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    Generation and Use of Lignin-g-AMPS in Extended DLVO Theory for Evaluating the Flocculation of Colloidal Particles

    Year: 2020

    Journal: ACS Omega, Volume 5, AUG 25, page 21032–21041

    Authors: Guo, Yanzhu; Kong, Fangong; Fatehi, Pedram

    Organizations: NSERC CanadaNatural Sciences and Engineering Research Council of Canada (NSERC); Canada Research ChairNatural Resources CanadaCanadian Forest ServiceCanada Research Chairs; Northern Ontario Heritage Fund Corporation; Canada Foundation for InnovationCanada Foundation for InnovationCGIAR; LiaoNing Revitalization Talents Program in China [XLYC1807232]; Youth Scientific and Technological Star Project of Dalian City in China [2017RQ036]

    In this work, Kraft lignin (ICL) was polymerized with 2-acrylamido-2-methylpropane sulfonic acid (AMPS) to generate an anionic water-soluble KL-g-AMPS polymer. The effects of reaction conditions on the charge density of polymers were evaluated to induce lignin-based polymers with the highest anionic charge density. The optimal process conditions were 2.5 mol/mol AMPS/lignin, 0.6 g/g solid/water ratio, 2.0 initiator/lignin weight ratio, 80 degrees C, 120 min, and pH 1.5, which yielded KL-g-AMPS with the anionic charge density of 4.28 mequiv/g and the grafting ratio of 285%. The chemical structure and compositions of the polymers were confirmed by H-1 NMR and elemental analysis. The flocculation performance of the polymer was evaluated in an aluminum oxide suspension, and its performance was compared with that of a homopolymer of AMPS produced under the same conditions. In addition, the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory was applied to study the flocculation mechanism of the polymers and alumina particles. The results revealed that electrostatic interaction was found to be the dominant force in this flocculation process.
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