Kang, Yu-Gyeong Yoon, Hakwon Lee, Chung-Seop Kim, Eun-Ju Chang, Yoon-Seok 2024-01-19T20:31:55Z 2024-01-19T20:31:55Z 2021-09-02 2019-03-15 0043-1354 https://pubs.kist.re.kr/handle/201004/120206 In this study, MnO2-coated Fe3O4 nanocomposite (Fe3O4 @MnO2) was utilized to decompose H2O2 to remove dyes via advanced oxidation processes and adsorptive bubble separation (advanced ABS system). The combination of H2O2 and Fe3O4@MnO2 generated bubbles and formed a stable foam layer in the presence of a surfactant; sodium dodecyl sulfate (SDS) or cetyltrimethylammonium chloride (CTAC), separating dye from the solution. On the basis of radical quenching experiments, electron paramagnetic resonance and X-ray photoelectron spectroscopy analyses, it was confirmed that the MnO2 shell of catalyst was reduced to Mn(2)o(3) by H2O2, generating radicals and oxygen gas for the removal of dyes. In the advanced ABS system, .OH and O-1(2) were the main radical species and the O-2 concentrations of 0.34 and 0.71 mM were increased in the solution and headspace, respectively. The advanced ABS system demonstrated a high removal efficiency of methylene blue (MB) (99.0%) and the removal rate increased with increasing amounts of components (H2O2, catalyst and SDS). Also, the advanced ABS system maintained high removal efficiency of MB at a wide pH range of 3-9. In addition to the anionic surfactant of SDS, CTAC was applied as a cationic surfactant for the advanced ABS of anionic dyes. Lastly, the scale-up system was applied to remediate dye-contaminated river water and industrial wastewater for possible practical applications. (C) 2019 Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD SODIUM DODECYL-SULFATE HYDROGEN-PEROXIDE DECOMPOSITION SYNTHETIC WASTE-WATER BIOLOGICAL TREATMENT DEGRADATION REMOVAL MNO2 ACTIVATION EFFICIENT H2O2 Advanced oxidation and adsorptive bubble separation of dyes using MnO2-coated Fe3O4 nanocomposite Article 10.1016/j.watres.2018.12.038 1 WATER RESEARCH, v.151, pp.413 - 422 WATER RESEARCH 151 413 422 scie scopus 000458224000039 2-s2.0-85059514410 Engineering, Environmental Environmental Sciences Water Resources Engineering Environmental Sciences & Ecology Water Resources Article SODIUM DODECYL-SULFATE HYDROGEN-PEROXIDE DECOMPOSITION SYNTHETIC WASTE-WATER BIOLOGICAL TREATMENT DEGRADATION REMOVAL MNO2 ACTIVATION EFFICIENT H2O2 Dye Fe3O4@MnO2 nanocomposite Hydrogen peroxide Advanced oxidation processes Adsorptive bubble separation