Preparation of an ionic liquid-based hydrogel with hyperbranched topology for efficient removal of Cr(VI)
Source abstract
Abstract
An imidazolium salt-based hydrogel with hyperbranched topology (hbGel-PEG-TTIm+Br 6 − ) was proposed for efficient adsorption towards anionic hexavalent chromium ions (Cr(VI)). For the purpose, a bromo-terminated A3 type monomer and a imidazole-terminated B3 type monomer were firstly synthesized via O-esterification and Michael addition, respectively. Then, hbGel-PEG-TTIm+Br 6 − was obtained by the one-pot step polymerization of “A3 + B3” approach via N-alkylation reaction. The chemical structure and morphology of the as-prepared hydrogel were confirmed by Fourier transform infrared and scanning electron microscope. The cross-linking network structure was calculated according to the Flory–Rehner equilibrium swelling equation. The effects of solution pH, adsorbent dosage, contact time and initial Cr(VI) concentration on the adsorption performance were also investigated, and the maximum adsorption capacity could reach ~ 238 mg g−1. In addition, the adsorption process of Cr(VI) on hbGel-PEG-TTIm+Br 6 − was well described by the pseudo-second-order kinetic model, and the adsorption equilibrium data fitted with Langmuir isotherm model better than Freundlich isotherm model. This novel hydrogel with hyperbranched topology can potentially be applied in the treatment of wastewater containing Cr(VI).
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Adsorption and biosorption for pollutant removal · Analytical chemistry methods development · Covalent Organic Framework Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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