Green nanotechnology is the field that is concerned with the application of nanotechnology for environmental sustainability. It aims to minimize potential environmental and human health risks associated with the development, manufacture and use of nanotechnology products through the adoption of new nano-products that are ecofriendly throughout their lifecycles. The applications of this field include cleaning of hazardous wastes, water treatment, environmental remediation and monitoring of environmental pollutants. Current research in this domain explores solar cells, nanoremediation, cleaning oil spills, removing plastics from oceans, etc. The various studies that are constantly contributing towards advancing technologies and evolution of this field are examined in detail in this book. It provides significant information of this discipline to help develop a good understanding of green nanotechnology. As this field is emerging at a rapid pace, the contents of this book will help the readers understand the modern concepts and applications of the subject.