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Feng H, Wang Y, Li N, Qian Z, Chen T, Chen X, Wang Q, Zhu W. Effects of biochar pyrolysis temperature on uranium immobilization in soil remediation: Revealed by 16S rDNA and metabolomic analyses. JOURNAL OF HAZARDOUS MATERIALS 2024; 466:133502. [PMID: 38266586 DOI: 10.1016/j.jhazmat.2024.133502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 12/26/2023] [Accepted: 01/09/2024] [Indexed: 01/26/2024]
Abstract
Uranium-stressed soil caused by nuclear industry development and energy acquisition have attracted extensive attentions for a long time. This study investigated the effects of biochar application with different pyrolysis temperatures (300 ℃, 500 ℃ and 700 ℃) on remediation of uranium-stressed soil. The results showed that higher pyrolysis temperature (700 ℃) was benefit for ryegrass growing and caused a lower uranium accumulation in plants. At the same time, uranium immobilization was more effective at higher biochar pyrolysis temperature. Careful investigations indicated that activities of soil urease and sucrase were promoted, and bacterial diversity was strengthened in C700 group, which may contribute to uranium immobilization. The biochar application could activate metabolic of lipids and amino acids, organic acids and derivatives, and organic oxygen compounds. Nicotinate and nicotinamide metabolism, and Benzoxazinoid biosynthesis were unique metabolic pathways in the C700 group, which could enhance the uranium tolerance from different perspectives. Based on these results, we recommend to use biochar with 700 °C pyrolysis temperature when processing remediation of uranium-stressed soil. This study will facilitate the implementation of biochar screening and provide theoretical helps for remediation of uranium-stressed soil.
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Affiliation(s)
- Huachuan Feng
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China
| | - Yilin Wang
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China
| | - Nan Li
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China
| | - Zishu Qian
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China
| | - Tao Chen
- School of National Defense & Nuclear Science and Technology, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China; Chengdu Institute of Research and Innovation, Southwest University of Science and Technology, Chengdu 610000, China
| | - Xiaoming Chen
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China; Chengdu Institute of Research and Innovation, Southwest University of Science and Technology, Chengdu 610000, China
| | - Qing Wang
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China; Chengdu Institute of Research and Innovation, Southwest University of Science and Technology, Chengdu 610000, China.
| | - Wenkun Zhu
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China; Chengdu Institute of Research and Innovation, Southwest University of Science and Technology, Chengdu 610000, China.
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Yang W, Sun T, Sun Y. Adsorption mechanism of Cd 2+ on microbial inoculant and its potential for remediation Cd-polluted farmland soils. CHEMOSPHERE 2024; 352:141349. [PMID: 38307335 DOI: 10.1016/j.chemosphere.2024.141349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2023] [Revised: 01/29/2024] [Accepted: 01/30/2024] [Indexed: 02/04/2024]
Abstract
The adsorption characteristics and mechanism of Cd2+ on microbial inoculant (MI) mainly composed of Bacillus subtilis, Bacillus thuringiensis and Bacillus amyloliquefaciens, and its potential for remediation Cd polluted soils through batch adsorption and soil incubation experiments. It was found that the Freundlich isotherm model and the pseudo-second-order kinetics were more in line with the adsorption processes of Cd2+. The maximum adsorption capacity predicted by Langmuir isotherm model suggested that of MI was 57.38 mg g-1. Scanning electron microscopy and energy dispersive spectroscopy (SEM-EDS) images exhibited the surface structure of MI was damaged to varying degrees after adsorption, and Cd element was distributed on the surface of MI through ion exchange. X-ray diffraction (XRD) results showed that CdCO3 was formed on the surface of MI. Moreover, the functional groups (-OH, C-H, and -NH) involved in the adsorption of Cd2+ through fourier transform infrared spectroscopy (FTIR). After applying MI to Cd-contaminated soil, it was found that soil pH, conductivity (EC) and soil organic matter (SOM) increased by 0.84 %-2.43 %, 31.6 %-241.48 %, and 8.11 %-24.1 %, respectively, when compared with the control treatments. The content of DTPA-Cd in the soils was significantly (P < 0.05) reduced by 15.48 %-29.68 % in contrast with CK, and the Cd speciation was transformed into a more stable residual fraction. The activities of urease, phosphatase and sucrose were increased by 3.5 %-45.18 %, 57.00 %-134.18 % and 52.51 %-70.52 %, respectively, compared with CK. Therefore, MI could be used as an ecofriendly and sustainable material for bioremediation of Cd-contaminated soils.
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Affiliation(s)
- Wenhao Yang
- Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs (MARA)/Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Agro-Environmental Protection Institute, MARA, Tianjin, 300191, China; College of Resources and Environment, Northeast Agricultural University, Harbin, 150030, China
| | - Tong Sun
- College of Resources and Environment, Northeast Agricultural University, Harbin, 150030, China
| | - Yuebing Sun
- Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs (MARA)/Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Agro-Environmental Protection Institute, MARA, Tianjin, 300191, China; College of Resources and Environment, Northeast Agricultural University, Harbin, 150030, China.
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