Book excerpt: This book provides a cross-disciplinary, multi-scale assessment of the development of adsorption-based refrigerants and super-adsorbent-based wastewater purification. The book covers two major aspects from the 21st century, including the development of an environmentally benign adsorption cooling system and the preparation of a super-adsorbent for water purification. Although work has been published on these topics, the authors present the latest findings and introduce some new perspectives. The book is written as a reference book with contributions from global field experts and will appeal to water engineers, chemists, environmentalists, physicists, material scientists, nano-technologists, and environmental technologists.