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

Junfeng Zhu, Weichun Gao, Wentian Zhao, Lei Ge, Ting Zhu, Guanghua Zhang, Yuhua Niu

Environmental science and pollution research international 2021 Mar

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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.

Citation

Junfeng Zhu, Weichun Gao, Wentian Zhao, Lei Ge, Ting Zhu, Guanghua Zhang, Yuhua Niu. Wood vinegar enhances humic acid-based remediation material to solidify Pb(II) for metal-contaminated soil. Environmental science and pollution research international. 2021 Mar;28(10):12648-12658