The photodegradation of tri dyes (original) (raw)
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Al-Nahrain Journal for Engineering Sciences
In this study sunlight and UV radiation were used to compare the efficiency of decolorization of textile wastewater containing brilliant reactive red dye K-2BP (λmax = 534 nm) by the advanced oxidation process (AOP) using (H2O2/sunlight, H2O2/UV, H2O2/TiO2/sunlight, and H2O2/TiO2/UV). The results studied the effect of solution pH, applied H2O2 concentration, TiO2 concentration (nanoparticle), and initial dye concentration were studied. The experimental results showed that decolorization percentage with H2O2/sunlight and TiO2/H2O2/sunlight under the following conditions: - reaction time 150 of minutes, [ 500 ppm] H2O2, [100 ppm] TiO2, pH=3, initial dye concentration =15 ppm and at ambient temperature were 95.7% and 98.42% respectively. For the same conditions using H2O2/UV, H2O2/TiO2 /UV, the percentage of decolorization were 97.85% and 96.33% respectively. The results also indicated that the sunlight is more economic and cost-effective than UV radiation.
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 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.
Journal of Saudi Chemical Society, 2017
This paper is a report on a research into the impact of different parameters of current density, anode type, temperature, pH, and electrolyte concentration on the removal of Reactive Red 120 in synthesized wastewater through electrocoagulation using solar energy for the purpose of improving economic efficiency of the process. Current density of 45 Am À2 proved to be optimum level for dye removal. Other optimum alternatives were iron anode, a temperature level of 25°C, a pH of 7, and an electrolyte concentration of 15 mg L À1. The characterization of the post-treatment product using GC-MS studies revealed intermediate compounds. Cost analysis was also performed for the treatment process. Further, the obtained optimum conditions were applied to the treatment of six samples of real textile effluent. Electrocoagulation was satisfactory in only four of the cases. Lastly, efficiency of treating the real samples was evaluated by subjecting the experimental electrodes to the SEM technique.
Optimization of the Photochemical Degradation of Textile Dye Industrial Wastewaters
ASEAN journal on science & technology for development, 2017
In this study, the photochemical degradation via photo-Fenton process was carried out to degrade dyes in textile industrial wastewaters. Experimental design methodology was also applied for optimizing effects of factors which influence the effective treatment such as ferric dose, hydroperoxide dosage, initial pH, reaction time and initial chemical oxygen demand (COD). Two independent variables namely colour and COD removal efficiencies were used to evaluate the treatment yield. Under the optimal conditions, ca. 99% and ca. 88%, colour, and COD were removed, respectively.
A ccomparative study on the treatment methods of textile dye effluents
Journal of chemical and pharmaceutical research, 2012
Textile and dyeing industries are responsible for contaminating water due to discharge of coloured effluents. So water pollution due to colour from textile and dyestuff industries is a topic of major concern of scientist today. The removals of dyes present in these industrial effluents have been received great potential in last few years. It is due to increasing environment awareness and implementation of ever strict environmental rules. These textile effluents are highly toxic as they contain a large no of metal complex dyes. These high concentrations of dyes causes may water borne diseases and increase the BOD level of receiving water. In the present paper various methods of treatment of textile effluent have been studied and discussed to find out effective treatment of textile effluents. In present years colour effluents is treated by so many techniques like Chemical oxidation, Ozonation, Ion exchange process, Electrochemical process, Electrolytic precipitation, Foam fractionatio...
[2012] Photo and Electrocatalytic Treatment of Textile Wastewater and Its Comparison
Electrochemical and photochemical techniques have been proved to be effective for the removal of organic pollutants in textile wastewater. The present study deals with degradation of synthetic textile effluents containing reactive dyes and assisting chemicals, using electro oxidation and photo catalytic treatment. The influence of various operating parameters such as dye concentration, current density, supporting electrolyte concentration and lamp intensity on TOC removal has been determined. From the present investigation it has been observed that nearly 70% of TOC removal has been recorded for electrooxidation treatment with current density 5 mA/dm 2 , supporting electrolyte concentration of 3 g/L and in photocatalytic treatment with 250 V as optimum lamp intensity nearly 67% of TOC removal was observed. The result indicates that electro oxidation treatment is more efficient than photocatalytic treatment for dye degradation.
