scholarly journals Decolorization of textile azo dye Reactive Red 239 by the novel strain Shewanella xiamenensis G5-03 isolated from contaminated soil

2019 ◽  
Vol 14 (6) ◽  
pp. 1
Author(s):  
Aline Silva Cossolin ◽  
Hélen Cristina Oliveira dos Reis ◽  
Ketinny Camargo de Castro ◽  
Bruna Assis Paim dos Santos ◽  
Matheus Zimermann Marques ◽  
...  
Keyword(s):  
Azo Dyes ◽  
Wide Temperature Range ◽  
Contaminated Soil ◽  
Azo Dye ◽  
Potential Candidate ◽  
The Novel ◽  
Wide Range ◽  
Ph Range ◽  
Static Conditions ◽  
Kinetics Of

Shewanella xiamenensis G5-03 isolated from contaminated landfill soil efficiently decolorized five textile azo dyes under static conditions. One of them, Reactive Red 239 (RR239), was completely decolorized at a pH range of 7 to 11 (at 35°C) within 3-6 h. The bacterium was also efficiently decolorized RR239 in a wide temperature range of 25-40°C (at pH 8). The kinetics of RR239 decolorization by G5-03 fitted to the Michaelis–Menten Model (Km = 443.3 mg L-1, Vmax = 166.7 mg L-1 h-1). The decolorization of RR239 was monitored by UV-Vis and FTIR spectroscopy, which showed significant changes in peak positions when compared to the dye spectrum. Overall, the ability of S. xiamenensis G5-03 to decolorize textile azo dyes in a wide range of temperatures and pH (neutral-alkaline) indicate that this strain is a potential candidate for treating dye-containing effluent.

Role of Enzymes From Microbes in the Treatment of Recalcitrant From Industries

2018 ◽  
pp. 395-420
Author(s):  
Veena Gayathri Krishnaswamy
Keyword(s):  
Fresh Water ◽  
Azo Dyes ◽  
Azo Dye ◽  
Dye Degradation ◽  
Anthropogenic Activities ◽  
Bacterial Degradation ◽  
Wide Range ◽  
Pharmaceutical Industries ◽  
Degradation Of Azo Dye

The limited availability of fresh water is a global crisis. The growing consumption of fresh water due to anthropogenic activities has taken its toll on available water resources. Unfortunately, water bodies are still used as sinks for waste water from domestic and industrial sources. Azo dyes account for the majority of all dye stuffs, produced because they are extensively used in the textile, paper, food, leather, cosmetics, and pharmaceutical industries. Bacterial degradation of azo dyes under certain environmental conditions has gained momentum as a method of treatment, as these are inexpensive, eco-friendly, and can be applied to wide range of such complex dyes. The enzymatic approach has attracted much interest with regard to degradation of azo dyes from wastewater. The oxido-reductive enzymes are responsible for generating highly reactive free radicals that undergo complex series of spontaneous cleavage reactions, due to the susceptibility of enzymes to inactivation in the presence of the other chemicals. The oxidoreductive enzymes, such as lignin peroxidase, laccases, tyrosinase, azoreductase, riboflavin reductive, polyphenol oxidase, and aminopyrine n-demethylase, have been mainly utilized in the bacterial degradation of azo dye. Along with the reductive enzymes, some investigators have demonstrated the involvement in some other enzymes, such as Lignin peroxides and other enzymes. This chapter reviews the importance of enzymes in dye degradation.

scholarly journals Enhancement on the Microbial Extracellular Electron Transfers by Modified Lignin Materials: Application on Decolorization of Azo Dye

2021 ◽  
Author(s):  
Rong-ping Chen ◽  
Jia-li Cai ◽  
Qing Li ◽  
Xin-yuan Wei ◽  
Cheng-hao Gan ◽  
...  
Keyword(s):  
Azo Dyes ◽  
Azo Dye ◽  
Anaerobic Respiration ◽  
Electrochemical Performances ◽  
Oh Radicals ◽  
The Novel ◽  
Remarkable Effect ◽  
Decolorization Efficiency ◽  
Modified Lignin ◽  
Electron Transfers

