scholarly journals Decolourization of synthetic dyes by laccase enzyme produced by Kluyveromyces dobzhanskii DW1 and Pichia manshurica DW2

2019 ◽  
Vol 18 (1) ◽  
pp. 1-11 ◽  
Author(s):  
Monilola Wakil Sherifah ◽  
Andrew Eyiolawi Seun ◽  
Olamide Salawu Kehinde ◽  
Anthony Onilude Abiodun
Keyword(s):  
Synthetic Dyes ◽  
Pichia Manshurica ◽  
Laccase Enzyme

Laccase-catalyzed enzymatic dyeing of cotton fabrics

2021 ◽  
pp. 004051752110069
Author(s):  
Rıza Atav ◽  
Bürhan Buğdaycı ◽  
Ömer Bozkurt ◽  
Aylin Yıldız ◽  
Elçin Güneş ◽  
...  
Keyword(s):  
Experimental Studies ◽  
Uv Protection ◽  
Infrared Analysis ◽  
Synthetic Dyes ◽  
Protection Factor ◽  
Knitted Fabrics ◽  
Reactive Dyeing ◽  
Dyeing Process ◽  
Laccase Enzyme ◽  
Color Reproducibility

As some synthetic dyes are regarded to be toxic, mutagenic and carcinogenic, the search for eco-friendly alternatives for the synthesis of dyes and coloration has gained importance. For this reason, this study focused on finding new eco-friendly alternatives for coloring cotton. 100% cotton knitted fabrics were subjected to enzymatic coloration using a commercial laccase enzyme and various precursors. After determining the colors, the effect of pH on the enzymatic dyeing process was investigated. Then the optimization of reaction conditions was also realized statistically for the precursors giving the best results in terms of color. With the aim of obtaining further improvements in color-yield values obtained in enzymatic dyeings, the effect of the pretreatment process and the use of ultrasound were also investigated. Furthermore, the reaction pathways in enzymatic coloration were explained and results were confirmed by means of Fourier Transformed Infrared analysis. As a result of experimental studies, red and lilac colors could be successfully obtained on cotton for the first time in the literature. In this way, the theoretical basis of enzymatic dye synthesis and dyeing of cotton was clarified comprehensively. Furthermore, technical (color reproducibility; washing, rubbing, light and perspiration-fastness values; and UV protection factor), economical (chemical, energy and water consumption required for dyeing (including aftertreatments) of 1 kg fabric) and ecological aspects of enzymatic dyeings were compared with reactive dyeing. According to the experimental results it was found that biological treatment alone was enough for wastewater of enzymatic coloring, while chemical treatment will also be needed in reactive dyeing wastewater. Furthermore, color reproducibility, evenness and UV protection properties of dyed samples were comparable with that of reactive dyeings. However, in terms of the fastness levels achieved, the enzymatic coloring was far behind the reactive dyeing.

scholarly journals Biostoning of textile effluent with laccase enzyme

2021 ◽  
Vol 56 (2) ◽  
pp. 115-124
Author(s):  
K Iqbal ◽  
A Nadeem ◽  
U Zafar
Keyword(s):  
Synthetic Medium ◽  
Dye Decolorization ◽  
White Rot ◽  
Textile Effluent ◽  
White Rot Fungus ◽  
Synthetic Dyes ◽  
Aquatic Life ◽  
Predicted Values ◽  
Laccase Enzyme ◽  
Experimental Values

The incessant release of textile effluent comprehending dyes and heavy metals which impacts on aquatic life. Current study used an enzyme to eradicate phenolic compounds and synthetic dyes from textile effluent by an indigenously isolated white rot fungus Pleurotus ostreatus- P1 has been cultured and indicated the utmost laccase activity with synthetic medium; as reacting substrate for dye decolorization. The textile effluent decolorization optimization has been conducted with different concentrations of laccase enzyme, temperature and pH. The 90% effluent decolorization was obtained by applying response surface methodology (RSM) conditions temperature, crude laccase enzyme and pH, 25˚C, 13.5 U/ml and 5 respectively. The predicted values were validated with experimental values, that confirms the steadiness of the model. Bangladesh J. Sci. Ind. Res.56(2), 115-124, 2021

Decolorization of synthetic dyes by white rot fungi, involving laccase enzyme in the process

