This book covers nanomaterials and smart technologies for environmental remediation, offering a focused and up-to-date perspective on key innovations in sustainable water and wastewater treatment, pollution control, and resource recovery. By combining foundational principles with recent advances, while presenting a unified framework developed through the author's research and analytical perspective, the book highlights the synthesis, functionalization, and mechanisms of both natural and engineered nanomaterials used in adsorption, photocatalysis, and integrated environmental systems. The chapters cover topics such as the role of multifunctional materials, renewable energy integration, and intelligent environmental systems that contribute to more efficient and sustainable treatment solutions. Readers will find discussions on emerging contaminants, material safety, and scalability, with particular attention given to smart and adaptive materials that are opening new frontiers in environmental monitoring and remediation. Key sections of the book are enriched with original insights and experimental data from the author's research program, providing a distinctive perspective on emerging challenges and solutions. The book also introduces the reader to the role of artificial intelligence, data analytics, and smart sensing in transforming traditional approaches into automated and adaptive environmental technologies, with analytical frameworks shaped by the author's hands-on experience in developing and implementing these systems. Intended for researchers, graduate students, and professionals in nanotechnology, environmental science, chemical and materials engineering, and sustainability, this book serves as a focused reference and guide for those working at the interface of materials science and environmental innovation. With its practical orientation, including original case studies and applications derived from the author's research work and real-world applications, the book offers valuable insights into the challenges and opportunities in the field, making it a must-read for those committed to advancing sustainable environmental practices.