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Humic acid coupled with coal gasification slag for enhancing the remediation of Cd-contaminated soil under alternated light/dark cycle

Abstract

In this study, the synthesis of a coal gasification slag-humic acid (SA) hybrid was purposed for the remediation of cadmium (Cd)-contaminated soil. In order to investigate the effect of SA on the Cd-contaminated soil and plant growth, a series of experiments were carried out under different illumination condition. The results showed that the SA has some the photocatalytic activity, and adding 10 wt% of SA to the soil could obviously improve the soil fertility and decrease the mobility of Cd in the soil under alternated light/dark cycle (12L/12D); the content of the residual fraction in the SA-amended soil reached 69.5%, and the Cd decreasing rates for the leaf, stem, and root of Artemisia ordosica were near 100%, 91.3%, and 75.3%, respectively. Characterizations of amendments suggested that the synergistic effect of precipitation and surface complexation played a major role in the remediation of Cd-contaminated soil.

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Funding

Funding and support were provided by the following projects: National Natural Science Foundation of China (41,967,022, 42,107,446), The Joint Fund of the Yulin University and the Dalian National Laboratory for Clean Energy (YLU-DNL Fund 2,021,019), The Key Laboratory Project of Shaanxi Provincial Education Department in China (21JS047).

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Yulin Xiang: investigation, writing—original draft, writing—review and editing, funding acquisition, supervision, project administration, conceptualization, methodology. Yuxiu Xiang: software, data curation. Xuchun Gao: visualization.

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Correspondence to Yulin Xiang.

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Xiang, Y., Xiang, Y. & Gao, X. Humic acid coupled with coal gasification slag for enhancing the remediation of Cd-contaminated soil under alternated light/dark cycle. Environ Sci Pollut Res (2022). https://doi.org/10.1007/s11356-022-22308-1

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  • DOI: https://doi.org/10.1007/s11356-022-22308-1

Keywords

  • Accumulation
  • Bioavailability
  • Cadmium
  • SA
  • Soil properties
  • Soil remediation