Salty water desalination using carbon nanotube sheets

Adsorption of divalent heavy metal ions from water using carbon nanotube sheets

“…As described earlier [32], CNT sheets were synthesized by chemical vapor deposition (CVD) method at 750 • C. The CVD reactor consisted of a horizontal stainless steel tube (70 cm long, 3.2 cm in diameter) was housed in a one stage cylindrical furnace, in which nitrogen was used to carry a gas mixture of precursors toward the center of the reactor, where pyrolysis of the gases took place and CNT sheets were deposited on the reactor walls. The precursor solution was a mixture of catalyst (ferrocene; purity ≥98%, B.D.H.)…”

“…and carbon source (cyclohexanol; purity ≥98%, Fluka) with mass ratio of 1:10, brought to its boiling point in a flask (steel container) connected to the reactor. Evaporating the reagents was performed using an oil bath (details of the synthesis process were presented elsewhere [32,33]). The as-synthesized CNT sheets were immersed in concentrated nitric acid (65%, Merck) for 20 h and then washed using deionized water several times until pH of the washing water showed no change, then dried at 110 • C for 24 h. This oxidized CNT sheets were used as adsorbent for heavy metal ions removal from water.…”

“…Also, adsorption of toxic substances by CNTs may enhance the toxicity of CNTs and further affect the transfer of toxic substances in the environment. Therefore, economical waste water treatment without CNT leakage into water is preferable [32].…”

“…In our previous study [32], CNT sheets were synthesized by chemical vapor deposition method and oxidized with concentrated nitric acid and then employed as a practical adsorbent for sodium chloride removal from water. In the present work, capability of the oxidized CNT sheets for various divalent heavy metal ions (Cu 2+ , Zn 2+ , Pb 2+ , Cd 2+ , Co 2+ ) removal from water was investigated.…”

Adsorption of polyphosphinocarboxylic acid (PPCA) scale inhibitor on carbon nanotubes (CNTs): A prospective method for enhanced oilfield scale prevention

“…CNTs have recently been studied [16][17][18][19][20] to desalinate brackish and sea water using various methods. It is shown that CNTs are capable of attracting sodium in the solution and enabling water to pass through the CNTs membrane [17][18][19] .…”