2007 ◽  
Vol 42 (10) ◽  
pp. 1429-1435 ◽  
Author(s):  
Emrah A. Erkurt ◽  
Ali Ünyayar ◽  
Halil Kumbur
Keyword(s):  
White Rot Fungi ◽  
White Rot ◽  
Synthetic Dyes ◽  
Laccase Enzyme

Couleurs à la mode. Impressionism as an Effect of the Chemical Industry

2015 ◽  
Vol 6 (1) ◽  
pp. 159-184
Author(s):  
Wolf Kittler
Keyword(s):  
Nineteenth Century ◽  
Direct Effect ◽  
Chemical Industry ◽  
Synthetic Dyes ◽  
Modern City ◽  
Fashion Magazines ◽  
Realist Novels

"Die Erfindung von Anilin und anderen synthetischen Farbstoffen in der zweiten Hälfte des neunzehnten Jahrhunderts ist der Beginn einer neuen Epoche. Die von der noch jungen chemischen Industrie produzierten neuen Farben sind nicht nur leuchtender als die meisten der traditionellen Farbstoffe, sondern auch viel billiger. Sie verändern das Aussehen von Frauen auf den Straßen der modernen Stadt. Unter den ersten Medien, die diese Revolution bemerken und dokumentieren, sind Modezeitschriften, realistische Romane und impressionistische Gemälde. Der Beitrag zeigt, dass die strahlenden Farben der neuen Palette der impressionistischen Maler ein direkter Effekt der chemischen Industrie sind. </br></br>The invention of aniline and other synthetic dyes in the second half of the nineteenth century is the beginning of a new epoch. The new colors produced by the fledgling chemical industry are not only brighter than most of the traditional dyestuffs, but also much cheaper. They change the appearance of women on the streets of the modern city. Among the first media to notice and document this revolution are fashion magazines, realist novels, and Impressionist paintings. I argue that the bright colors on the new palette of Impressionist painters are a direct effect of the chemical industry. "

Green Synthesis of ZnO/Dy/NiO Heterostructures for Enhanced Photocatalytic Applications

2020 ◽  
Vol 1 (1) ◽  
pp. 30-36
Author(s):  
Shubha Jayachamarajapura Pranesh ◽  
Diwya Lanka
Keyword(s):  
Visible Light ◽  
Uv Light ◽  
Combustion Method ◽  
Hybrid Nanocomposites ◽  
Synthetic Dyes ◽  
Hybrid Nanostructure ◽  
Wide Range ◽  
Visible Light Active ◽  
Textile Industries ◽  
Photocatalytic Applications

Background: Textile industries discharge harmful synthetic dyes to nearby water sources. These colour effluents should be treated before discharge to reduce the toxicity caused by synthetic colours. Objective: To synthesize visible light active superstructures to reduce water pollution caused by textile industries. Methods: We have successfully synthesized ZnO/Dy/NiO hybrid nanocomposites using waste curd as fuel by a simple combustion method. The obtained material was able to reduce recombination and enhanced the photocatalytic degradation of organic pollutants. The as-synthesized material was characterized by XRD, absorption spectroscopy, FESEM, EDAX, etc. The obtained hybrid nanostructure was used as a photocatalyst for the degradation of methylene blue under sunlight, UV light as well as in dark. Comparative experiments were carried out with a variation of catalytic load, pH, dye concentrations, etc. for a better understanding of the performance of the catalyst at various conditions. Results and Conclusion: The ternary compound shows wide range of absorption by expanding absorption band both in UV and visible regions. ZnO/Dy/NiO hybrid nanocomposites performed well and showed uniqueness in the activity uder visible light.

The Use of Ultrasound in Bio-Treatment of Jute Yarn with Laccase Enzyme

2019 ◽  
Vol 12 (4) ◽  
pp. 275-286
Author(s):  
Ali A. Zolriasatein
Keyword(s):  
Tensile Strength ◽  
Reaction Times ◽  
Complete Removal ◽  
Jute Fiber ◽  
Light Fastness ◽  
Color Strength ◽  
Yellowness Index ◽  
Laccase Enzyme ◽  
Enzymatic Delignification ◽  
Jute Yarn

