期刊
CHEMOSPHERE
卷 276, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.130116
关键词
Biochar; Mg-Al layered double hydroxides; Immobilization; Uranium; Soil
资金
- Natural Science Foundation of China [41761069]
- Natural Science Foundation of Jiangxi, China [20181ACB20004, 20202BABL203027]
The study successfully immobilized uranium contamination in soil by synthesizing a composite material, effectively remediating uranium-threatened soil environments; Experimental results showed that the composite material could stabilize uranium in soil at a certain dosage and reduce leaching losses of uranium; The study revealed that mechanisms such as surface complexation, co-precipitation, and reduction were involved in the adsorption and immobilization of uranium.
The decommissioning of uranium mill tailings (UMTs) is usually accompanied by uranium (U) contamination in soil, which poses a serious threat to human health and ecological safety. In this study, a novel phosphorus-modified bamboo biochar (PBC) cross-linked Mg-Al layered double-hydroxide (LDH) composite (PBC@LDH) was successfully prepared by phosphate pre-impregnation and a hydrothermal method with Mg-Al LDH. Physicochemical analysis revealed that phosphorus-containing functional groups and Mg-Al LDH were grafted onto the pristine biochar (BC) matrix. Laboratory-scale incubation and column leaching experiments were performed on the prepared BC, PBC, and PBC@LDH. The results showed that, at a dosage of 10%, the PBC@LDH composite had a commendable ability to immobilize U in soil. After 40 days of incubation with the stabilizer, the more mobile U was converted into immobilized species. Furthermore, during a column leaching experiment with simulated acid rain, the cumulative loss and leaching efficiency of U were remarkably reduced by PBC@LDH treatment compared with the control, reaching 53% and 54%, respectively. Surface complexation, co-precipitation, and reduction described the adsorption and immobilization mechanisms. In conclusion, this research demonstrates that the PBC@LDH composite offers a potentially effective amendment for the remediation of U contaminated soil. (C) 2021 Elsevier Ltd. All rights reserved.
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