Deposition of Magnetite Nanoparticles in Activated Carbons and Preparation of Magnetic Activated Carbons

Abstract

Abstract. Magnetic activated carbons (MACs) for gold recovery from alkaline cyanide solutions have been developed by mixing a magnetic precursor with a carbon source, and treating the mixture under controlled conditions. As would be expected, these activated carbons have high specific surface areas due to their microporous structure. In addition, the small particle size of the MACs produced allows rapid adsorption of gold in solution, and the magnetic character of these MACs enables recovery from suspension by magnetic separation.

Aflatoxin B1 detoxification by magnetic carbon nanostructures prepared from maize straw

“…5(a) and 5(b)) of magnetic carbon nanocomposites show broad band at 1,039.63 and 574.79 cm −1 . The intense peak in the regions of 1,000-1,200 correspond to stretching of C-C and C-O in carbon [13], and 574.70 can be attributed to stretching of Fe-O deposited magnetite.…”

“…In addition, the small particle size of iron oxide produced on the surface of carbon allows rapid adsorption. According to Kahani et al, the conversion of biomass into magnetic carbon nanocomposites would provide an excellent and cheap adsorbent for the remediation environmental problems [13]. In this research work, a new, simple, and cost-effective method was applied for the preparation of magnetic carbon nanocomposites from maize straw as aflatoxin B1 binder.…”

“…It is a useful technique to show information about crystal morphology, nature of surface hydroxyl groups, and adsorbed H 2 O. Usually in literature, the broad band at 580 and 400 cm −1 corresponds to various magnetite samples [13]. The IR spectrums (far and mid regions Figs.…”

“…The activated carbon is being used as a gorgeous and cheap source for the adsorption of organic and inorganic pollutants. By virtue of its high surface area and porous structure it can remove organic compounds dispersed or dissolved in liquids [13]. In addition, the small particle size of iron oxide produced on the surface of carbon allows rapid adsorption.…”

Effects of Fe2+ and Fe3+ ratio impregnated onto local commercial activated carbon coconut shell powder on the dye removal efficiency

“…In the preparation step, three kinds of solutions containing Fe 2+ and Fe 3+ were prepared with a molar ratio of Fe 2+ and Fe 3+ of 1:1 (MAC-1), 1:2 (MAC-2), and 2:1 (MAC-3). In order to complete the reaction and precipitation of the particles, the solutions were adjusted under alkaline condition with NH 4 OH (25%), heated at temperature of 80 o C (Kahani et al, 2010), and strong stirred. Prior to the reaction, the solutions were injected by N 2 gas to prevent potential oxidation.…”