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首页> 外文会议>International Conference on Bioinformatics and Biomedical Engineering >Kinetics and Mechanisms of Copper Sorption by Loosely Bound Extracellular Polymeric Substances (LB-EPS) from Activated Sludge under Simulating Bio-Calcification Conditions
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Kinetics and Mechanisms of Copper Sorption by Loosely Bound Extracellular Polymeric Substances (LB-EPS) from Activated Sludge under Simulating Bio-Calcification Conditions

机译：在模拟生物钙化条件下，松散结合的细胞外聚合物物质（LB-EPS）松散结合的细胞外聚合物物质（LB-EP）的动力学和机制

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The behavior and fate of copper binding with extracellular polymeric substances (EPS) from activated sludge, under simulating bio-calcification, was studied. Results showed that the degree of EPS sequestering with calcium had a strong differential affect on copper sorption. At lower Ca2+ concentrations (≤80 mg?l-1), the Langmuir equation was able to model adsorptive processes between Cu2+ and EPS, which showed competitive adsorption between free Cu2+ and Ca2+ ions. However, at higher Ca2+ concentrations (>80 mg?l-1), the competitive sorption between Cu2+ and Ca2+ was replaced by bio-calcification which isolated Cu2+ from EPS. Three-dimensional fluorescence spectrum and Fourier transform-infrared spectra analysis of LB-EPS indicated that the EPS sample was composed of humic acid-like and proteins-like complexes containing proteins, polysaccharides and lipids that reacted with the investigated metal ions. Microscopic images of crystal structure and configuration, with the increase of Ca2+ concentrations, showed that calcification needles gradually grew and the aggregating EPS inchmeal dissolved. In essence, EPS are potential good for sequestering free Cu2+ from freshwaters. However in the presence of Ca2+, LB-EPS also acts as a nucleation site for bio-calcification "marl" deposition which reduces Cu2+ adsorption. Bio-lithification layer formation in combination with high calcium bio-adsorption levels significantly reduced, but did not eliminate, copper bio-adsorption in EPS.
机译：研究了在模拟生物钙化下与激活污泥的细胞外聚合物物质（EPS）的铜结合的行为和命运。结果表明，钙螯合的EPS螯合程度对铜吸附具有强烈的差异影响。在较低的Ca2 +浓度（≤80mg≤1-1），Langmuir方程能够在Cu2 +和EPS之间模拟吸附过程，其显示出在游离Cu 2 +和Ca2 +离子之间的竞争吸附。然而，在较高的Ca2 +浓度（> 80毫克？L-1）和Cu2 +和Ca2 +之间的竞争吸附物通过生物钙化其中分离的Cu2 +从EPS取代。 LB-EP的三维荧光谱和傅里叶变换 - 红外光谱分析表明，EPS样品由腐殖酸样和蛋白质样络合物组成，含有与所研究的金属离子反应的蛋白质，多糖和脂质。随着Ca2 +浓度的增加，晶体结构和配置的微观图像显示，钙化针逐渐增长，并溶解的聚集EPSInmeal。从本质上讲，EPS对从新鲜水域进行汇集的抵消来汇集免费CU2 +的潜力是良好的。然而，在CA2 +的存在下，LB-EP也用作生物钙化“MARL”沉积的成核位点，其降低CU2 +吸附。生物溶液层形成与高钙生物吸附水平的组合显着降低，但未消除EPS中的铜生物吸附。

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