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Water pollution by heavy metal ions has become a serious environmental issue especially due to their toxicity and tendency for bioaccumulation [1]. Industrial wastewater is considered the main source of lead impurities. Excessive exposure to lead may result in anemia, mental retardation, coma, seizures, and bizarre behavior. Thus, it is necessary to remove this species from wastewater prior to its discharge into the environment. There exist various chemical and physical–chemical methods for the treatment of lead-containing wastewater: chemical precipitation, electrochemical reduction, ion exchange, biosorption, adsorption, among others [2]. Even though there are so many adsorbents available, there is still a need for developing novel materials to more effectively remove metal ions [3]. In this regard, a new type of adsorbent materials has been proposed – nanoporous carbon. It retains a great potential for the removal of a wide range of pollutants such as lead, chromium, nickel, copper, and other ions [4]. Researchers have found that nanoporous carbon materials such as carbon nanotubes (CNTs) have a relatively large surface area, extraordinary surface morphology and good chemical and mechanical properties that provide a good opportunity for the removal of heavy metals [5].

An equilibrium study of the liquid-phase sorption of Lead (II) ions on nanoporous carbon materials