期刊
ACS OMEGA
卷 5, 期 33, 页码 21032-21041出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.0c02598
关键词
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资金
- NSERC Canada
- Canada Research Chair
- Northern Ontario Heritage Fund Corporation
- Canada Foundation for Innovation
- 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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