Effective impregnation for the preparation of magnetic mesoporous carbon: application to dye adsorption

Journal of Chemical Technology and Biotechnology - Tập 92 Số 8 - Trang 1899-1911 - 2017
Hayarpi Saroyan1, Dimitrios A. Giannakoudakis2,1,3, C. Sarafidis4, Nikolaos K. Lazaridis1, Eleni A. Deliyanni1
1Division of Chemical Technology, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki, Greece
2Department of Chemistry, The City College of New York, New York, NY, USA
3Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, New York, NY, USA
4Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, Greece

Tóm tắt

AbstractBACKGROUNDIn this study, magnetic mesoporous activated carbons were synthesized either via co‐precipitation of iron salts onto activated carbon or via impregnation of activated carbon with magnetic nanoparticles by sonication. The resulting impregnated carbons were examined as adsorbents for the removal of Reactive Black 5 (RB5) from aqueous solutions.RESULTSThe magnetic nanocomposites were characterized by various techniques (nitrogen adsorption, Fourier transform infrared spectroscopy, X‐ray diffraction, vibrating sample magnetometry, and scanning electron microscope measurements). The results of characterization analyses revealed that co‐precipitation was unsuccessful for the preparation of magnetic carbon while sonication led to a super‐paramagnetic activated carbon. Adsorption studies revealed that although magnetic carbon presented a decreased adsorption capacity compared with raw carbon, it was an acceptable dye adsorbent. High pH and high ionic strength values favored dye adsorption, while the data of adsorption isotherms and kinetics were better fitted by the Freundlich isotherm model and the pseudo‐second‐order kinetic model, respectively. Regeneration of dye‐loaded activated carbons by thermal re‐activation and re‐use of regenerated samples were also investigated.CONCLUSIONMesoporous magnetic activated carbon, with a saturation magnetization of 18 emu g−1, was successfully synthesized by sonication of activated carbon and magnetite nanoparticles. The magnetic carbon was found to be an adequate dye adsorbent with a maximum adsorption capacity of 445.294 mg g−1. © 2017 Society of Chemical Industry

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