This study aimed to investigate the kinetics, isotherms, and thermodynamics of biosorption of the cationic dye rhodamine B by a low-cost biosorbent prepared from Aspergillus oryzae cells. Culture medium composition (mineral salts, nitrogen source, and carbon source) influenced removal efficiency, and dye removal increased with increasing biosorbent concentrations until a plateau was reached at 10 g L⁻¹. Temperature and dye concentration were directly related to removal, and the highest removal efficiency was obtained at 40 °C and 200 mg L⁻¹ of dye. The adsorption kinetics was best fitted to a pseudo-second-order model, and equilibrium data were well described by the Freundlich equation. Thermodynamic analysis indicated that the biosorption of rhodamine B by A. oryzae cells is physical in nature, spontaneous, and more favorable at higher temperatures and dye concentrations. Overall, the results suggest that inactivated A. oryzae biomass is a promising biosorbent for the removal of cationic dyes from wastewater.

中文翻译：

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罗丹明B的生物吸附使用低成本的米曲霉细胞的灭活：动力学，平衡和热力学研究。

这项研究旨在研究由米曲霉细胞制备的低成本生物吸附剂对阳离子染料若丹明B的生物吸附的动力学，等温线和热力学。培养基组成（矿物盐，氮源和碳源）影响去除效率，并且染料去除率随着生物吸附剂浓度的增加而增加，直到达到10 g L ^-1的平稳水平为止。温度和染料浓度与去除直接相关，在40°C和200 mg L ^-1的染料下可获得最高的去除效率。吸附动力学最适合拟二阶模型，平衡数据由Freundlich方程很好地描述。热力学分析表明罗丹明B的生物吸附米曲霉细胞是自然的，自发的，并且在较高的温度和染料浓度下更有利。总体而言，结果表明，灭活的米曲霉生物质是从废水中去除阳离子染料的有前途的生物吸附剂。