Abstract
Coal mining has produced a large amount of coal gangue. It makes the soil around the mining area seriously polluted by heavy metals, affects the growth of crops, and endangers human health. Therefore, there is an urgent need to develop new materials for remediation of Cd in soil. In this study, mercaptosilane-modified sepiolite (Q-Sep) was used as a basic passivator, and it was pretreated with acid (H-Q-Sep) and high temperature (R-Q-Sep) respectively. By analyzing the forms of Cd and pH values in soil after adding modified sepiolite, we compared the remediation effects of two modified methods on Cd in soil. The enrichment of spinach (Spinacia oleracea L) to Cd and changes in physiological and biochemical indexes of spinach were determined, and the effect of modified sepiolite on the growth of spinach was judged. The experimental results showed that the addition of modified sepiolite could significantly increase the soil pH values (p < 0.05); the content of exchangeable Cd in soil decreased by 60.4%; and the maximum increase of residual state was 32.9%. The absorption of Cd in soil by spinach decreased, and root length, plant height, and biomass of spinach all increased. It was proved that the addition of modified sepiolite can improve the productivity of soil, reduce toxicity of heavy metals in soil, and promote growth of plants. As a result, the addition of H-Q-Sep and R-Q-Sep can effectively repair Cd in gangue filled soil, which provides a certain theoretical basis for the passivation remediation of Cd in soil.
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We thank the editors and reviewers for providing suggestions regarding the language and extensive discussion.
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This work was supported by the National Natural Science Foundation of China (No. 42072201) and the University Synergy Innovation Program of Anhui Province (No. GXXT-2021-017).
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All authors contributed to the study conception and design. Yuchen Li: methodology, formal analysis, software, formal analysis, writing original draft, and visualization. Xing Chen and Liqun Zhang: data curation, validation, writing, review, and editing. Jie Hu and Chunlu Jiang: writing, review, and editing. Yongchun Chen and Shikai An: supervision. Liugen Zheng: conceptualization, resources, project administration, and funding acquisition.
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Li, Y., Zheng, L., Chen, X. et al. Restoration effect of sulfhydryl-modified sepiolite on cadmium in contaminated soil and its effect on the growth of spinach (Spinacia oleracea L). Environ Sci Pollut Res 30, 66598–66609 (2023). https://doi.org/10.1007/s11356-023-27102-1
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DOI: https://doi.org/10.1007/s11356-023-27102-1