Abstract
The aim of the study was to investigate the influence of nanostructured montmorillonite surface modification by the cationic polyacrylamide and the lead(II) ions on the thermal and aggregation properties of solid particles covered with mixed adsorption layers. The effects of cationic groups content in the polymeric macromolecules, the order of individual adsorbates addition, and lead(II) ions concentration were determined. Using spectrophotometry, potentiometric titration, microelectrophoresis, turbidimetry, DCS (Differential Centrifugal Sedimentation) and thermal analysis methods, the adsorption, electrokinetic, aggregation properties, as well as the thermal stability of studied montmorillonite—CT PAM—Pb(II) systems were established. It was shown that applied polymeric substance (soil flocculant) causes accumulation of lead(II) ions, which are hazardous at very low concentrations. Nevertheless, the chemical nature of these interactions may limit the bioavailability of this heavy metal for plants.
Highlights
The macromolecular compound addition affects the stability and rheological properties of colloidal systems
Using the calibration curves the amount of adsorbed CT PAM or Pb(II) ions on the montmorillonite surface was calculated from the difference between the polymer or heavy metal ion concentration in the solution before and after its adsorption
The higher adsorbed amount was observed for cationic polyacrylamide with a Adsorbed amount [mg/m2]
Summary
The macromolecular compound addition affects the stability and rheological properties of colloidal systems. Due to the high strength of interparticle bonding, the polymer may control soil erosion and degradation (Singh et al 1996; Sojka et al 2007; Lentz et al 1992; Lee and Schlautma 2015). They interact mainly with the clay minerals present in the soil environment and affect their properties. The uptake of other compounds, i.e. nutrients, heavy metals, organic substances, changes In this way, the polymer presence may influence the accumulation of hazardous compounds including lead ions causing various organism diseases and disorders at very low concentrations (Pueyo et al 2004; Kabata-Pendias 2004; McBride 2003; Chaney et al 1998; Kumpiene et al 2007; Van Gestel 2008). According to the Regulation of the Minister of Health in Poland on 7.12.2017 (Journal of Laws of the Republic of Poland 2017), the permissible content of lead in drinking water is 0.01 ppm, whereas in the wastewaters 0.5 ppm
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