Abstract Background: Extracellular electron transfers (EETs) are mainly involved in anaerobic respiration of quinone-respiring strains, which is applicable in many fields, such as microbiological fuel cell, bio-hydrogen production, anoxic denitrification, and bio-reduction of azo dyes. However, this kind of instinctive function of microbes was nonspecific and low efficient, which needed to be improved by addition of exogenous redox mediators (RMs). In this work, vanillin, syringaldehyde and p-hydroxybenzaldehyde, as the precursors of lignin, were functionally modified to RMs in effort to accelerate the bio-reduction azo dyes.Results: The results showed that the decolorization efficiency of MO motivated by modified vanillin were increased from 20% to 95% in less than 12 h. And the modified syringaldehyde was increased to 85% in 24h. According to GC-MS, the modified products of vanillin and syringaldehyde were mainly kinds of phenols, ketones and quinones. The RMs exhibited better electrochemical performances by CV measurement and the •OH radicals were found according to EPR. Under saline condition, the strain, in the presence of RMs, still exhibited a high and stable removal efficiency to MO.Conclusions: The novel RMs of biodegradation to azo dyes were prepared from lignin monomers. The RMs based on bio-materials are environment-friendly and have a remarkable effect in biodegradation of azo dyes. This work may provide a new route for the functional utilization of lignin-resource and a theoretical guidance for efficient biodegradation of azo dye wastewater.

Ozonation of azo dyes

1997 ◽  
Vol 35 (4) ◽  
pp. 279-286 ◽  
Author(s):  
S. Liakou ◽  
S. Pavlou ◽  
G. Lyberatos
Keyword(s):  
Mathematical Model ◽  
Azo Dyes ◽  
Azo Dye ◽  
Orange Ii ◽  
Batch Experiments ◽  
Ozone Oxidation ◽  
Ozone Pretreatment ◽  
Kinetics Of ◽  
Dye Molecule

Ozone pretreatment studies of wastewater containing a specific azo dye – Orange II - were conducted in order to assess the kinetics of ozone oxidation and to evaluate the effect of ozonation on the biodegradability of the wastewater. Batch experiments were performed at different initial concentrations of the dye, showing that ozone is capable of a rapid disruption of the dye molecule. Moreover, the production of biodegradable compounds is apparent from the evolution of COD and BOD5 measurements. A mathematical model which describes the dye elimination, the COD and BOD5 variation, and the amount of ozone reacted has been developed.

Decolorization of Azo Dyes by a New Strain CD-2 Isolated from the Textile Dye Contaminated Water

2011 ◽  
Vol 183-185 ◽  
pp. 381-386 ◽  
Author(s):  
Dai Zong Cui ◽  
Min Zhao ◽  
Guo Fang Li ◽  
Xiao Xu Gu ◽  
Guang Ying Hui Du ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Azo Dyes ◽  
Azo Dye ◽  
Dye Removal ◽  
Contaminated Water ◽  
Textile Dye ◽  
Methyl Red ◽  
E Coli ◽  
Eriochrome Black T ◽  
Ph Range

In this study, a new strain was isolated by us based on its efficiency to decolorize azo dyes. Identification of this isolate by 16S rDNA technique revealed that the strain belonged to Escherichia, and clustered within Escherichia coli. According to this, we renamed our strain as E. coli CD-2. The strain CD-2 could decolorize azo dyes effectively under aerobic conditions. CD-2 exhibited good decolorization ability in the pH range from 3 to 11, temperature from 30°C to 42°C and salinity from 1% to 4%. CD-2 could decolorized different azo dyes (methyl red, Congo red, eriochrome black T and eriochrome red B) within 16h, and the decolorizing rate were 97.15%, 86.03%, 56.92% and 81.14%, respectively. This degradation potential increased the applicability of this strain for the azo dye removal.

scholarly journals Phylogenetically diverse bacteria isolated from tattoo inks, an azo dye-rich environment, decoloize a wide range of azo dyes

2021 ◽  
Author(s):  
Seong Won Nho ◽  
Xue Wen Cui ◽  
Ohgew Kweon ◽  
Jinshan Jin ◽  
Huizhong Chen ◽  
...  
Keyword(s):  
High Throughput ◽  
Azo Dyes ◽  
Azo Dye ◽  
Dye Degradation ◽  
Methyl Red ◽  
Diverse Range ◽  
Optical Absorbance ◽  
Wide Range ◽  
Systematic Understanding ◽  
Tattoo Inks

