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Characterization of the biosorption of fast black azo dye K salt by the bacterium Rhodopseudomonas palustris 51ATA strain
Öztürk, Ayten; Bayol, Emel; Abdullah, Meysun I.
  • Öztürk, Ayten; Nigde Ömer Halisdemir University. Department of Biotechnology. Nigde. TR
  • Bayol, Emel; Nigde Ömer Halisdemir University. Department of Chemistry. Nigde. TR
  • Abdullah, Meysun I; Near East University. Faculty of Pharmacy. TR
Electron. j. biotechnol ; 46: 22-29, jul. 2020. tab, graf
Article in English | LILACS | ID: biblio-1223226
ABSTRACT

BACKGROUND:

Removal of dyes from wastewater by microorganisms through adsorption, degradation, or accumulation has been investigated. Biological methods used for dye treatment are generally always effective and environmentally friendly. In this study, biosorption of the Fast Black K salt azo dye by the bacterium Rhodopseudomonas palustris 51ATA was studied spectrophotometrically, at various pH (2­10), temperatures (25°C, 35°C, and 45°C) and dye concentrations (25­400 mg L-1).

RESULTS:

The bacterial strain showed extremely good dye-removing potential at various dye concentrations. IR studies at different temperatures showed that the dye was adsorbed on the bacterial surface at lower temperatures. Characteristics of the adsorption process were investigated by Scatchard analysis at 25°C and 35°C. Scatchard analysis of the equilibrium binding data for the dye on this bacterium gave rise to linear plots, indicating that the Langmuir model could be applied. The regression coefficients obtained for the dye from the Freundlich and Langmuir models were significant and divergence from the Scatchard plot was observed.

CONCLUSION:

The adsorption behavior of the dye on this bacterium was expressed by the Langmuir, Freundlich, and Temkin isotherms. The adsorption data with respect to various temperatures provided an excellent fit to the Freundlich isotherm. However, when the Langmuir and Temkin isotherm models were applied to these data, a good fit was only obtained for the dye at lower temperatures, thus indicating that the biosorption ability of R. palustris 51ATA is dependent on temperature, pH, and dye concentration.
Subject(s)


Full text: Available Index: LILACS (Americas) Main subject: Rhodopseudomonas / Diazonium Compounds / Coloring Agents Type of study: Prognostic study Language: English Journal: Electron. j. biotechnol Journal subject: Biotechnology Year: 2020 Type: Article Affiliation country: Cyprus / Turkey Institution/Affiliation country: Near East University/TR / Nigde Ömer Halisdemir University/TR

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Full text: Available Index: LILACS (Americas) Main subject: Rhodopseudomonas / Diazonium Compounds / Coloring Agents Type of study: Prognostic study Language: English Journal: Electron. j. biotechnol Journal subject: Biotechnology Year: 2020 Type: Article Affiliation country: Cyprus / Turkey Institution/Affiliation country: Near East University/TR / Nigde Ömer Halisdemir University/TR