The effect of interaction between Bacillus subtilis DBM and soil minerals on Cu(II) and Pb(II) adsorption.
The effect of interaction between Bacillus subtilis DBM and soil minerals on Cu(II) and Pb(II) adsorption.
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DOI：
10.1016/j.jes.2018.11.012
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发表时间：
2019-04
影响因子：
6.9
通讯作者：
Jun Bai;Y. Chao;Yanmei Chen;Shizhong Wang;R. Qiu
中科院分区：
文献类型：
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作者：
Jun Bai;Y. Chao;Yanmei Chen;Shizhong Wang;R. Qiu
研究了枯草芽孢杆菌DBM与土壤矿物相互作用对Cu（II）和Pb（II）吸附的影响。与DBM复合后，高岭石和针铁矿对Cu（II）和Pb（II）的吸附能力比单独使用时有所提高。电位滴定数据的模拟结果表明，DBM的加入使高岭石和针铁矿的位浓度分别提高了80%和30%。然而，在DBM/矿物组合中的官能团的参与导致较低的浓度的观察网站比理论值，并导致增强的解吸速率由NH 4 NO3和EDTA-Na 2。DBM-矿物复合物也可能有助于阻止重金属进入DBM细胞，从而提高DBM在重金属污染环境中的存活能力。在结合过程中，DBM胞外蛋白为矿物吸附Cu（II）和Pb（II）提供了更多的结合位点。特别是，一个特别稳定的络合位点之间形成针铁矿和磷酸二酯键从EPS，以提高铅（II）的吸附能力。因此，DBM-矿物复合物可以提高矿物对Cu（II）和Pb（II）的吸附能力，对重金属污染环境中的DBM起到保护作用。
The effects of interaction betweenBacillus subtilisDBM and soil minerals on Cu(II) and Pb(II) adsorption were investigated. After combination with DBM, the Cu(II) and Pb(II) adsorption capacities of kaolinite and goethite improved compared with the application of the minerals independently. The modeling results of potentiometric titration data proved that the site concentrations of kaolinite and goethite increased by 80% and 30%, respectively after combination with DBM. However, the involvement of functional groups in the DBM/mineral combinations resulted in lower concentrations of observed sites than the theoretical values and led to the enhancement of desorption rates by NH4NO3and EDTA-Na2. The DBM-mineral complexes might also help to prevent heavy metals from entering DBM cells to improve the survivability of DBM in heavy metal-contaminated environments. During the combination process, the extracellular proteins of DBM provided more binding sites for the minerals to absorb Cu(II) and Pb(II). In particular, an especially stable complexation site was formed between goethite and phosphodiester bonds from EPS to enhance the Pb(II) adsorption capacity. So, we can conclude that the DBM–mineral complexes could improve the Cu(II) and Pb(II) adsorption capacities of minerals and protect DBM in heavy metal-contaminated environments.