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Remediation of Soil Polluted with Cd in a Postmining Area Using Thiourea-Modified Biochar

Author

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  • Yanfeng Zhu

    (Engineering Research Center of Ministry of Education for Mine Ecological Restoration, China University of Mining and Technology, Xuzhou 221008, Jiangsu, China
    College of Chemical Engineering, Huaqiao University, Xiamen 361021, China)

  • Jing Ma

    (Engineering Research Center of Ministry of Education for Mine Ecological Restoration, China University of Mining and Technology, Xuzhou 221008, Jiangsu, China
    Low Carbon Energy Institute, China University of Mining and Technology, Xuzhou 221008, Jiangsu, China)

  • Fu Chen

    (Engineering Research Center of Ministry of Education for Mine Ecological Restoration, China University of Mining and Technology, Xuzhou 221008, Jiangsu, China
    Low Carbon Energy Institute, China University of Mining and Technology, Xuzhou 221008, Jiangsu, China)

  • Ruilian Yu

    (College of Chemical Engineering, Huaqiao University, Xiamen 361021, China)

  • Gongren Hu

    (College of Chemical Engineering, Huaqiao University, Xiamen 361021, China)

  • Shaoliang Zhang

    (Engineering Research Center of Ministry of Education for Mine Ecological Restoration, China University of Mining and Technology, Xuzhou 221008, Jiangsu, China)

Abstract

Cadmium presence in soil is considered a significant threat to human health. Biochar is recognized as an effective method to immobilize Cd ions in different soils. However, obtaining effective and viable biochar to remove elevated Cd from postmining soil remains a challenge. More modifiers need to be explored to improve biochar remediation capacity. In this investigation, pot experiments were conducted to study the effects of poplar-bark biochar (PBC600) and thiourea-modified poplar-bark biochar (TPBC600) on Cd speciation and availability, as well as on soil properties. Our results showed that the addition of biochar had a significant influence on soil properties. In the presence of TPBC600, the acid-soluble and reducible Cd fractions were transformed into oxidizable and residual Cd fractions. This process effectively reduced Cd bioavailability in the soil system. Compared to PBC600, TPBC600 was more effective in improving soil pH, electrical conductivity (EC), organic matter (SOM), total nitrogen (TN), ammonium nitrogen ( NH 4 + - N ), nitrate nitrogen ( NO 3 − - N ), available potassium (AK), available phosphorus (AP), and available sulfur (AS). However, this improvement diminished as incubation time increased. Results of Pearson correlation analysis, multivariate linear regression analysis, and principal component analysis showed that soil pH and available phosphorus played key roles in reducing the available cadmium in soil. Therefore, TPBC600 was shown to be an effective modifier that could be used in the remediation of soil polluted with Cd.

Suggested Citation

  • Yanfeng Zhu & Jing Ma & Fu Chen & Ruilian Yu & Gongren Hu & Shaoliang Zhang, 2020. "Remediation of Soil Polluted with Cd in a Postmining Area Using Thiourea-Modified Biochar," IJERPH, MDPI, vol. 17(20), pages 1-13, October.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:20:p:7654-:d:431874
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    References listed on IDEAS

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    1. Dan Zhou & Dan Liu & Fengxiang Gao & Mengke Li & Xianping Luo, 2017. "Effects of Biochar-Derived Sewage Sludge on Heavy Metal Adsorption and Immobilization in Soils," IJERPH, MDPI, vol. 14(7), pages 1-15, June.
    2. Xiaoxiao Li & Jing Ma & Yongjun Yang & Huping Hou & Gang-Jun Liu & Fu Chen, 2019. "Short-Term Response of Soil Microbial Community to Field Conversion from Dryland to Paddy under the Land Consolidation Process in North China," Agriculture, MDPI, vol. 9(10), pages 1-17, October.
    3. Jihong Dong & Wenting Dai & Jiren Xu & Songnian Li, 2016. "Spectral Estimation Model Construction of Heavy Metals in Mining Reclamation Areas," IJERPH, MDPI, vol. 13(7), pages 1-18, June.
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    1. Sufang Xing & Zhen Yan & Chao Song & Huifang Tian & Shuguang Wang, 2022. "Limited Role of Rhamnolipids on Cadmium Resistance for an Endogenous-Secretion Bacterium," IJERPH, MDPI, vol. 19(19), pages 1-14, October.

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