Book excerpt: Nanoscience technology is playing a vital role in multidisciplinary research due to its unique characteristics at nanoscale as compared to bulk materials. In view of such excellent properties, like high surface area, semiconducting nature, and non-toxicity, nanotechnology has emerged as a promising means to curb pollution. Liquid and crystal nanomaterials aim for products and processes that are ecofriendly, economically sustainable, safe, and energy-efficient. One of the most popular fields widely adopted is photocatalysis of nanomaterials that involves photo-conduction in efficient removal/degradation of noxious pollutants. This book focuses on generation of liquid and crystal nanomaterials for environmental remediation.