INDUROT and Environmental Technology, Biotechnology and Geochemistry Group, Campus de Mieres, Universidad de Oviedo, Mieres, Asturias, Spain.
Departamento de Ciencia de Materiales e Ingeniería Metalúrgica and Environmental Technology, Biotechnology and Geochemistry Group, Universidad de Oviedo, Oviedo, Spain.
Environ Sci Pollut Res Int. 2020 Sep;27(27):33681-33691. doi: 10.1007/s11356-020-09586-3. Epub 2020 Jun 12.
Here we tested the capacity of zero valent iron nanoparticles (nZVI) combined with two organic amendments, namely, compost and biochar, to immobilize metal(oid)s such as As, Cu, Pb, and Zn. In addition, the effects of the amendments on the development of Brassica juncea L., a plant widely used for phytoremediation purposes, were also examined. To perform the experiments, pots containing polluted soil were treated with nZVI, compost-biochar, or a blend of compost-biochar-nZVI. Metal(oid)s availability and soil properties were evaluated after 15 and 75 days, and the height and weight of the plants were measured to determine development. The compost-biochar amendment showed excellent capacity to immobilize metals, but As availability was considerably increased. However, the addition of nZVI to the mixture corrected this effect considerably. In addition, soil treatment with nZVI alone led to a slight increase in Cu availability, which was not observed for the mixture with organic amendments. With respect to soil properties, the CEC and pH were enhanced by the compost-biochar amendment, thereby favoring plant growth. Nevertheless, the nanoparticles reduced the concentration of available P, which impaired plant growth to a certain extent. In conclusion, Fe-based nanoparticles combined with organic amendments emerge as powerful approaches to remediate soils contaminated by metals and metalloids.
在这里，我们测试了零价铁纳米颗粒（nZVI）与两种有机改良剂（即堆肥和生物炭）结合的能力，以固定金属（如 As、Cu、Pb 和 Zn）。此外，还研究了这些改良剂对广泛用于植物修复目的的 Brassica juncea L. 植物发育的影响。为了进行实验，在含有污染土壤的盆中用 nZVI、堆肥-生物炭或堆肥-生物炭-nZVI 混合物进行处理。在 15 天和 75 天后评估了金属（如）的可用性和土壤性质，并测量了植物的高度和重量以确定其发育情况。堆肥-生物炭改良剂具有极好的固定金属的能力，但 As 的可用性大大增加。然而，向混合物中添加 nZVI 可大大纠正这种效果。此外，单独用 nZVI 处理土壤会导致 Cu 的可用性略有增加，而与有机改良剂的混合物则没有观察到这种情况。就土壤性质而言，堆肥-生物炭改良剂提高了 CEC 和 pH 值，从而有利于植物生长。然而，纳米颗粒降低了有效磷的浓度，这在一定程度上影响了植物的生长。总之，基于 Fe 的纳米颗粒与有机改良剂相结合是修复受金属和类金属污染土壤的有效方法。
