Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 52, Issue 23, Pages 13925-13934Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.8b05409
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Funding
- National Natural Science Foundation of China [21577099, 21777118]
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Novel, 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 zeta potential, and X-ray photoelectrons spectroscopy. Formation of new hydrogen bonds, change in zeta 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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