This book contents of five chapters, chapter one includes an introduction to the carbon nanotubes, dyes and objective of work. Chapter two includes the discovery and history, structure and size and synthesis methods, applications, purification techniques, functionalization of carbon nanotubes and technologies for color removal and adsorption. Chapter three includes the carbon nanotubes synthesis by catalytic chemical vapor deposition method and a several methods of treatment to increase the efficiency of carbon nanotubes. Chapter four includes two parts the first one is the carbon nanotubes characterizations by several methods such as XRD, SEM, TEM, FTIR, AFM and BET and the second part is the removal of dyes and the effects of several variables on the efficiency of removal and the adsorption isotherms.