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Ana L. Popovic,Jelena D. Rusmirovic,Zlate Velickovic,Tihomir Kovacevic,Aleksandar Jovanovic,Ilija Cvijetic,Aleksandar D. Marinkovic 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.93 No.-
In-depth kinetic and column adsorption study for diclofenac, DCF, heavy-metal and oxyanions adsorptionon highly effective amino-functionalized lignin-based microsphere adsorbent (A-LMS) is examined. TheA-LMS was synthesized via inverse suspension copolymerization of industrial kraft lignin with the aminocontaining grafting-agent (polyethylene imine), and an epoxy chloropropane cross-linker. The batchadsorption results indicated process spontaneity and feasibility of a high removal capacity: DCF(151.13)>>Cd2+(74.84)>Cr(VI)(54.20)>As(V)(53.12)>Ni2+(49.42 mg g 1). The quantum chemical calculatedinteraction energies reveal stabilization of the A-LMS/DCF complex through the electrostatics and vander Waals interactions. The results from the pseudo-second order and Weber-Morrisfitting indicate a fastremoval rate; thus, column tests were undertaken. The single resistance mass transfer model, i.e. themass transfer (kfa) and diffusion coefficient (Deff), shows pore diffusional transport as a rate limiting step. Thefitting of thefixed bed column data with empirical models demonstrates the influences offlow rateand adsorbate inlet concentration on the breakthrough behavior. Pore surface diffusion modeling (PSDM)expresses mass transport under applied hydraulic loading rates, calculated breakthrough pointadsorption capacities: Cd2+(58.1)>Cr(VI)(54.1)>As(V)(50.9)>>Ni2+(42.9 mg g 1)), without performingthe experimentation on a full pilot-scale level, further confirms the high applicability of the A-LMS biobasedadsorbent.
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