Abstract Purpose: There has been an interest in the microbial azo dye degradation as an optional method for the treatment of azo dye-containing wastes. Tattoo ink is an extremely unique azo dye-rich environment, which never been explored in terms of microorganisms capable of degrading azo dyes. Previously, we isolated 81 phylogenetically diverse bacteria, belonging to 20 genera and 49 species, contaminated in tattoo inks. In this study, we investigated if these bacteria, which can survive in the azo dye-rich environment, have an ability to degrade azo dyes. Methods: We conducted a two-step azo dye degradation (or decolorization) assay. In step 1, a high-throughput degradability assay was done for 81 bacterial isolates using Methyl Red and Oragne II. In step 2, a further degradation assay was done for 10 selected bacteria with a representative of 11 azo dyes, including 3 commercial tattoo ink azo dyes. Degradation of azo dyes were calculated from measuring optical absorbance of souble dyes at specific wavelenths. Results: The initial high-throughput azo dye assay (step 1) showed that 79 isolates had a complete or partial degradation of azo dyes; >90% of Methyl Red and Orange II were degraded within 24 h, by 74 and 20 isolates, respectively. A further evaluation of azo dye degradability for 10 selected isolates in step 2 showed that the isolates, belonging to Bacillus , Brevibacillus , Paenibacillus , and Pseudomonas , exhibited an excellent decolorization ability for a wide range of azo dyes. Conclusions: This study showed that phylogenetically diverse bacteria, isolated from azo dye-rich tattoo inks, is able to degrade a diverse range of azo dyes, including 3 azo dyes used in commercial tattoo inks. Some of the strains would be good candidates for future studies to provide a systematic understanding of azo dye degradation mechanisms

Use of Electrothermal Explosion and Electro-Thermal Analyser (ETA-100) for the Study the Kinetics of Fast High-Temperature Reactions in SHS-Ceramic Systems

2010 ◽  
Vol 63 ◽  
pp. 203-212
Author(s):  
A.S. Shteinberg ◽  
A.A. Berlin
Keyword(s):  
High Temperature ◽  
Rate Constants ◽  
High Speed ◽  
Dissimilar Materials ◽  
Isothermal Kinetics ◽  
Hard Alloys ◽  
Wide Range ◽  
Static Conditions ◽  
The Impact ◽  
Kinetics Of

Due to the lack of specialty kinetic methods and instruments, the kinetics of fast hightemperature reactions SHS-ceramic systems has not been adequately studied. Recently, we have developed a number of methods of so-called non-isothermal kinetics (NIK) and designed instruments allowing one to obtain information about reactions of ceramic systems in a wide range of practically important temperatures and rates. The use of one of the NIK-methods (called electrothermal analysis based on the phenomena of electro thermal explosion) allows one to study kinetics of SHS of some ceramic materials characterized by the total reaction time ~ 10 μs. In ETE, both samples pressed from reagents powders or cylindrical samples made from tightly rolled foils were studied. The joule heating was accompanied by high-speed scanning of the non-stationary temperature field on its surface. Description and technical characteristics of the specialty device electrothermoanalyzer ETA-100 manufactured by ALOFT are given. Kinetic parameters of fast EM reactions for the temperatures up to 3600 K can be measured by ETE method using ETA-100. New kinetic data for fast high-temperature gasless SHS yielding individual and composite materials (including refractory carbides and borides of transition metals, silicon and boron carbides, some refractory oxides and hard alloys) are presented. At high-speed impact of the samples, the reaction rate constants were found to exceed the combustion rate constants (measured by ETA-100) by many orders of magnitude. It was concluded that the kinetic mechanisms of the corresponding fast reactions in the static conditions and under the impact are dramatically different. It was shown that SHS in ETE mode has a significant potential as a modern practical method to be used for welding of refractory and dissimilar materials, production of coarse superabrasives, etc.

THE CHEMISTRY OF ETHYLENE OXIDE: II. THE KINETICS OF THE REACTION OF ETHYLENE OXIDE WITH AMINES IN AQUEOUS SOLUTION

1951 ◽  
Vol 29 (7) ◽  
pp. 575-584 ◽  
Author(s):  
A. M. Eastham ◽  
B. deB. Darwent ◽  
P. E. Beaubien
Keyword(s):  
Aqueous Solution ◽  
Ethylene Oxide ◽  
Order Equation ◽  
Basic Catalysis ◽  
Ion Concentrations ◽  
Hydroxyl Ion ◽  
Wide Range ◽  
Dilute Aqueous Solution ◽  
Ph Range ◽  
Kinetics Of

The kinetics of the reaction of ethylene oxide in dilute aqueous solution at 25°C. with di- and tri-ethylamines, aniline, and pyridine have been investigated over a wide range of hydrogen and hydroxyl ion concentrations. The rates for all four amines were found to be very similar and were accurately expressed by the simple second order equation −d oxide/dl = k(oxide)(amine). The results indicate that basic catalysis does not occur and that catalysis by hydrogen or ammonium-type ions, if it occurs at all, is of no significance in the pH range 4–14.

