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. 2021 Jul;107(1):167-174.
doi: 10.1007/s00128-021-03189-5. Epub 2021 Mar 28.

Remediation of Soil in a Deserted Arsenic Plant Site Using Synthesised MgAlFe-LDHs

Kai Zhong  1 , Chaolan Zhang  2 , Siwei Ren  1 , He Huang  3 , Qun Rong  3 , Yongxin Zhou  4
Affiliations

Remediation of Soil in a Deserted Arsenic Plant Site Using Synthesised MgAlFe-LDHs

Kai Zhong et al. Bull Environ Contam Toxicol. 2021 Jul.

Abstract

Layered double hydroxides (LDHs) are promising soil contamination amendment agents for its efficient absorbing abilities. However, the application of LDHs in remediation of heavy metal contaminated soil are to be developed. In this study, we synthesized MgAlFe-LDHs by introducing Fe3+ into interlayer of the MgAl-LDHs using co-precipitation method. X-ray diffraction (XRD), Fourier transform infrared spectrometer (FT-IR) and scanning electron microscope (SEM) were employed to characterized the micro structure of MgAlFe-LDHs. And then pot incubation and pilot experiments were conducted to investigate the heavy metal removal efficiencies of MgAlFe-LDHs and its potential being applicated in As contaminated soil amendment from a deserted arsenic plant site. Incubation experiments showed that the MgAlFe-LDHs had a higher removal efficiency on arsenic contaminated soil compared to other agents. And the results of pilot experiments indicated that the MgAlFe-LDHs can immobilize up to 90% of the As in soil with 5% (w/w) addition. Based on the results above, MgAlFe-LDHs are promising materials amending the heavy metal contaminated soil with practical application value.

Keywords: Arsenic contamination; Engineering application; Ferrous materials; Layered double hydroxides; Soil remediation.

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