Key Laboratory of Degraded and Unused Land Consolidation Engineering, the Ministry of Natural Resources of the People's Republic of China, 710075, China; Shaanxi Key Research Laboratory of Chemical Additives, College of Chemistry and Chemical Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China.
Shaanxi Key Research Laboratory of Chemical Additives, College of Chemistry and Chemical Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China.
Ecotoxicol Environ Saf. 2021 Jun 1;215:112159. doi: 10.1016/j.ecoenv.2021.112159. Epub 2021 Mar 30.
Biochar (BC) combined with humic acid (HA) and wood vinegar (WV) was designed and prepared as an inexpensive, effective, and environmentally friendly immobilization material (BHW) for metal-polluted soil. The influences of the wood vinegar and humic acid on the immobilization properties and adsorption mechanism of this new material were also investigated. The remediation performance was evaluated using a laboratory-made, nickel-contaminated soil with a Ni concentration of 200 mg per kg surface soil (top 20 cm from agricultural land). The results indicated that the immobilization ratio sequence of nickel (II) in the soil was BC< BH< BHW. The maximum adsorption capacity increased in the same order: BC< BH< BHW. All three adsorption isotherms were better fitted by the Freundlich model, which were consistent with the surface heterogeneity of the remediation materials. The cause of this surface heterogeneous migration may be due to the increase in oxygen-containing groups in the BC introduced by the HA and WV. The WV can increase the number of the oxygen-containing groups in the BC combined with HA, which enhanced the adsorption and immobilization of Ni ions. The results suggested that BHW is recommended for the remediation of metal-contaminated soils, because of its high efficacy, economic feasibility, environmental and food safety.
生物炭（BC）与腐殖酸（HA）和木醋液（WV）结合，被设计并制备为一种廉价、有效且环保的金属污染土壤固定化材料（BHW）。还研究了木醋液和腐殖酸对这种新材料的固定化性能和吸附机制的影响。采用实验室制备的镍污染土壤（农田表层 20cm 土壤中镍浓度为 200mg/kg）评估了修复性能。结果表明，土壤中镍（II）的固定化率顺序为 BC<BH<BHW。最大吸附容量也按相同顺序增加：BC<BH<BHW。所有三种吸附等温线都更符合 Freundlich 模型，这与修复材料的表面非均质性一致。这种表面非均相迁移的原因可能是由于 HA 和 WV 引入的 BC 中含氧基团增加。WV 可以增加与 HA 结合的 BC 中的含氧基团数量，从而增强 Ni 离子的吸附和固定。结果表明，由于其高效、经济可行性、环境和食品安全，BHW 被推荐用于修复金属污染土壤。
