Jung, Kyung-Won Choi, Brian Hyun Ahn, Kyu-Hong Lee, Sang-Hyup 2024-01-20T00:02:40Z 2024-01-20T00:02:40Z 2021-09-03 2017-11-30 0169-4332 https://pubs.kist.re.kr/handle/201004/122030 A novel magnetic adsorbent of Fe3O4/gamma-Al2O3 hybrid composite (denoted as M-Fe/Al-H) was developed electrochemically via a sequential application of iron and aluminum electrodes in a one-pot fashion, which called here as electrode-alternation technique, followed by pyrolysis. Physical and chemical properties of the prepared adsorbents were characterized and their feasibility towards the removal of di-anionic azo dye Acid Black 1 (AB1) was assessed. Textural and structural characterization revealed that the prepared M-Fe/Al-H possesses superior properties than those of M-Fe (sole usage of iron electrode), which may improve the adsorption capacity. Kinetics revealed that the adsorption equilibrium was reached within 12 h with approximately 90% of the equilibrium adsorption capacity within the first 3 h. Comprehensive analysis using the pseudo-second order and intraparticle diffusion models indicated that the dominant mechanism of the reaction is film diffusion with intraparticle diffusion being the rate determining step. The adsorption equilibrium isotherm data were best represented by the Sips isotherm model, which found to be approximately 1501, 1786, and 1959 mg/g at 283, 293, and 303 K, respectively. The exceptional performance as well as its ease of separation allows M-Fe/Al-H to be a promising candidate as an effective for azo dye removal from various aqueous medium. (C) 2017 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV ACID ORANGE 7 AQUEOUS-SOLUTION ELECTROCHEMICAL SYNTHESIS EFFICIENT ADSORBENT FE3O4 NANOPARTICLES MESOPOROUS CARBON FACILE SYNTHESIS GREEN SYNTHESIS METHYL VIOLET ANIONIC DYES Synthesis of a novel magnetic Fe3O4/gamma-Al2O3 hybrid composite using electrode-alternation technique for the removal of an azo dye Article 10.1016/j.apsusc.2017.06.172 1 APPLIED SURFACE SCIENCE, v.423, pp.383 - 393 APPLIED SURFACE SCIENCE 423 383 393 scie scopus 000410607500044 2-s2.0-85021080414 Chemistry, Physical Materials Science, Coatings & Films Physics, Applied Physics, Condensed Matter Chemistry Materials Science Physics Article ACID ORANGE 7 AQUEOUS-SOLUTION ELECTROCHEMICAL SYNTHESIS EFFICIENT ADSORBENT FE3O4 NANOPARTICLES MESOPOROUS CARBON FACILE SYNTHESIS GREEN SYNTHESIS METHYL VIOLET ANIONIC DYES Electrochemical synthesis Magnetic adsorbent Magnetite Gamma alumina Acid black 1