Synthesis of CNTs was first reported by Iljima in 1991, even so
CNTs were synthesized prior to that date [26]. Subsequently, CNTs
have been intensively studied to elucidate their interesting
mechanical, electronic and optical properties [27]. CNTs have been
widely applied by various industries for wastewater treatment as
adsorbents. CNTs are well known for their favorable physicochemical
stability, high selectivity and structural diversity [28].
Extensive research of CNTs for wastewater treatment only began
in the last decade. CNTs are promising adsorbents for the treatment
of major polluting heavy metals, such as Cd(II) [29], Zn(II)
[29] and Pb(II) [30], as they exhibit high removal efficiencies.
Research using CNTs for treatment of dyes began in 2004:
Fugetsu et al. [31] investigated the adsorption of acridine orange,
ethidium bromide, eosin bluish, and orange G as model dyes using
CNTs