon (TOC), as a complementary indicator of the treatment efficiencies. Our results confirm the suitability of the UV/H 2 O 2 process as a textile wastewater pre-treatment step, once optimum operating conditions and cost effectiveness of the method are established. #
Journal of Photochemistry and Photobiology A: Chemistry, 2006
The degradation of three commercially available textile azo dyes, Solophenyl Green BLE 155% (SG), Erionyl Red B (ER) and Chromotrope 2R (C2R), has been studied by using photochemical and photocatalytic processes under UV irradiation. The adequacy of each process depends on the concentration of dye. At low dye concentration, the neat photochemical degradation is very efficient. The photocatalytic process, using either slurry of Degussa P-25 TiO 2 or a biphasic mixture of TiO 2 and activated carbon (AC), more effectively bleaches heavier colored solutions. The heterogeneous photocatalytic regime was characterized in terms of catalyst load, TiO 2 to AC mass ratio, initial dye concentration and oxygen partial pressure. Catalyst recovery and reuse was also analyzed. Based on the Langmuir-Hinshelwood approach, reaction rates and adsorption equilibrium constants were calculated. A positive effect on the photocatalytic degradation was observed by the addition of AC to TiO 2 catalyst, which was quantified in terms of a synergy factor (R). The efficiencies of different photo-induced degradation processes were compared based on the experimentally determined apparent rate constants, mineralization degrees and initial quantum yields.
Degradation and kinetics of H2O2 assisted photochemical oxidation of Remazol Turquoise Blue
Chemical Engineering Journal, 2012
h i g h l i g h t s " UV/H 2 O 2 AOP approach can efficiently degrade phthalocyanine dyes. " Various ions dramatically effect on the degradation of Remazol Turquoise Blue. " Enzymatic and photolytic degradation of RTB dye produce similar metabolites. " UV/H 2 O 2 and enzyme-based systems may both degrade RTB via similar mechanisms.
Solar light induced and TiO 2 assisted degradation of textile dye reactive blue 4
Chemosphere, 2002
Aqueous solutions of reactive blue 4 textile dye are totally mineralised when irradiated with TiO 2 photocatalyst. A solution containing 4 Â 10 À4 M dye was completely degraded in 24 h irradiation time. The intensity of the solar light was measured using Lux meter. The results showed that the dye molecules were completely degraded to CO 2 , SO 2À 4 , NO À 3 , NH þ 4 and H 2 O under solar irradiation. The addition of hydrogen peroxide and potassium persulphate influenced the photodegradation efficiency. The rapidity of photodegradation of dye intermediates were observed in the presence of hydrogen peroxide than in its absence. The auxiliary chemicals such as sodium carbonate and sodium chloride substantially affected the photodegradation efficiency. High performance liquid chromatography and chemical oxygen demand were used to study the mineralisation and degradation of the dye respectively. It is concluded that solar light induced degradation of textile dye in wastewater is a viable technique for wastewater treatment. Ó
Photodegradation of aqueous solution of Mordant red17 (MR17) azo dye in UV/H 2 O 2 , advanced oxidation process was investigated in this study. Results show that MR17 dye decolorization rate was mainly effected by different parameters such as solution pH, H 2 O 2 concentration, initial dye concentrations and presence of different inorganic anions such as NO 3-, Cl-, CO 3 2-ions. The degradation percent of the dye decreased by the presence of inorganic anions in the order of CO 3 2-> Cl-> NO 3-ions. While increase the temperature of the solution medium from 283 to 318K led to increase the decolorization rate of MR17 dye from 0.048 to 0.164 min-1. The low value of the apparent activation energy E a (24.91 kJ mol-1) indicates that decoloriza-tion process of MR17 dye is achieved easily using H 2 O 2 /UV process. This results further proved by presence of 100% decolorization of MR17 dye in about 50 min and about 85.57% mineralization in a 3.0 h photoperiod.
Degradation of Reactive Dyes by Photoactive Hydrogen Peroxide Oxidation with Ultraviolet Radiation
This work aimed at the discoloration of textile wastewater, containing the reactive dye Red Drimarene X-6BN 150, using UV irradiation in presence of hydrogen peroxide. The UV/H 2 O 2 oxidation process is a feasible and efficient alternative for wastewater treatment from recalcitrant compounds such as reactive dyes. The experiments were conducted using a 24 factorial design for evaluation of the influence of pH, H 2 O 2 , urea and NaCl concentrations in the efficiency of the discoloration process. The results were expressed in percentage of color removal from solution by measurement of absorbance. The H 2 O 2 /UV process was effective for reactive dye degradation, reaching 99% dye removal, in specific conditions. The H 2 O 2 concentration presented mainly significant positive influence on the process. Otherwise, the NaCl concentration had a negative effect in all experiments, decreasing the percentage of color removal from reactive dye. The pH and urea concentration didn't influe...