Heavy metal removal using carbon nanotube-biomorphic filters
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Carbon nanotubes (CNTs)-based composites have attracted substantial interest as potential adsorbents for heavy metalsremoval, due to their unique properties of chemical, mechanical, and thermal stability, and their high surface area. In thisstudy, carbon nanotube filters were fabricated by a three-step processing route of carbonising reaction of biomorphic carbonmaterials (BCMs), hydrothermal method for template synthesis and coating on the BCMs, and catalytic chemical vapordeposition (CCVD). The BCMs with well-developed hexagonal honeycomb structure were then subjected to a wetting processthat resulted in the formation of a Fe–, Co–, Cu–, and Ni–ion loaded LTA on the BCMs; and finally, the CNTs were synthesizedby catalytic chemical vapor deposition of acetylene (C2H2). Multi-walled carbon nanotubes (MWCNTs) with inner diameterof 7.31 nm, outer diameter of 38.53 nm, and maximum yield of 15.50% were synthesized at 650 °C for 120 min with Conanoparticles, and the ID/IG of CNTs of 0.97 was obtained. Aqueous solutions of Mn(II), Cu(II), Cr(III), Cd(II), and Pb(II) wereused to test for the removal of heavy metal. For the nanofiltration, we found removal efficiencies for Mn, Cu, Cr, Cd, and Pbof around (98.22, 99.29, 98.22, 98.41, and 99.99)%, respectively.
Abstract
Carbon nanotubes (CNTs)-based composites have attracted substantial interest as potential adsorbents for heavy metalsremoval, due to their unique properties of chemical, mechanical, and thermal stability, and their high surface area. In thisstudy, carbon nanotube filters were fabricated by a three-step processing route of carbonising reaction of biomorphic carbonmaterials (BCMs), hydrothermal method for template synthesis and coating on the BCMs, and catalytic chemical vapordeposition (CCVD). The BCMs with well-developed hexagonal honeycomb structure were then subjected to a wetting processthat resulted in the formation of a Fe–, Co–, Cu–, and Ni–ion loaded LTA on the BCMs; and finally, the CNTs were synthesizedby catalytic chemical vapor deposition of acetylene (C2H2). Multi-walled carbon nanotubes (MWCNTs) with inner diameterof 7.31 nm, outer diameter of 38.53 nm, and maximum yield of 15.50% were synthesized at 650 °C for 120 min with Conanoparticles, and the ID/IG of CNTs of 0.97 was obtained. Aqueous solutions of Mn(II), Cu(II), Cr(III), Cd(II), and Pb(II) wereused to test for the removal of heavy metal. For the nanofiltration, we found removal efficiencies for Mn, Cu, Cr, Cd, and Pbof around (98.22, 99.29, 98.22, 98.41, and 99.99)%, respectively.
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