Decolorization of reactive dyes with different molecular structures under different environmental conditions

Panswad, Thongchai; Luangdilok, Worrawit

doi:10.1016/s0043-1354(00)00200-1

Cited by 180 publications

(90 citation statements)

References 9 publications

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“…Decolorization rate of DO-16 was found to decrease substantially at 40°C and 45°C exhibiting 46 and 29 % rate. This inhibition is most likely due to deactivation of enzymes responsible for decolorization or loss of cell viability (Panswad and Luangdilok 2000;Cetin and Donmez 2006). Similar effect of temperature was seen in Bacillus sp.…”

Section: Effect Of Physicochemical Parameters On Do-16 Decolorizationmentioning

confidence: 52%

Biodegradation of azo dye Direct Orange 16 by Micrococcus luteus strain SSN2

Singh

Chatterji

Nandini

et al. 2014

Int. J. Environ. Sci. Technol.

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In the present study, the decolorization and degradation of azo dye Direct Orange 16 (DO-16) by a potential bacterial isolate isolated from textile effluent were evaluated. Through 16S rRNA sequence matching, the potential isolate was identified as Micrococcus luteus strain SSN2. The effects of various factors (pH, temperature, salt and dye concentration) on decolorization were investigated. The strain SSN2 had the ability to decolorize DO-16 with 96 % efficiency at pH 8, 37°C and 3 % NaCl in a short time of 6 h under static conditions. DO-16 decolorization was assessed by UV-Vis spectrophotometer with gradual decrease of dye peak intensity at 430 nm (k max ). Analytical techniques (thin-layer chromatography, Fourier transform infrared spectroscopy and high-performance liquid chromatography) further confirmed that biodegradation of DO-16 was due to reduction of the azo bond. The phytotoxicity assay (with respect to seeds of Vigna mungo and Vigna radiata) demonstrated the less toxic nature of the DO-16-degraded products compared to the toxic azo dye.

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Section: Effect Of Physicochemical Parameters On Do-16 Decolorizationmentioning

confidence: 52%

Biodegradation of azo dye Direct Orange 16 by Micrococcus luteus strain SSN2

Singh

Chatterji

Nandini

et al. 2014

Int. J. Environ. Sci. Technol.

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“…Azo dyes are electron-deficient molecules which can undergo degradation via azo reduction. Rate of decolourization is affected by molecular weight, substitution groups of the dye molecules, number of azo bonds, and intermolecular hydrogen bonds between the azo and hydroxyl groups (Johnstrup et al 2011;Lourenco et al 2001;Panswad and Luangdilok 2000). Azo compounds with a hydroxyl or amino groups are more likely to be degraded than those with methyl, methoxy, sulpho, or nitro groups (Supaka et al 2004).…”

Section: Dye Structurementioning

confidence: 99%

Destruction of azo dyes by anaerobic–aerobic sequential biological treatment: a review

Popli

Patel

2014

Int. J. Environ. Sci. Technol.

270

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Dyes are synthetic organic compounds widely used in various industries such as, textile, leather, plastic, food, pharmaceutical, and paints manufacturing industries. Coloured effluents are highly toxic to the aquatic life and mutagenic to humans. Wastewater containing dyes has become an important issue demanding serious attention. Among the synthetic dyes, azo dyes are the largest and most widely used dyes and account for more than half of the annually produced dyes. The biodegradation of azo dyes is difficult due to their complex structure and synthetic nature. Several treatments have been proposed for efficient azo dye removal, most of them presenting some limitations such as generation of waste sludge, high operational costs, poor efficiency, and incomplete mineralization. Biological treatment is a cost-effective and eco-friendly process for dye degradation. Sequential anaerobic-aerobic biological treatment is considered as one of the most cost-effective methods for the complete mineralization of azo dyes. The anaerobic stage yields decolourization through reductive cleavage of the dye's azo linkages, resulting in the formation of generally colourless but potentially hazardous aromatic amines. The aerobic stage involves degradation of the aromatic amines. It is the most logical step for removing the azo dyes from the wastewater. Several factors can influence the microbial activity and consequently the efficacy and effectiveness of the complete biodegradation processes. This paper summarizes the results of biological decolourization of azo dyes using various types of reactors, elaborates biochemical mechanisms involved, and discusses influence of various operational parameters on decolourization based on reports published in the last decade.

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“…Fig. 2 shows that the complete dye decolorization increased with increase in temperature from 20-40°C and decreases with increase in temperature above the 40°C,which might be due to the loss of cell viability or deactivation of the enzymes responsible for decolorization [10,11]. The 100% dye decolorization was observed at 40°C within 20 h and temperature between 35-45°C was optimum for the removal of Magenta.…”

Section: Resultsmentioning

confidence: 96%

Optimization of Magenta Dye Decolorization Different Parameters by Citrobacter sp.

2017

IJSR

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A thermo-alkalophilic bacterium Citrobacter sp. isolated from textile mill effluent sample as a decolouring microorganism.The maximum 500 mg L -1 Magenta (Basic Red-9) dye decolorization was takes place in 48 h and completely decolorizes the dye Magenta up to a maximum concentration 1000 ppm, however the time taken was 104 h. The optimum physical parameters such as temperature 40°C, pH 8.0 and 2.5% (w/v) of nitrogen source were required for the decolorization of Magenta dye by Citrobacter sp.Effect of seven different metal ions on decolorization of Magenta tested, in which most toxic was Cadmium and less toxic was Lead at 0.05 mM concentration. The curing study indicates that decolorization was takes place by enzyme which was plasmid mediated. The degraded dye metabolites are analyzed by TLC and diazotization, carbylamines test for individual metabolite indicates biotransformation of Magenta into aromatic amine and non-toxic aromatic metabolites. These results suggest that the isolated organism Citrobacter sp.as a useful tool to treat waste water containing reactive dyes at static condition.

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Decolorization of reactive dyes with different molecular structures under different environmental conditions

Cited by 180 publications

References 9 publications

Biodegradation of azo dye Direct Orange 16 by Micrococcus luteus strain SSN2

Biodegradation of azo dye Direct Orange 16 by Micrococcus luteus strain SSN2

Destruction of azo dyes by anaerobic–aerobic sequential biological treatment: a review

Optimization of Magenta Dye Decolorization Different Parameters by Citrobacter sp.

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