Comparative Studied of Degradation of Textile Brilliant Reactive Red Dye Using H2O2, TiO2, UV and Sunlight (original) (raw)
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Photocatalytic Decolourization of Textile Effluent Containing Reactive Red 120 Dye with UV/TIO2
American Journal of Engineering and Applied Sciences, 2013
The efficiency of degradation of an aqueous solution of reactive red 120 dye using Advanced Oxidation Process (AOP) was evaluated. A low pressure UV lamp and a combination of UV/TiO 2 were tested using ten different dye concentrations (50-500 mg/L) at several retention times (5.2-60 min) a pH of 10.5. The effect of acidic pH (pH = 3) on dye removal efficiency and the Chemical Oxygen Demand (COD) of the treated effluents were also investigated. When the alkaline (pH = 10.5) reactive red 120 dye solutions were treated using a low pressure (380 nm intensity) UV lamp, a maximum degradation efficiency of 27.01% was obtained for the least concentrated dye (50 mg/L) solution and only a degradation efficiency of 0.33% was obtained for the most concentrated (500 mg/L) dye solution. When the alkaline (pH = 10.5) reactive red 120 solutions were exposed to a combination of UV/TiO 2 , a maximum degradation efficiency of 46.70% was obtained for the lease concentrated (50 mg/L) dye solution after 60 min and only a degradation efficiency of 2.84% was obtained for the most concentrated (500 mg/L) dye solution after 60 min. When the pH of the reactive red 120 dye solution was reduced to 3, a degradation efficiency of 56.45% was obtained for the least concentrated (50 mg/L) dye solution at 60 min and a degradation efficiency of 14.94% was obtained for the most concentrated (500 mg/L) dye solution at 60 min. However, the increase in degradation efficiency obtained in this study does not justify the cost of chemicals added to adjust the pH to 3 before treatment and then to 7 before final disposal. Also, the addition of chemicals (to adjust the pH) increases the COD of the dye solution thereby necessitating a further costly treatment.
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
1999
The effectiveness of the advanced oxidation process (UV/H 2 O 2) in decolorizing real textile wastewater polluted with commercial reactive dyes-Reactive Yellow 84 and Reactive Red 141was investigated. All the experiments were performed in a lab-scale reactor with the original high pH of the wastewater. The dyeing wastewater was decolorized in 5 hours. After its acidification to pH 3 the decolorization process was more efficient. Full decolorization was then achieved in 2 hours and the decrease in COD exceeded 70%. The reaction rate constants obtained were as follows: at pH 11.4, 0.0065 min-1 ; at pH 7, 0.0044 min-1 , and at pH 3, 0.019 min-1 , which testified to pH importance for UV/H 2 O 2 oxidation process.
Iraqi Journal of Chemical and Petroleum Engineering
The azo dye brilliant reactive red K-2BP (λmax = 534 nm) is widely used for coloring textiles because of its low-cost and tolerance fastness properties. Wastewaters treatment that contains the dye by conventional ways is usually inadequate due to its resistance to biological and chemical degradation. During this study, the continuous reactor of an advanced oxidation method supported the use of H2O2/sunlight, H2O2/UV, H2O2/TiO2/sunlight, and H2O2/TiO2/UV for decolorization of brilliant reactive red dye from the effluent. The existence of an optimum pH, H2O2 concentration, TiO2 concentration, and dye concentration was taken from the batch reactor experiments. The best conditions were pH=3, H2O2 dosage = 500 ppm, TiO2=100ppm and dye concentration=15 ppm .Under the most effective conditions, complete removal of the dye solution was achieved with different flow rates (10, 30, 60) ml/min. At flow rate of 10 ml/min, the percentage of decolorization were (80.47%, 84.65%, 89.42%, 77.5%) and ...