Photocatalytic Treatment of Textile Industrial Wastewater
International Journal of …, 2010
Due to increasing population and industrial developments, share of overall water use in the world is rising day by day. The aim of this paper is to study the quality wastewater from synthetic textile fiber industry and its treatment methods together in Iran. Generally, industrials product the synthetic fibers in the textile industry including height contaminants PH, azo dyes, BOD, TDS, toxicity as a result of the industrial activities. At different stages of the synthetic textile fibers, most processing involves polymerization, washing, dyeing, Turkish & Salt and drying. The data were collected from a sample of N=27, which is actually not very large, given that we have. A one-way ANOVA between-groups analysis of variance was conducted. The experimental results show there is not statistically significant different between processes at the p>0.5 in PH but BOD, TDS and water consumption is a statistically significant difference between fife processes at p<0.5 in kinds of the synthetic textile industries. Synthetic textile fibers industry effluents should be discharged to the environment after various treatments. The synthetic textile wastewater has higher than various pollutant parameters to other textile industry (especially un-polymerized monomers, silicate and azo dyes). To treat of the color loud of dyed wastewater as well as recycling monomers and biological degradation is difficult. Currently, recycling and the treatment of dyed wastewater are performed by physical and electrochemical methods. Decreasing TDS, Color and Organic pollution with attention to recycling are our approaches. Nanotechnology also has real commercial potential for the textile industry.
Characterization and Treatment of Textile Effluent By Photocatalytic Method
2018
Textile industry is one of the important industries in the world that provide large employment with less required special skills and play a major role in the economy of many countries. The textile industry uses various chemicals and large amount of water during the production process. The waste water produced from this textile industries contains large amount of dyes, which are capable of harming the environment and human health. oxidation of organic and inorganic pollutantsby photochemical method is rapidly becoming an attractive technique for purify the water and wastewater treatment. A photo reactor setup consist of UV lamp and compressor. We take 250 ml of raw sample has to been treated and then add various dosage of Tio2. This sample is treated for 2 hours under UV lamp in the photo reactor. The results indicate that the photocatalytic decolouration process can efficiently treat textile effluent and reduce the levels of COD, Calcium Hardness, pH, Turbidity, Alkalinity, Total so...
Separation and Purification Technology, 2017
This study reports an integrated treatment strategy for synthetic polyester-cotton dyeing wastewater, combining biological and photochemical oxidation processes. The biodegradability of all constituents, dyes and dyeing auxiliary products, present in the synthetic polyester dyeing textile wastewater were firstly analysed through a Zahn-Wellens test. More than 80% of the constituents are easily biodegradable, being possible to achieve its complete removal by biological oxidation. Consequently, the synthetic wastewater was firstly subject to a biological oxidation, achieving a dissolved organic carbon (DOC) removal of 76%, resulting in a bio-treated wastewater with 84 mg L À1 of DOC. The colour reduction was less than 5% Platinum-Cobalt Scale (Pt-Co scale), 9% (DFZ 436nm), 3% (DFZ 525nm) and 0% (DFZ 620nm), (DFZ-DurchsichtFarbZahl, visual colour number in German). Thus, UVC/H 2 O 2 and photo-Fenton (PF) oxidation processes were used as a polishing step for the decolourisation of bio-treated textile wastewater. The PF reaction did not promote wastewater decolourisation as shown by the colour indicators monitored. Moreover, the addition of oxalic acid did not result in an enhancement of the PF reaction. On the other hand, the photolysis of hydrogen peroxide using UVC radiation showed decolourisation efficiencies of 71% (Pt-Co method), 86% (DFZ 436nm) and 97% (DFZ 525nm) and more than 40% of mineralisation, consuming 14.1 mM H 2 O 2 and 3.1 kJ UVC L À1 of energy dosage (time = 95 min; 6 W UVC lamp; natural pH = 8.4; T = 30°C). The effect of hydrogen peroxide dosage, lamp power, solution pH and temperature on the UVC/H 2 O 2 efficiency for wastewater decolourization was evaluated. During the photochemical reaction some low-molecular-weight carboxylic acids were detected, as oxalic acid, maleic acid and tartaric acid. The integrated treatment strategy was able to achieve a wastewater quality in agreement with the discharge limits imposed by legislation, and the total operating costs was 2.33 € m À3 .