Background and Objective: Jute fiber is highly sensitive to the action of light. Significant features of the photochemical changes lose its tensile strength and develop a yellow color. It has been proved that the phenolic structure of lignin is responsible for the yellowing of jute fiber. In order to remove lignin, jute yarns were treated with laccase enzyme in different treatment times and ultrasonic powers. Lower whiteness index and higher yellowness index values were obtained by the laccase-ultrasound system in contrast to conventional laccase treatment. Methods: The laccase enzyme which entered the fibers by applying ultrasound, decreased the tensile strength while the loss in tensile strength was lower at high ultrasound intensities. FT-IR spectrum showed that the band at 1634 cm-1 assigned to lignin completely disappeared after laccase treatment in the presence of ultrasound. The absence of this peak in the laccase-ultrasound treated jute yarn suggests complete removal of lignin. Change in the morphology of fibers was observed by SEM before and after enzymatic delignification. The laccase-ultrasound treated yarns showed a rougher surface and more porosity. On the other hand, it was more effective in fibrillation of the jute fibers than the conventional method. Finally, bio-treated jute yarns were dyed with basic and reactive dyes. Results: The results indicated that at low intensities of ultrasound and relatively long reaction times, lignin can be more effectively removed and dye strength (K/S) increased to a higher extent. Laccase-ultrasound treatment increased the color strength by 33.65% and 23.40% for reactive and basic dyes respectively. Conclusion: In the case of light fastness, the conventional laccase treated yarns provided better protection than laccase-ultrasound treated yarns.

scholarly journals The Sustainable Production of a Novel Laccase from Wheat Bran by Bordetella sp. JWO16: Toward a Total Environment

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 677
Author(s):  
John Onolame Unuofin
Keyword(s):  
Wheat Bran ◽  
Contaminated Soils ◽  
Residual Activity ◽  
Dye Decolorization ◽  
Fermentation Medium ◽  
Biochemical Properties ◽  
Synthetic Dyes ◽  
High Concentrations ◽  
Capital Intensive ◽  
Agroindustrial Residue

Laccase is increasingly adopted in diverse industrial and environmental applications, due to its readily accessible requirements for efficient catalytic synthesis and biotransformation of chemicals. However, it is perceived that its industrial production might incur some unfavorable overhead, which leads to expensive market products, and the corresponding negative environmental feedback, due to the use of capital-intensive and precarious chemicals. To this end, this study was designed to evaluate the performance indicators of the valorization of wheat bran by a novel Jb1b laccase and its subsequent application in waste minimization and water management, on a laboratory scale. Optimal Jb1b laccase was produced in submerged fermentation medium containing wheat bran, an agroindustrial residue, through response surface methodology (RSM) algorithm, and was applied in dye decolorization and denim bioscouring, respectively. Results showed that the resultant enzyme manifested unique biochemical properties, such as enhanced tolerance at certain physicochemical conditions, with a residual activity of at least ca. 76%. Furthermore, phenomenally high concentrations of synthetic dyes (0.2% w v−1) were decolorized over 56 h, and a 6 h mediator-supported simultaneous denim bleaching and decolorization of wash effluent was observed. The sustainability of the production and application processes were inferred from the reusability of the fermentation sludge as a potential biofertilizer, with subsequent prospects for the biostimulation and bioaugmentation of contaminated soils, whereas the decolorized water could be adopted for other uses, amongst which horticulture and forestry are typical examples. These phenomena therefore authenticate the favorable environmental feedbacks and overhead realized in this present study.

Terephthalaldehyde as better crosslinking agent in crosslinked chitosan hydrogel for selective removal of anionic dyes

2021 ◽  
Author(s):  
Madhvi Garg ◽  
Navneet Bhullar ◽  
Bharat Bajaj ◽  
Dhiraj Sud
Keyword(s):  
Crosslinking Agent ◽  
Selective Removal ◽  
Synthetic Dyes ◽  
Anionic Dyes ◽  
Chitosan Hydrogel ◽  
Ultrasound Radiation ◽  
Radiation Induced ◽  
Crosslinked Chitosan ◽  
Chitosan Hydrogels ◽  
Crosslinking Agents

The present manuscript reports the ultrasound radiation induced synthesis of grafted chitosan hydrogels (CAAT and CAAG) using terephthalaldehyde/glutaraldehyde as crosslinking agents and its application for removal of synthetic dyes from...

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