期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 820, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2022.153306
关键词
Cadmium; Magnetite; Biochar; Soil remediation; Microbial respiration
资金
- National Natural Science Foundation of China [42077301, 21876161]
- GDAS'Project of Science and Technology Development [2019GDASYL-0102006, 2019GDASYL-0301002]
- China Agricultural Research Service [CARS-23-B16]
- Guangdong Science and Technology Infrastructure development [2019B121201004]
This study develops a new strategy of biogeochemical Fe(II) generators to immobilize Cd in soils by activating microbial Fe(II) generation. The results show that a biochar modified magnetite (FeBC15) exhibits a higher adsorption capacity for Cd and promotes the conversion of Cd to stable crystalline Fe/Al bound form. This strategy can effectively reduce Cd uptake in rice.
This work has developed a new strategy of biogeochemical Fe(II) generators for activating microbial Fe(II) generation to immobilize Cd in soils through protons scavenging and coprecipitation. A new biochar modified magnetite (FeBC15) has been fabricated through a top-down method, with which microbial respiration can be stimulated in paddy soil. The FeBC15 exhibits a higher adsorption capacity for Cd than pristine magnetite (1.7 times). The results show that the available Cd can be reduced by 14.4% after adding FeBC15 compared to the control. More importantly, FeBC15 particles promote the conversion of MgCl2-Cd to stable crystalline Fe/Al bound Cd under the incubation period. The enhanced pH and Fe(II) leads to a comparably lower Cd availability in soils than in pristine soils, which are supported by the enhanced relative abundance of Geobacter and Clostridium with the FeBC15 treatment (i.e. up to 7.44-7.68 x 10(9) copies/g soil). The Diffusive Gradients in Thin-films (DGT) study indicates that FeBC15 can lower the replenish capacity of soils (i.e. K-dL values of 0.2-3.6 mL/g) to soil pore waters and limit root absorption. Pot exper-iments demonstrate that this strategy can alleviate the rice Cd content by 38.4% (< 0.2 mg/kg). This work paves a new pathway for reducing Cd uptake in rice, enabling sustainable remediation of paddy soil.
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