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Rotating Magnetic Field-Assisted Adsorption Mechanism of Pollutants on Mechanically Strong Sodium Alginate/Graphene/l‑Cysteine Beads in Batch and Fixed-Bed Column Systems
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posted on 2018-11-08, 00:00 authored by Jie Ma, Yao Ma, Fei Yu, Xiaohu DaiNovel, efficient bioadsorbent sodium
alginate/graphene/l-cysteine (SA/GR/l-Cys) beads
were prepared and used for
magnetic field (MF)-assisted adsorption of pollutants. SA/GR/l-Cys has excellent mechanical properties, with a breaking stress
of 3.5 MPa at 79.8%, an elastic modulus of 5.0 MPa, low swelling properties
(average swelling ratio <300%), and good adsorption properties
toward organic pollutants and heavy metal ions. A rotating magnetic
field (RMF) was shown to have a better influence than a static magnetic
field (SMF) on adsorption, with enhanced adsorption capacities 5-fold
greater than those of the SMF. We investigated the different adsorption
mechanisms of model contaminants through Fourier transform infrared
spectroscopy, ζ potential, and X-ray photoelectrons spectroscopy.
Formation of new hydrogen bonds, change in ζ potential, and
acceleration in chemical reactions strongly influenced the adsorption
process under the RMF. In fixed-bed column adsorption, the breakthrough
time for column adsorption increased, and the adsorption capacity
improved by 30.66%. The costs and practical applications of SA/GR/l-Cys under RMF were also analyzed. This work demonstrated that
SA/GR/l-Cys could serve as a promising adsorbent for water
pollutants under RMF exposure and could be used in practical applications.
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breakthrough timemetal ionschemical reactions3.5 MPaadsorption propertiesadsorption mechanismscolumn adsorptionField-Assisted Adsorption MechanismX-ray photoelectrons spectroscopyFixed-Bed Column Systems NovelRMF exposureSMFadsorption processSAmodel contaminantsadsorption capacities 5-adsorption capacityfixed-bed column adsorptionhydrogen bonds5.0 MPawater pollutants