Book excerpt: Membrane technology has received great popularity in many industrial sectors and significantly enhanced our abilities to restructure production processes, protect the environment and public health, and provide competitive strategies for separation and purification. However, the need for sustainable development has imposed new targets for this technology, such as more effective/precise separation and stricter admissible limits for the discharge of contaminants into the environment. Focusing on hot topic environment-related applications, Advances in Functional Separation Membranes introduces emerging membranes nanoengineered with attractive functions and discusses their key features. It also provides a comprehensive guide to various design strategies for such functional membranes, making it useful reference for environmental chemists and membrane engineers alike.