Book excerpt: Showcasing a selection of new research on nanotechnological applications for environmental protection along with new advanced technologies in nanochemistry, this volume presents an interdisciplinary approach that brings together materials science, chemistry, and nanotechnology. Part I of the volume looks at environmental topics that include an exploration of the challenges of the global water crisis and new technology in nanofiltration and water purification. It provides an informative overview of green nanotechnology, green nanomaterials, and green chemistry. Some of the advanced technologies discussed in Part II include the application of quantum dots, a nanochemical approach to using ICT technology, and new research on polymer nanocomposites as a smart material along with its synthesis, preparation, and properties. Other important topics are included as well.