水相Pb2+、Cd2+和Ni2+离子在细胞外聚合物(EPS)上的生物吸附机理

IF 2.3 4区 生物学 Q3 MICROBIOLOGY
Archaea-An International Microbiological Journal Pub Date : 2020-06-22 eCollection Date: 2020-01-01 DOI:10.1155/2020/8891543
Di Cui, Chong Tan, Hongna Deng, Xunxue Gu, Shanshan Pi, Ting Chen, Lu Zhou, Ang Li
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引用次数: 23

摘要

重金属污染已成为人们日益关注的焦点,尤其是水环境中的Pb2+、Cd2+和Ni2+。研究了农杆菌胞外聚合物质(EPS)对三种重金属的吸附能力及机理。EPS对Pb2+、Cd2+和Ni2+的吸附效率分别为94.67%、94.41%和77.95%。Langmuir、Freundlich、Dubinin-Radushkevich等温线模型和拟二级动力学模型均能很好地拟合吸附实验数据。模型参数分析表明,EPS对Pb2+的吸附效率较高,化学吸附是吸附过程中的限速步骤。FTIR判断EPS中羧基的C=O官能团和糖衍生物的C-O-C在吸附过程中起主要作用。此外,3D-EEM谱显示酪氨酸还有助于EPS吸附三种重金属。而菌株F2的EPS对三种重金属二价离子的吸附机理几乎相同,因此Pb2+、Cd2+和Ni2+在EPS上的吸附效率差异可能与每种重金属的固有特性有关。本研究表明,EPS作为一种生物吸附剂在重金属污染治理中具有很大的应用潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Biosorption Mechanism of Aqueous Pb<sup>2+</sup>, Cd<sup>2+</sup>, and Ni<sup>2+</sup> Ions on Extracellular Polymeric Substances (EPS).

Biosorption Mechanism of Aqueous Pb<sup>2+</sup>, Cd<sup>2+</sup>, and Ni<sup>2+</sup> Ions on Extracellular Polymeric Substances (EPS).

Biosorption Mechanism of Aqueous Pb<sup>2+</sup>, Cd<sup>2+</sup>, and Ni<sup>2+</sup> Ions on Extracellular Polymeric Substances (EPS).

Biosorption Mechanism of Aqueous Pb2+, Cd2+, and Ni2+ Ions on Extracellular Polymeric Substances (EPS).

Heavy metal pollution has been a focus with increasing attention, especially Pb2+, Cd2+, and Ni2+ in an aqueous environment. The adsorption capacity and mechanism of extracellular polymeric substances (EPS) from Agrobacterium tumefaciens F2 for three heavy metals were investigated in this study. The adsorption efficiency of 94.67%, 94.41%, and 77.95% were achieved for Pb2+, Cd2+, and Ni2+ adsorption on EPS, respectively. The experimental data of adsorption could be well fitted by Langmuir, Freundlich, Dubinin-Radushkevich isotherm models, and pseudo-second-order kinetic model. Model parameters analysis demonstrated the great adsorption efficiency of EPS, especially for Pb2+, and chemisorption was the rate-limiting step during the adsorption process. The functional groups of C=O of carboxyl and C-O-C from sugar derivatives in EPS played the major role in the adsorption process judged by FTIR. In addition, 3D-EEM spectra indicated that tyrosine also assisted EPS adsorption for three heavy metals. But EPS from strain F2 used the almost identical adsorption mechanism for three kinds of divalent ions of heavy metals, so the adsorption efficiency difference of Pb2+, Cd2+, and Ni2+ on EPS could be correlated to the inherent characteristics of each heavy metal. This study gave the evidence that EPS has a great application potential as a bioadsorbent in the treatment of heavy metals pollution.

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来源期刊
CiteScore
7.50
自引率
0.00%
发文量
1
审稿时长
>12 weeks
期刊介绍: Archaea is a peer-reviewed, Open Access journal that publishes original research articles as well as review articles dealing with all aspects of archaea, including environmental adaptation, enzymology, genetics and genomics, metabolism, molecular biology, molecular ecology, phylogeny, and ultrastructure. Bioinformatics studies and biotechnological implications of archaea will be considered. Published since 2002, Archaea provides a unique venue for exchanging information about these extraordinary prokaryotes.
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