Key Laboratory of Degraded and Unused Land Consolidation Engineering, The Ministry of Natural Resources, Xi'an, 710075, China.
College of Chemistry and Chemical Engineering, Shaanxi Key Research Laboratory of Chemical Additives, Shaanxi University of Science & Technology, Xi'an, 710021, China.
Environ Sci Pollut Res Int. 2021 Mar;28(10):12648-12658. doi: 10.1007/s11356-020-11202-3. Epub 2020 Oct 21.
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 Pb, 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.
重金属铅是一种典型的广泛存在的潜在有毒元素（PET）污染，因为它们在工业过程中广泛而广泛地应用。因此，非常需要开发一种经济有效的方法来防止潜在有毒元素铅残留在土壤中进入食物。一种新型的基于腐殖酸的修复材料（HA/WV），结合腐殖酸盐（HA）、生物炭粉（BC）和木醋液（WV），是一种廉价且环保的木炭加工工业副产品，已被制备和评估。结果表明，向 300mg Pb 污染的农业用地 0-20cm 表土中添加 0.10g 修复材料 HA/WV（质量比为 1:1），土壤中有效 Pb 的还原率可达到 61.4%。特别是木醋液可以提高有效 Pb 的还原率，至少比没有木醋液提高 14.7%。此外，根据吸附相互作用的分析和 HA/WV 上含氧官能团与 Pb(II)之间的静电引力，是 Pb(II)吸附的主要机制。木醋液可以提高 HA/WV 中的含氧基团，从而增强修复材料和 Pb(II)离子的络合作用。
