| The effect of interaction between Bacillus subtilis DBM and soil minerals on Cu(Ⅱ) and Pb(Ⅱ) adsorption |
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| 基金项目： | the National Key R&D Program of China;the Natural Science Foundation of China;the 111 Project;the Natural Science Foundation of Guangdong Province,China |
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| 摘 要： | The effects of interaction between Bacillus subtilis DBM 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 NH_4NO_3 and EDTA-Na_2.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.
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| 收稿时间： | 2018-08-02 |
The effect of interaction between Bacillus subtilis DBM and soil minerals on Cu(II) and Pb(II) adsorption |
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| Jun Bai,Yuanqing Chao,Yanmei Chen,Shizhong Wang,Rongliang Qiu. The effect of interaction between Bacillus subtilis DBM and soil minerals on Cu(II) and Pb(II) adsorption[J]. Journal of environmental sciences (China), 2019, 31(4): 328-337 |
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| Authors: | Jun Bai Yuanqing Chao Yanmei Chen Shizhong Wang Rongliang Qiu |
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| Affiliation: | 1. School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China;2. School of Public Health, Southwest Medical University, Luzhou 646000, China;3. Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China;4. Guangdong Provincial Engineering Research Center for Heavy Metal Contaminated Soil Remediation, Sun Yat-sen University, Guangzhou 510275, China |
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| Abstract: | |
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| Keywords: | Goethite Kaolinite Cu Pb |
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