Reduction of acidity and removal of metal ions from coal mining effluents using chitosan microspheres

Cr(VI) sorption behavior from aqueous solutions onto polymeric microcapsules containing a long-chain quaternary ammonium salt: Kinetics and thermodynamics analysis

“…Among them, many studies have used biopolymers (i.e., chitosan) [10], active carbon [11], zeolites [12], and graft copolymers [13]. In recent years, the use of polymeric microcapsules (MC) synthesized by an in situ radical polymerization method has attracted the attention of some researchers with the aim of applying them to the removal and recovery of heavy metals from aqueous solutions [14][15][16][17][18].…”

Determination of metals by total reflection X-ray fluorescence and evaluation of toxicity of a river impacted by coal mining in the south of Brazil

“…It is currently a global problem. All over the world, studies have been conducted in order to remediate or to monitor effluents contaminated with AMD [1][2][3][4][5][6]. Acid water loaded with toxic heavy metals is generated by the weathering of sulfide minerals (such as pyrite, FeS).…”

Biosorption of U(VI) from aqueous systems by malt spent rootlets. Kinetic, equilibrium and speciation studies

“…The error bars indicate the standard deviation estimated from triplicate experiments. MSR were able to remove a significant amount of uranium ions under strong acidic conditions, as low as pH 1.5, which could be important for recovery of uranium and similar cations from acidic aquatic systems like mining effluents (Laus et al 2007). At low pH values, most functional groups present on MSR are protonated and undissociated, having positive (-NH 3 ? )…”