Isolation, identification, and characterization of newly isolated yeast, Diutina rugosa capable of decolorizing indigo dye were investigated in this study. Molecular and phylogenetic analyses of 23S rRNA sequence data indicated that the yeast belonged to the new genus, Diutina . The optimization of physicochemical parameters such as pH of the solution (2–8), initial dye concentration (10–60 mg L −1 ), adsorbent mass (0.1–2 g), and temperature (10–50 °C) was studied to scale- up the conditions of dye removal. Furthermore, complete decolorization (99.97%) of indigo dye (10 mg L −1 ) was achieved at pH 2, temperature 30 °C and 2.0 g cell biomass within 5 days. Degradation was monitored through UV–vis spectrophotometric, FTIR, and GCMS analyses. The results of FTIR analysis obtained revealed the loss and shifts in spectra peaks of the experimental in comparison with the biological control. Possible degradation pathway was proposed using the intermediate metabolites; 1, 2-dihydro-3 H -indol-3-one and cyclopentanone obtained through GCMS analysis. The enzyme analyses revealed significant inductions and major roles played by NADH-DCIP reductase and lignin peroxidase in the asymmetric cleavage, initial reduction and deamination of indigo dye. The equilibrium experimental data were fitted to Langmuir, Freundlich and Temkin adsorption isotherms with high adjusted coefficient of determination values; adjR 2  = 0.907, adjR 2  = 0.867, and adjR 2  = 0.965 respectively. However, the Langmuir and Temkin adsorption isotherms affirmed the monolayer and heterogeneous biosorption characteristics of Diutina rugosa. Temkin adsorption isotherm model (R 2  = 0.971) represented the best fit of experimental data than other isotherm models.

Degradation of indigo dye by a newly isolated yeast, Diutina rugosa from dye wastewater polluted soil

Engineering conversion of Asteraceae plants into biochars for exploring potential applications: A review.

Demethylation and desulfonation of textile industry dye, Thiazole Yellow G by Aspergillus niger LAG.

The aim of this study was to investigate the removal of reactive dye (Remazol Red denoted as RR) from aqueous solutions onto green carbon under various experimental conditions. Green carbon derived from sunflower seed cake (SSCAC) by impregnation with 50% wt. NH 4 Cl solution following low temperature carbonization methods was characterized by FT-IR, SEM and elemental analysis. SSCAC was used as the adsorbent to examine the effects of pH, adsorbent dosage, contact time, temperature and electrolytes. The adsorption of RR on SSCAC was favored at acidic medium with pH value of 2. When 50 mg/L dye solution was used, the maximum dye removal was obtained as 88.97% with 0.4 g/50 mL adsorbent dosage within 1 h contact time. The adsorption isotherm was best defined by the Langmuir model and dimensionless separation factors (R L values) denoted that the adsorption was favorable. Kinetic study was found to be followed by the pseudo-second order model with high correlation coefficients.

R.Zerrin Yarbay Sahin

Papers

The Effect of Different Operating Conditions on Removal of Reactive Dye by Green Carbon Adsorption