Stabilizing interaction of exopolymers with nano-Se and impact on mercury immobilization in soil and groundwater†,Environmental Science: Nano

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Stabilizing interaction of exopolymers with nano-Se and impact on mercury immobilization in soil and groundwater†
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2017-12-12 00:00:00 , DOI: 10.1039/c7en00628d
Xiaonan Wang _{1,

2,

3,

4,

5} , Wenjuan Song _{1,

2,

3,

4,

5} , Haifeng Qian _{1,

2,

3,

4,

5} , Daoyong Zhang _{1,

2,

3,

4,

5} , Xiangliang Pan _{1,

2,

3,

4,

5} , Geoffrey Michael Gadd _{6,

7,

8,

9,

10}

Affiliation

Remediation of metal-contaminated soils and waters using nanoparticles is highly limited by their strong tendency to aggregate in soil solution and natural water. In order to enhance the remediation of Hg⁰-contaminated soil solution and groundwater by Se nanoparticles (SeNPs), the effects of extracellular polymeric substances (EPS) on the stability of SeNPs and Hg⁰ removal were investigated. EPS from the selenite-reducing bacterium Citrobacter freundii Y9 were found to make SeNPs more negatively charged by strong adsorption, which significantly enhanced the stability of SeNPs. The protein, carboxylate, polysaccharide and lipid components of the EPS were involved in the adsorption to SeNPs. Fluorescence quenching titration measurements implied that the binding of proteinaceous substances in the EPS to SeNPs was static quenching. EPS can therefore enhance the remediation efficiency of SeNPs for soil solution and groundwater contaminated with Hg⁰. This study highlights that bacterial EPS can be used as an effective natural dispersant for SeNPs, therefore improving the efficiency of mercury immobilization in contaminated waters.

中文翻译：

外聚合物与纳米硒的稳定相互作用，对土壤和地下水中汞的固定化影响†

使用纳米颗粒对金属污染的土壤和水进行修复受到很大限制，因为它们很容易在土壤溶液和天然水中聚集。为了增强硒纳米颗粒（SeNPs）对Hg ⁰污染土壤溶液和地下水的修复作用，研究了细胞外聚合物（EPS）对SeNPs稳定性和Hg ⁰去除的影响。减少亚硒酸盐的细菌弗氏柠檬酸杆菌的EPS发现Y9通过强吸附使SeNPs带更多的负电荷，从而显着增强了SeNPs的稳定性。EPS中的蛋白质，羧酸盐，多糖和脂质成分参与了对SeNPs的吸附。荧光猝灭滴定测量表明，EPS中的蛋白质物质与SeNPs的结合是静态猝灭。因此，EPS可以提高SeNPs对Hg ⁰污染的土壤溶液和地下水的修复效率。这项研究强调，细菌EPS可用作SeNPs的有效天然分散剂，因此提高了将汞固定在污水中的效率。

更新日期：2017-12-12

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