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Mecanismo de biosorción de hierro ferroso por sustancias poliméricas extracelulares de la bacteria acidófila Acidiphilium sp

机译:嗜酸细菌Acidiphilium sp。的胞外聚合物对亚铁的生物吸附机理

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The aim of this work was to assess the uptake of Fe(II) by extracellular polymeric substances (EPS) from the acidophilic bacterium Acidiphillium 3.2Sup(5) . These EPS were extracted using EDTA. EPS of A. 3.2Sup(5) loaded in sorption tests with Fe(II), were characterized using the following experimental techniques: scanning electron microscopy (SEM) with energy dispersive X-ray microanalysis (EDX), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The experimental results indicate that EPS adsorb ferrous iron according to Freundlich model with a metal sorption uptake of K = 1.14 mg 1-1 L 1 g -1 and a sorption intensity of 1/ n = 1.26. In addition, ferrous iron sorption by EPS took place by preferential interaction with the carboxyl group which promotes the formation of ferrous iron oxalates (FeC 2 O 4 ). Since the interaction reaction was reversible ( Log K = 0.77 ± 0.33), that means that the cation sorption can be reversed at convenience.
机译:这项工作的目的是评估嗜酸性细菌Acidiphillium 3.2Sup(5)对胞外聚合物(EPS)吸收Fe(II)的影响。这些EPS使用EDTA提取。用以下实验技术表征了A. 3.2Sup(5)的Fe(II)吸附测试中的EPS:具有能量色散X射线显微分析(EDX)的扫描电子显微镜(SEM),X射线衍射(XRD) )和傅立叶变换红外光谱(FTIR)。实验结果表明,根据Freundlich模型,EPS吸附的铁离子的金属吸附量为K = 1.14 mg 1-1 / n L 1 / n g -1,吸附强度为1 / n = 1.26。另外,EPS与亚铁的吸附是通过与羧基的优先相互作用而发生的,从而促进了草酸亚铁(FeC 2 O 4)的形成。由于相互作用反应是可逆的(Log K = 0.77±0.33),这意味着阳离子吸附可以方便地逆转。

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