Abstract
An evaluation of the chromium(VI) adsorption capacity of four magnetite sorbents coated with a polymer phase containing polymethacrylic acid or polyallyl-3-methylimidazolium is presented. Factors that influence the chromium(VI) removal such as solution pH and contact time were investigated in batch experiments and in stirred tank reactor mode. Affinity and rate constants increased with the molar ratio of the imidazolium. The highest adsorption was obtained at pH 2.0 due to the contribution of electrostatic interactions.
Highlights
Chromium(VI) is a highly toxic species; it is considered on the priority list of highly toxic pollutants by the Environmental Protection Agency of the United States (EPA), which has established 50 μg/L as the maximum permitted level for chromium(VI) [1].The main source of chromium(VI) is associated with anthropogenic activities such as electroplating, textile industries, and pigments
The synthesized sorbents were characterized by Fourier transform infrared spectroscopy (FTIR)
For the magnetite (Figure 2a), The synthesized sorbents were characterized by Fourier transform infrared spectroscopy (FTIR)
Summary
Chromium(VI) is a highly toxic species; it is considered on the priority list of highly toxic pollutants by the Environmental Protection Agency of the United States (EPA), which has established 50 μg/L as the maximum permitted level for chromium(VI) [1]. Magnetic materials have been considered useful because they can be modified to improve selectivity and adsorption. Have been considered useful because they can be modified to improve selectivity and adsorption processes [16], and they can be separated from the media by applying an external magnetic field, minimizing secondary [17,18]. Poly(ionic liquids) (PILs) have gained considerable attention in the past few years because these materials possess physical and chemical properties covering a wide range ofof applications. Yuan et al.etdescribed the synthesis of PIL-based core–shell nanoparticles using inorganic inorganic and cores organic coresuse for in their use in separation techniques [27],the combining unique IL and organic for their separation techniques [27], combining unique ILthe properties and properties and the small dimension of nanoparticles that amplifies the surface features, giving rise to the small dimension of nanoparticles that amplifies the surface features, giving rise to a new class of a new class of polymeric materials.
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