Colloids and Surfaces A 538 (2018) 639–650 Contents lists available at ScienceDirect Colloids and Surfaces A journal homepage: www.elsevier.com/locate/colsurfa Mohan K.R. Konduri, Pedram Fatehi Chemical Engineering Department, Lakehead University, 955 Oliver Road, Thunder Bay, ON P7 B 5E1, Canada GR APHICAL A BSTRACT ARTICLE I NFO ABSTRACT Keywords: To generate eﬀective dispersants for kaolin suspensions, it is important to study how the properties of dis- Oxidized lignin persants aﬀect their performance in suspensions. In this work, kraft lignin was modiﬁed via oxidation with nitric Dispersion acid under varied conditions to produce oxidized lignin (OL) with diﬀerent charge densities and molecular Charge density weights. The eﬀects of anionic charge density and molecular weight of the lignin based products on the dis- Colloid persion and sedimentation of kaolin particles were studied fundamentally. The adsorption of OLs on particles as Polymer adsorption well as the changes in the zeta potential, relative turbidity, hydrodynamic diameter and sedimentation of par- Molecular weight ticles under static (non-stirring) and dynamic (stirring) conditions were systematically investigated. Dispersion studies suggested that both charge density and molecular weight had great impacts on the stability of kaolin particles. Sample OL8 with the charge density of −3.6 meq/g and molecular weight
Geoderma – Elsevier
Published: Feb 15, 2019
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