Pretreatment of azo dyes using ozone

1997 ◽  
Vol 36 (2-3) ◽  
pp. 155-163 ◽  
Author(s):  
S. Liakou ◽  
M. Kornaros ◽  
G. Lyberatos
Keyword(s):  
Mathematical Model ◽  
Azo Dyes ◽  
Textile Industry ◽  
Azo Dye ◽  
Biological Treatment ◽  
Organic Dyes ◽  
Industrial Processes ◽  
Orange Ii ◽  
Batch Experiments ◽  
Kinetics Of

Wastewaters produced in textile industrial processes contain organic dyes which are not easily amenable to biological treatment. Pretreatment with ozone is a promising method for oxidation of those dyes to more degradable compounds. The aim of this work is to assess the oxidation kinetics of a specific azo dye used in the textile industry, Orange II. Batch experiments were conducted in order to elucidate the oxidation route of the dye. Oxalate, formate and benzenesulfonate are found to be the oxidation intermediate compounds. A mathematical model which describes the dye elimination, the COD and BOD5 variation, the amount of ozone reacted and the time evolution of the intermediate compounds has been developed.

Role of Enzymes From Microbes in the Treatment of Recalcitrant From Industries

2021 ◽  
pp. 878-903
Author(s):  
Veena Gayathri Krishnaswamy
Keyword(s):  
Fresh Water ◽  
Azo Dyes ◽  
Azo Dye ◽  
Dye Degradation ◽  
Anthropogenic Activities ◽  
Bacterial Degradation ◽  
Wide Range ◽  
Pharmaceutical Industries ◽  
Degradation Of Azo Dye

The limited availability of fresh water is a global crisis. The growing consumption of fresh water due to anthropogenic activities has taken its toll on available water resources. Unfortunately, water bodies are still used as sinks for waste water from domestic and industrial sources. Azo dyes account for the majority of all dye stuffs, produced because they are extensively used in the textile, paper, food, leather, cosmetics, and pharmaceutical industries. Bacterial degradation of azo dyes under certain environmental conditions has gained momentum as a method of treatment, as these are inexpensive, eco-friendly, and can be applied to wide range of such complex dyes. The enzymatic approach has attracted much interest with regard to degradation of azo dyes from wastewater. The oxido-reductive enzymes are responsible for generating highly reactive free radicals that undergo complex series of spontaneous cleavage reactions, due to the susceptibility of enzymes to inactivation in the presence of the other chemicals. The oxidoreductive enzymes, such as lignin peroxidase, laccases, tyrosinase, azoreductase, riboflavin reductive, polyphenol oxidase, and aminopyrine n-demethylase, have been mainly utilized in the bacterial degradation of azo dye. Along with the reductive enzymes, some investigators have demonstrated the involvement in some other enzymes, such as Lignin peroxides and other enzymes. This chapter reviews the importance of enzymes in dye degradation.

Influence of pH on the Kinetics of Reactions Catalyzed by Alkaline Phosphatase

1973 ◽  
Vol 51 (7) ◽  
pp. 1096-1103 ◽  
Author(s):  
Irwin Hinberg ◽  
Keith J. Laidler
Keyword(s):  
Alkaline Phosphatase ◽  
Intestinal Alkaline Phosphatase ◽  
Nitrophenyl Phosphate ◽  
Wide Range ◽  
Coordinated Water ◽  
Ph Range ◽  
Barbital Buffer ◽  
Influence Of Ph ◽  
Kinetics Of ◽  
Hydrolysis Of

An experimental study has been made of the kinetics of the hydrolysis of p-nitrophenyl phosphate catalyzed by chicken-intestinal alkaline phosphatase. The work was done in barbital buffer (carbonate above pH 9.6), and covered the pH range from 7.0 to 10.0. A sufficiently wide range of substrate concentration was used to allow reliable values of [Formula: see text] and [Formula: see text] to be determined. The results lead to pK values of 8.1 and 8.6 for the free enzyme, and it is concluded that the Michaelis complex and the phosphoryl intermediate ionize only on the acid side, the former also having a pK of 8.1. It is suggested that the group of pK 8.1 is probably an α-amino group and that the group of pK 8.6 probably corresponds to the ionization of a Zn(II)-coordinated water molecule.

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