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. 2021 Mar;28(10):12648-12658.
doi: 10.1007/s11356-020-11202-3. Epub 2020 Oct 21.

Wood vinegar enhances humic acid-based remediation material to solidify Pb(II) for metal-contaminated soil

Junfeng Zhu  1   2 , Weichun Gao  3 , Wentian Zhao  3 , Lei Ge  4 , Ting Zhu  3 , Guanghua Zhang  3 , Yuhua Niu  3
Affiliations

Wood vinegar enhances humic acid-based remediation material to solidify Pb(II) for metal-contaminated soil

Junfeng Zhu et al. Environ Sci Pollut Res Int. 2021 Mar.

Abstract

Heavy metal lead is a typical widespread potentially toxic element (PET) contamination due to their extensive and wide applications in industrial processes. The development of cost-effective methods for preventing potentially toxic element lead residues from soil into food is thus highly desirable. A new type of humic acid-based remediation material (HA/WV) incorporating humic acid salt (HA), biochar powder (BC), and wood vinegar (WV), which is a cheap and environmentally friendly industrial by-product from charcoal processing, was prepared and evaluated. The results showed that 0.10 g remediation material HA/WV with a mass ratio of 1:1 was added to 1 kg surface soil of 0-20 cm from agricultural land contaminated by 300 mg Pb2+, the reduction ratio of available Pb in soil can reach 61.4%. Especially, wood vinegar can enhance the reduction ratio of available Pb by at least 14.7% over without wood vinegar. Furthermore, according to the analysis of adsorption interaction and the electrostatic attraction between Pb(II) and oxygen-containing functional groups on HA/WV are the dominant mechanisms responsible for Pb(II) sorption. The wood vinegar liquid can improve the oxygen-containing group in HA/WV, which can enhance the complexation of remediation materials and Pb(II) ion.

Keywords: Adsorption performance; Humic acid salt; Lead contaminated soil; Remediation mechanism; Wood vinegar.

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