Decolouration of textile dyes in wastewaters by photocatalysis with TiO2
Solar Energy, 2005
The photocatalytic removal of colour of a synthetic textile effluent, using TiO 2 suspensions under solar radiation, has been studied at pilot plant scale. A synthetic dye solution was prepared by a mix of six commercial textile dyes. A photochemical reactor of parallel CPC reflectors with UV-transparent tubular receivers was used. The study of photodegradation was carried out using the TaguchiÕs parameter design method. Following this methodology, the reaction was conducted under different flow conditions, pH and H 2 O 2 concentrations. The results show that all dyes used in the experiences can be degraded successfully by photo-oxidation. The process shows a significant enhancement when it is carried out at high flows, alkaline media and high H 2 O 2 concentration. Colour removal from the effluent was reached at 55 min operating time.
Photocatalytic Degradation of Reactive Yellow Dye in Wastewater using H 2 O 2 /TiO 2 /UV Technique
In the present study, advanced oxidation treatment, the TiO2 /UV/H2O2 process was applied to decolourisation of the reactive yellow dyes in aqueous solution. The UV radiation was carried out with a 6 W low-pressure mercury lamp. The rate of colour removal was studied by measuring of the absorbency at characteristic wavelength. The effects of H2O2 dosage, dye initial concentration and pH on decolourisation kinetics in the batch photoreactor were investigated. The highest decolourisation rates were observed (98.8) at pH range between 3 and 7. The optimal levels of H2O2 needed for the process were examined. It appears that high levels of H2O2 could reduce decolourisation by scavenging the *OH. The colour degradation rate decreases as the dye concentration increases. The rate coefficient (k=0.0319 min-1) of degradation, follows the pseudo-first-order kinetics.
Removal of Textile Dye from Aqueous Media Using an Advanced Oxidation Process with UV/H2O2
IOP Conference Series: Materials Science and Engineering
This study investigated the treatment of water contaminated with textile dye (Cibacron Red FN-R, reactive red 238) using a UV/H2O2 process. The reaction was influenced by the input concentration of hydrogen peroxide H2O2, pH, temperature, and the concentration of textile dye in the wastewater. Analysis of the experimental results displayed both first order and the second order reactions. The reaction type was found to be of a first order throughout the systems. The removal efficiency of the UV/ H2O2 process at optimal conditions and dosage (H2O2 = 25 mg/L, pH=3, temperature =20 ˚C for 50 mg/L dye concentration) were found to be 80.633% , 97.07%, and 99.43% at 60 min, 120 min, and 180 min, respectively with K1 = 0.0293 min-1 and R2=0.9992%. COD removal was also studied for the UV/H2O2 process and found to be 62.5%.
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...
Decolorization of Textile Dyes by Immobilized Photocatalytic Degradation Process
irphouse.com
The photocatalytic degradation of various dyes (Reactive Black-5 (RB-5), Red (ME4BL), Golden yellow (MERL), Blue-222, Methylene Blue, and Malachite Green) has been studied, using TiO 2 (P25) as a photocatalyst. Experiments were conducted in continuous immobilized photocatalytic reactor and show effective decolorization of all textile dye solutions. The thin film immobilized surface photo-reactor was able to give nearly 90-98% color removal depending on the initial concentration and exposure time. Flow rate has noticeable effect on color removal particularly at higher concentration. This process was found to be effective for the decolorization of textile wastewater.
Chemical Industry, 2015
The effectivness of UV/H2O2 process, Fenton and photo-Fenton process at decolorization of commercially important textile dyes Reactive Orange 4 (RO4) and Reactive Blue 19 (RB19) was evaluated. The effect of operational condition such as initial pH, initial H2O2 concentration, initial Fe2+ concentration and initial dye concentration on decolorization of RO4 and RB19 was studied. The photo-Fenton process is found to be more efficient than UV/H2O2 and Fenton process for decolorization of simulated dye bath effluent and solutions of the dyes in water alone under optimum conditions. In simulated dye bath the removal efficiency was slightly lower than for the solutions of the dyes in water alone for both dyes types. The results revealed that the tested advanced oxidation processes were very effective for decolorization of RO4 and RB19 in aqueous solution.