<p>Heavy metals pollution has become a serious environmental issue, posing a significant threat to ecosystem health and human well-being. Therefore, various sustainable remediation strategies are crucial for mitigating adverse effects. The role of Nanoparticles-Silicon (Si-NPs) in plants has emerged as a promising solution to reduce the impact of heavy metals on plant growth and physiological processes. This review examined the mechanisms by which Si-NP modulates heavy metal metabolism in plants, providing various pathways for sustainable remediation and environmental protection. Si-NPs accumulation in plant tissues influences heavy metal uptake, transport, and detoxification by forming stable Si-metal complexes, which reduce heavy metal mobility and toxicity. These complexes minimize the translocation of heavy metals to aerial parts, thereby ensuring the protection of essential physiological functions. . Si-NPs play a pivotal role in reinforcing the plant's antioxidant defense machinery, effectively neutralizing reactive oxygen species (ROS) and minimizing oxidative damage triggered by heavy metal stress. It greatly stabilizes the cell walls and membranes, further strengthening plant resilience against heavy metal toxicity. Plant-specific responses to Si highlight the importance of tailoring remediation strategies to various living organisms and environmental conditions. Optimizing Si-NPs application by utilizing unique methods, sources, and appropriate dosages is crucial to maximize its efficacy in plant growth. Moreover, interactions between Si and edaphic factors, such as soil pH and nutrient availability, must be understood in holistic remediation approaches. This review revealed that the ecological significance of Si-NPs-mediated modulation of heavy metals in sustainable remediation frameworks. Future research should focus on mechanistic insights, field trials, and the assessment of the environmental impacts of silicon-based interventions.</p> Graphical abstract <p></p>