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 (2–10), temperatures (25°C, 35°C, and 45°C) and dye concentrations (25–400 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. How to cite: Ozturk A, Bayol E, Abdullah MI. Characterization of the biosorption of fast black azo dye K salt by the bacterium Rhodopseudomonas palustris 51ATA strain. Electron J Biotechnol 2020;46. https://doi.org/10.1016/j.ejbt.2020.05.002 .

中文翻译：

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沼泽红假单胞菌 51ATA 菌株对快速黑色偶氮染料 K 盐的生物吸附特性

摘要背景已经研究了微生物通过吸附、降解或积累从废水中去除染料。用于染料处理的生物方法通常总是有效且环保的。在这项研究中，通过分光光度法研究了沼泽红假单胞菌 51ATA 对固黑 K 盐偶氮染料的生物吸附，在不同的 pH 值（2-10）、温度（25°C、35°C 和 45°C）和染料浓度下(25–400 毫克 L-1)。结果该菌株在各种染料浓度下表现出极好的去染料潜力。不同温度下的红外研究表明，染料在较低温度下吸附在细菌表面。通过 Scatchard 分析在 25°C 和 35°C 下研究了吸附过程的特性。对该细菌上染料的平衡结合数据的 Scatchard 分析产生了线性图，表明可以应用朗缪尔模型。从 Freundlich 和 Langmuir 模型获得的染料回归系数是显着的，并且观察到与 Scatchard 图的差异。结论 染料对该细菌的吸附行为由 Langmuir、Freundlich 和 Temkin 等温线表示。不同温度下的吸附数据非常适合 Freundlich 等温线。然而，当 Langmuir 和 Temkin 等温线模型应用于这些数据时，只有在较低温度下才能获得染料的良好拟合，因此表明 R. palustris 51ATA 的生物吸附能力取决于温度、pH 和染料浓度。如何引用：Ozturk A，Bayol E，阿卜杜拉 MI。沼泽红假单胞菌 51ATA 菌株对快速黑色偶氮染料 K 盐的生物吸附特性。电子 J 生物技术 2020；46。https://doi.org/10.1016/j.ejbt.2020.05.002。