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Dai Q, Zhang T, Zhao Y, Li Q, Dong F, Jiang C. Potentiality of living Bacillus pumilus SWU7-1 in biosorption of strontium radionuclide. CHEMOSPHERE 2020; 260:127559. [PMID: 32673872 DOI: 10.1016/j.chemosphere.2020.127559] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Revised: 06/21/2020] [Accepted: 06/28/2020] [Indexed: 06/11/2023]
Abstract
Bacillus pumilus SWU7-1 was isolated from strontium ion (Sr(II))-uncontaminated soil, its biosorption potential was evaluated, and the effect of γ-ray radiation treatment on its biosorption was discussed. Domesticated under Sr(II) stress promoted the biosorption ability of B. pumilus to Sr(II), and the biosorption efficiency increased from 46.09% to 94.69%. At a lower initial concentration, the living bacteria had the ability to resist the biosorption of Sr(II). The optimal initial concentration range was 54-130 mg/L. The biosorption profile was better matched by Langmuir than Freundlich model, showing that the biosorption process of Sr(II) by the experimental strain was closer to the surface adsorption. According to Langmuir model, the maximum biosorption capacity of B. pumilus on Sr (II) was 299.4 mg/g. During the bacterial growth in the biosorption process, the changes in biosorption capacity and efficiency can be divided into two phases, and a pseudo-second-order model is followed in each phase. There was no significant difference in the biosorption efficiency of bacteria with different culture time after γ-ray radiation, and all of them were above 90%, which showed that B. pumilus had significant radiation resistance under experimental conditions. This study emphasized the potential application of B. pumilus in the treatment of radioactive Sr(II) pollution by biosorption.
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Affiliation(s)
- Qunwei Dai
- Fundamental Science on Nuclear Waste and Environmental Safety Laboratory (SWUST), Mianyang City, Sichuan, 621010, China; Key Laboratory of Solid Waste Treatment and Resource Recycle (SWUST, Ministry of Education), Mianyang City, Sichuan, 621010, China.
| | - Ting Zhang
- Key Laboratory of Solid Waste Treatment and Resource Recycle (SWUST, Ministry of Education), Mianyang City, Sichuan, 621010, China
| | - Yulian Zhao
- Key Laboratory of Solid Waste Treatment and Resource Recycle (SWUST, Ministry of Education), Mianyang City, Sichuan, 621010, China
| | - Qiongfang Li
- Key Laboratory of Solid Waste Treatment and Resource Recycle (SWUST, Ministry of Education), Mianyang City, Sichuan, 621010, China
| | - Faqin Dong
- Key Laboratory of Solid Waste Treatment and Resource Recycle (SWUST, Ministry of Education), Mianyang City, Sichuan, 621010, China
| | - Chunqi Jiang
- Frank Reidy Research Center for Bioelectrics, Old Dominion University, Norfolk, VA, 23508, USA
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Li X, Cai Y, Liu D, Ai Y, Zhang M, Gao Y, Zhang Y, Zhang X, Yan X, Liu B, Yu H, Mielke HW. Occurrence, fate, and transport of potentially toxic metals (PTMs) in an alkaline rhizosphere soil-plant (Maize, Zea mays L.) system: the role of Bacillus subtilis. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:5564-5576. [PMID: 30612356 DOI: 10.1007/s11356-018-4031-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2018] [Accepted: 12/17/2018] [Indexed: 06/09/2023]
Abstract
Utilization of microbes is one of the most promising methods to remediate potentially toxic metals (PTMs) from soil. In this study, a systematic investigation was conducted to study the influence of Bacillus subtilis on PTMs occurrence, fractionation, translocation, and accumulation in the rhizosphere soil of Maize (Zea mays L.) in pot experiments. B. subtilis showed strong effects on the fate and mobility of Pb, Sb, Ni, Zn, Cu, and Cr, and it also affected PTMs' distribution in the rhizosphere soil, maize growth, and microbial community structure. Results showed that it was easier for Zn to accumulate in maize roots than other PTMs. According to chemical fractionation, B. subtilis tended to immobilize Pb, Sb, Ni, Zn, and Cu in the rhizosphere soil. Compared with other PTMs, Cr tended to be more available and more mobile, which indicated a higher health risk to the eco-environment. These findings suggested that B. subtilis could be used as a geomicrobiological stabilizer to immobilize PTMs (Pb, Sb, Ni, Cu, Zn) in alkaline soils and decrease their uptake by plants, thus reducing the risks of a potential transfer into the food chain.
