Over the past decade PAn is considered so applicable ranging from electrical and electrochemical to many fields due to its cheapness, easily reversible redox properties, superior solubility in water and more stability in air than the other conducting polymers. As the first conducting polymer commercialized, PAn has significant flexibility in modifying its chemical structures and therefore the electrical and mechanical properties. This book is therefore focused on study, the adsorption behavior of arsenic ions from aqueous solutions using conductive polymer-biosorbent (PAn/RH) nanocomposite as a function of concentration, temperature, pH and time.