Electrokinetic and rheological behaviors of sepiolite suspensions in the presence of poly(acrylic acid sodium salt)s, polyacrylamides, and poly(ethylene glycol)s of different molecular weights

Abstract

The effects of the molecular weights and concentrations of three polymers, poly(acrylic acid sodium salt) (NaPA), polyacrylamide (PAA), and poly(ethylene glycol) (PEG), on the electrokinetic and rheological properties of sepiolite suspensions were investigated. The z-potential values of the sepiolite suspensions were measured at different pH values, and the isoelectric point of sepiolite was determined to be 3.27. The anionic NaPA polymers were much effective in reducing the z-potential values of sepiolite than the nonionic polymers PAA and PEG. PAA and PEG of higher molecular weights caused a significant increase in the z-potentials of the sepiolite suspensions as their concentrations and molecular weights increased. The suspensions exhibited Bingham flow behavior. The reason for the increase in the plastic viscosity values of the sepiolite/NaPA suspensions was the increase in the polymer concentration in the suspensions; on the other hand, for the sepiolite/PAA or PEG suspensions, the reasons were the increase in the polymer concentration in the suspensions and the sepiolite-polymer interactions.

Methylene Blue Adsorption Study on Microcline Particles in the Function of Particle Size Range and Temperature

“…According to Awala and El Jamal [16], investigation of pH effect on methylene blue adsorption on feldspar, the optimal pH range is from 4 to 8. The sorption studies were performed without pH adjustment [14]. At higher pH values in suspension, the adsorption efficiency is slightly increased, but these pH values are rarely present in the environment, with the exception of the specific contaminated area [16,25].…”

“…Clays and clay minerals as adsorbent materials are potential candidates for the removal of various pollutants from water [14,15]. Awala and El Jamal [16] studied the adsorption surface of feldspar and the adsorption of dyes on these surfaces.…”

Applying zeta potential measurements to characterize the adsorption on montmorillonite of organic cations as monomers, micelles, or polymers

“…The effect of heavy metals on n has also been investigated to develop a model for the adsorption of heavy metals on magnetite [26]. More recently, n measurements have been applied to study the adsorption of organic cations and polycations on clay [27][28][29][30][31][32][33][34]. In many cases, the adsorption of the organic cation exceeded the clay's CEC and the expected charge reversal was verified by n measurements [27,30,34].…”

Preparation and characterization of urea-formaldehyde resin/reactive kaolinite composites

“…Many new materials with excellent properties such as high strain, high conductivity, and high water absorption have been successfully prepared (Ammala, Hill, Lawrence, & Tran, 2007;Chen et al, 2006;Podsiadlo et al, 2007;Ş en, 2010;Tunc & Duman, 2010;Tunc, Duman, & Uysal, 2008;Villanueva, Cabedo, Lagaron, & Gimenez, 2010;Yoon, Hunter, & Paul, 2003;Zhang et al, 2014). However, some drawbacks, including weight increase, brittleness, and opacity, are also encountered (Fischer, 2003;Gorrasi, Tortora, Vittoria, Galli, & Chiellini, 2002;Varlot, Reynaud, Kloppfer, Vigier, & Varlet, 2001).…”