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Affiliation(s)
- Xiaoping Li
- Department of Environmental Science, School of Geography and Tourism, Shaanxi Normal University, No.199 Chang'an South Street, Xi'an, Shaanxi, 710062, People's Republic of China.
- International Joint Research Centre of Shaanxi Province for Pollutant Exposure and Eco-environmental Health, Xi'an, Shaanxi, 710062, People's Republic of China.
| | - Yue Cai
- Department of Environmental Science, School of Geography and Tourism, Shaanxi Normal University, No.199 Chang'an South Street, Xi'an, Shaanxi, 710062, People's Republic of China
- International Joint Research Centre of Shaanxi Province for Pollutant Exposure and Eco-environmental Health, Xi'an, Shaanxi, 710062, People's Republic of China
| | - Dongying Liu
- Department of Environmental Science, School of Geography and Tourism, Shaanxi Normal University, No.199 Chang'an South Street, Xi'an, Shaanxi, 710062, People's Republic of China
- International Joint Research Centre of Shaanxi Province for Pollutant Exposure and Eco-environmental Health, Xi'an, Shaanxi, 710062, People's Republic of China
| | - Yuwei Ai
- Department of Environmental Science, School of Geography and Tourism, Shaanxi Normal University, No.199 Chang'an South Street, Xi'an, Shaanxi, 710062, People's Republic of China
- International Joint Research Centre of Shaanxi Province for Pollutant Exposure and Eco-environmental Health, Xi'an, Shaanxi, 710062, People's Republic of China
| | - Meng Zhang
- Department of Environmental Science, School of Geography and Tourism, Shaanxi Normal University, No.199 Chang'an South Street, Xi'an, Shaanxi, 710062, People's Republic of China
- International Joint Research Centre of Shaanxi Province for Pollutant Exposure and Eco-environmental Health, Xi'an, Shaanxi, 710062, People's Republic of China
| | - Yu Gao
- Department of Environmental Science, School of Geography and Tourism, Shaanxi Normal University, No.199 Chang'an South Street, Xi'an, Shaanxi, 710062, People's Republic of China
- International Joint Research Centre of Shaanxi Province for Pollutant Exposure and Eco-environmental Health, Xi'an, Shaanxi, 710062, People's Republic of China
| | - Yuchao Zhang
- Department of Environmental Science, School of Geography and Tourism, Shaanxi Normal University, No.199 Chang'an South Street, Xi'an, Shaanxi, 710062, People's Republic of China
- International Joint Research Centre of Shaanxi Province for Pollutant Exposure and Eco-environmental Health, Xi'an, Shaanxi, 710062, People's Republic of China
| | - Xu Zhang
- Department of Environmental Science, School of Geography and Tourism, Shaanxi Normal University, No.199 Chang'an South Street, Xi'an, Shaanxi, 710062, People's Republic of China
- International Joint Research Centre of Shaanxi Province for Pollutant Exposure and Eco-environmental Health, Xi'an, Shaanxi, 710062, People's Republic of China
| | - Xiangyang Yan
- International Joint Research Centre of Shaanxi Province for Pollutant Exposure and Eco-environmental Health, Xi'an, Shaanxi, 710062, People's Republic of China
- School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an, Shaanxi, 710062, People's Republic of China
| | - Bin Liu
- Department of Environmental Science, School of Geography and Tourism, Shaanxi Normal University, No.199 Chang'an South Street, Xi'an, Shaanxi, 710062, People's Republic of China
- International Joint Research Centre of Shaanxi Province for Pollutant Exposure and Eco-environmental Health, Xi'an, Shaanxi, 710062, People's Republic of China
| | - Hongtao Yu
- International Joint Research Centre of Shaanxi Province for Pollutant Exposure and Eco-environmental Health, Xi'an, Shaanxi, 710062, People's Republic of China
- School of Computer, Mathematical and Natural Sciences, Morgan State University, Baltimore, MD, 21251, USA
| | - Howard W Mielke
- Department of Pharmacology, School of Medicine, Tulane University, New Orleans, LA, 70112, USA
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