PVP@Fe3O4磁性纳米材料对耐镉促生菌与龙葵联合体系修复土壤镉污染的调控机理

土壤重金属污染是全球范围的重要环境问题，我国土壤镉（Cd）污染点位超标率高居榜首，严重影响我国农业可持续发展，急需绿色高效可持续的土壤修复技术。本项目以PVP表面修饰型四氧化三铁磁性纳米材料（PVP@Fe3O4NPS）作为土壤Cd污染的环境修复增效剂，与生物技术相结合，探究纳米材料对耐Cd促生菌-超积累植物联合修复体系的调控机理，拟从以下几个方面展开研究：1）PVP@Fe3O4NPS对耐Cd促生菌-龙葵联合修复体系Cd修复效果的调控；2）PVP@Fe3O4NPS对耐Cd促生菌植物促生特性及耐Cd效应的影响；3）PVP@Fe3O4NPS对生物联合修复体系中植物生长及抗逆性机制的影响。通过项目研究，揭示纳米材料对耐Cd促生菌-龙葵修复体系的直接调控作用与间接调控机理，将为环境纳米修复与生物修复的协同效应研究提供理论依据，形成绿色高效可持续的修复新方法，推动土壤污染修复研究深入发展。

Heavy metal pollution is an important environmental issue worldwide. Cadmium(Cd) pollution in China ranks the first in the percentage of soil samples exceeding the Ministry of Environmental Protection (MEP) limit, which severely influence the sustainable development of agriculture in China, thus exploring green, efficient and sustainable soil remediation technology is urgent. The present project will explore the mechanism of polyvinylpyrrolidone coated magnetic nanoparticles (PVP@Fe3O4NPS) to regulate Cd remediation in soil by Cd-resistant plant growth promoting bacteria and hyperaccumulator, combining biotechnology and nanoparticles as a novel enhancement substance for environmental remediation. Three research contents are included: 1) Regulation of PVP@Fe3O4NPS to Cd remediation efficiency by the combination of Cd-resistant plant growth promoting bacteria and Solanum nigrum L; 2) Effects of PVP@Fe3O4NPS on plant growth promoting properties and Cd resistance of the bacteria; 3) Effects of PVP@Fe3O4NPS on plant growth and stress response mechanisms in the joint bioremediation system. This research will reveal the direct regulation effect and indirect regulation mechanism of NPs on remediation system by Cd-resistant plant growth promoting bacteria and Solanum nigrum L, which will provide a theoretical basis for the research on the synergistic effect of environmental nanoremediation and bioremediation, and form a green, efficient and sustainable novel remediation methods to promote the in-depth development of soil pollution remediation research.