Environmental pollution from industrial, agricultural, and domestic sources has raised significant global concerns, creating an urgent need for sustainable remediation strategies. Green nanotechnology offers a promising solution, focusing on eco-friendly synthesis methods, sustainability, and the development of advanced nanomaterials. This chapter explores the creation, mechanisms, and applications of green synthesized nanomaterials for the photodegradation of environmental contaminants. It covers various types of pollutants, including both organic and inorganic contaminants, and highlights sustainable synthesis strategies, such as utilizing renewable resources and non-toxic methods. The material properties of green nanomaterials, including their structural features and photocatalytic activities, are thoroughly examined. Additionally, the chapter discusses the efficiency of these materials in breaking down pollutants through photodegradation, emphasizing the advantages of green synthesis in terms of reduced environmental impact and enhanced performance. The potential industrial applications of green nanomaterials are also highlighted, demonstrating their relevance in various sectors, including wastewater treatment, air purification, and soil remediation. The chapter underscores the importance of renewable resources and non-toxic methodologies in advancing environmentally friendly technologies, with a focus on promoting global environmental health and sustainability.