A critical review on textile wastewater treatments: Possible approaches.

Microbial decolouration of azo dyes: a review.

An overview on the photocatalytic degradation of azo dyes in the presence of TiO2 doped with selective transition metals

Azo dyes represent the largest class of industrial colorants. These are no longer used only for the coloration of textiles, plastics, paints, inks, and lacquers, but rather serve as key components in high-tech applications such as optical data storage, reprographics, display devices, dye-sensitized solar cells, energy transfer cascades, light-emitting diodes, laser welding processes, or heat management systems. Azo dyes are also of growing importance in the medical and biomedical fields. In most of these applications, the color is largely irrelevant and it is the ability of the colorants to absorb visible electromagnetic radiation with high efficiency, or other functional property, that is exploited. With the growing awareness and environmental concerns, it is imperative that the hierarchy of reduce, reuse, and degrade be adopted and measures be taken to remove color from the industrial discharge. The present review (a) embodies a comparison of the present decolorization/degradation techniques for water-s...

Removal of Synthetic Textile Dyes From Wastewaters: A Critical Review on Present Treatment Technologies

The photocatalytic degradation of rhodamine B (RhB) over NaBiO3 under visible light irradiation was investigated in this study. RhB (20 mg/L) was almost completely decolorized in 30 min in given co...

Visible light-driven photocatalytic degradation of rhodamine B over NaBiO3: pathways and mechanism.

Decolorization and degradation of azo dye Methyl Red by an isolated Sphingomonas paucimobilis: Biotoxicity and metabolites characterization

Triphenylmethane dyes belong to the most important group of synthetic colorants and are used extensively in the textile industries for dying cotton, wool, silk, nylon, etc. They are generally considered as the xenobiotic compounds, which are very recalcitrant to biodegradation. Sphingomonas paucimobilis, was isolated from the soil sample collected from contaminated sites of textile industry located in KsarHellal, Tunisia, and it was able to decolorize Malachite Green (MG) dye (50 mg/l) within 4 h under shaking condition (pH 9 and temperature 25°C). The effect of inoculum size, dye concentration, temperature and initial pH of the solution were studied. The results obtained from the batch experiments revealed the ability of the tested bacteria to remove dye. UV-Vis spectroscopy and FTIR analysis of samples before and after decolorization confirmed the ability of the tested strain to decolorize MG. In addition, the phytotoxicity study revealed the degradation of MG into non-toxic product by S. paucimobilis.

Biodegradation of triphenylmethane dye Malachite Green by Sphingomonas paucimobilis

Response surface methodology for decolorization of azo dye Methyl Orange by bacterial consortium: Produced enzymes and metabolites characterization

Biodegradation and decolorization of triphenylmethane dyes by Staphylococcus epidermidis.

Synthetic dyes are widely used in the textile, cosmetic, printing, drug, and food processing industries. Triphenylmethane dyes belong to the most important group of synthetic dyes. They are generally considered as the xenobiotic compounds, which are very recalcitrant to biodegradation.Bacillus sp., was isolated from the treatment plant effluent of a textile and dyeing industry (SITEX) located in Ksar Hellal, Tunisia, decolorizes crystal violet (500 ppm) within 2.5 h under shaking condition at pH 7 and temperature 30 °C. The effect of dye concentration, temperature and initial pH of the solution were studied. The results obtained from the batch experiments revealed the ability of bacteria in removing dye. UV-Vis spectroscopy and FTIR analysis of samples before and after dye decolorization in culture medium confirmed decolorization of crystal violet. The phytotoxicity and microbial toxicity studies of extracted metabolites suggest the less toxic nature of them.

Abdelkarim Cheref

Papers

Decolorization and degradation of azo dye Methyl Red by an isolated Sphingomonas paucimobilis: Biotoxicity and metabolites characterization

Biodegradation of triphenylmethane dye Malachite Green by Sphingomonas paucimobilis

Response surface methodology for decolorization of azo dye Methyl Orange by bacterial consortium: Produced enzymes and metabolites characterization

Biodegradation and decolorization of triphenylmethane dyes by Staphylococcus epidermidis.

Biodegradation of crystal violet by an isolatedBacillus sp.