Abstract
Carbon nanotubes (CNTs) are used as adsorbents, catalysts or catalyst support, membranes, and electrodes to solve many environmental potential problems. Research has been directed onto the surface modifications of CNTs and their effect on its adsorption behavior and their subsequent utilization in the removal of obnoxious heavy metals from wastewater. This chapter presents a review of number of parameters and their subsequent effects, such as: pH of the solution, dosage of CNTs, contact time, temperature of the solution and the charge on the surface on the use of CNT as adsorbent for heavy metal removal. It is established that the adsorption capacity of CNTs towards heavy metals can be enhanced by surface modifications=. New methods which do not cause any harm to the environment for the modification of CNTs surface, regeneration/reuse of CNTs require investigation. Future research exploring the techniques for a cost-effective CNT production is recommended.
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