Water is regarded as an important element for sustainable development and many countries are attempting to provide clean water for municipal and industrial sectors. Owning to population explosion, industrial activities, agricultural practices and urbanisation, water bodies are polluted with various pollutants such as dyes, heavy metals, etc.. This first volume focuses on utilization of different promising nanocomposites for water and wastewater remediation. It provides an overview of wastewater treatment technologies, and explores the performace of materials such as organic-inorganic polymer hybrids, hydroxyapatite, magnetic composites (with polymers and biomaterials), zeolites, and so on in water and wastewater decontamination. The present edition takes into account various types of pristine and modified materials in different water treatment methods such as adsorption, catalysis and phoatalysis. Recent advances and developments are discussed in this book, and it provides a valuable resource for researchers and professionals in different fields such as environmental and chemical engineering.