Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education)/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education)/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
J Hazard Mater. 2021 Feb 15;404(Pt A):124046. doi: 10.1016/j.jhazmat.2020.124046. Epub 2020 Sep 28.
With the wide use of graphene-like nanosheets, especially in agriculture, their release into the environment, it is crucial to grasp the fate of nanosheets in soil and minimum ecological risks. The present work discovered that leaching and migration of nanosheets (rGO) in soil is affected by soil porosity and adsorption processes. And the contents of rGO-Pd in soil layers and leachate increased and then decreased with the decreased of soil porosity. Moreover, physicochemical properties of rGO-Pd nanosheets changed by leaching processes, especially the changes of morphology, thickness and oxygen functional groups. Leaching of rGO-Pd also interfered the soil microbial homeostasis accompanied by the increase of microbial species richness and community diversity. In addition, rGO-Pd altered the usage of carbon sources by edaphon. The utilization of carbon sources by soil microbes, such as polymers, sugars, phenolic acids, carboxylic acids, amino acids, and amines, was also reduced by nanosheets. These findings provide new insights into environmental behaviors of nanomaterials and nanogeochemistry.
随着类石墨烯纳米片的广泛应用，特别是在农业领域，它们被释放到环境中，因此了解纳米片在土壤中的命运和最小的生态风险至关重要。本研究发现，纳米片（rGO）在土壤中的淋滤和迁移受土壤孔隙率和吸附过程的影响。并且，随着土壤孔隙率的降低，rGO-Pd 在土壤层和淋出液中的含量先增加后减少。此外，rGO-Pd 的物理化学性质会因淋滤过程而发生变化，特别是形态、厚度和含氧官能团的变化。rGO-Pd 的淋滤还会干扰土壤微生物的内稳态，伴随着微生物物种丰富度和群落多样性的增加。此外，rGO-Pd 改变了土壤微生物对碳源的利用。土壤微生物对碳源的利用，如聚合物、糖、酚酸、羧酸、氨基酸和胺类，也会被纳米片减少。这些发现为纳米材料的环境行为和纳米地球化学提供了新的见解。
