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Equilibrium, Thermodynamic, and Kinetic Studies on Some Metal Ions Biosorption Using Black Yeast Aureobasidium pullulans Biomass

机译:黑酵母金黄色芽孢杆菌生物质对某些金属离子生物吸附的平衡,热力学和动力学研究

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摘要

The bioremediation of Pb~(2+), Cu~(2+), Ni~(2+), and Co~(2+) ions onto Aureobasidium pullulans biomass was studied in batch procedure. The extents to which the experimental variables such as pH, contact time, stirring rate, and temperature affect the efficiency of biosorption were examined. The optimum values of pH (pH= 5), amount of biomass, and contact time (1 day) were found to be 5.0, 1 g, and 24 h, respectively. The equilibrium data were fitted to the Lang-muir and Freundlich isotherm models. The Freundlich model showed better (q = 75-82 for different metal ions and R= 1) fit and thus it was more suitable for the interpretation of experimental equilibrium data for Pb~(2+), Cu~(2+), Ni~(2+), and Co~(2+) ions adsorption onto A. pullulans. The kinetic data at various contact time were analyzed by applying different models which showed that the biosorption process of metal ions onto A. pullulans biomass obeys the first order kinetics Pb~(2+) and for Co~(2+) ions while it obeys the second order kinetics for Cu~(2+) and Ni~(2+) ions.
机译:分批研究了Pb〜(2 +),Cu〜(2 +),Ni〜(2+)和Co〜(2+)离子对金黄色芽孢杆菌生物量的修复作用。检查了诸如pH,接触时间,搅拌速率和温度等实验变量对生物吸附效率的影响程度。最佳pH值(pH = 5),生物量和接触时间(1天)分别为5.0、1 g和24 h。将平衡数据拟合到Lang-muir和Freundlich等温线模型。 Freundlich模型显示出更好的拟合度(对于不同的金属离子,q = 75-82,R = 1),因此它更适合于解释Pb〜(2 +),Cu〜(2 +),Ni的实验平衡数据〜(2+)和Co〜(2+)离子吸附在支链淀粉上。应用不同模型分析了不同接触时间下的动力学数据,结果表明金属离子在A. Pullulans生物量上的生物吸附过程遵循一阶动力学Pb〜(2+),而Co〜(2+)离子遵循Cu〜(2+)和Ni〜(2+)离子的二阶动力学

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