The discovery of carbon nanotubes has opened new windows for numerous applications in many disciplines of nanoscience and nanotechnology. Carbon nanotubes consist of graphene sheets in the form of sp2 hybridized carbon atoms. These materials have gained the interest of researchers from various disciplines due to their fascinating physico-chemical properties. This book describes the applications of carbon nanotubes in various areas including environmental science such as remediation and speciation, water research, medicine including sensors, targeted drug delivery and therapeutics. The application of carbon nanotubes in waste water research which includes organic, inorganic and microbial pollutants is also discussed as is its applications in material science and polymer science.