Poly(chitosan-4-vinylphenol-acrylic acid) microgels as interfacial platforms for nickel(II) ions extraction and in-situ nanoparticle formation for pollutant reduction

초록

The discharge of industrial dyes and transition-metal cations into water creates toxic pollution and serious health risks, yet most existing materials remove either dyes or metal ions, not both. In this regard a new homogenous poly(chitosan-4-vinylphenol-acrylic acid) P(CVA) microgel has been designed to remove both dyes and metal cations. The P(CVA) system was synthesized using microwave radiation and employed as an adsorbent for the removal of nickel (II) (Ni(II)) ions from aqueous media under various conditions like different Ni(II) ions content, shaking period, pH of medium, and doses of P(CVA) and percentage removal (94%) and adsorption capacity (192 mg/g) were obtained. The adsorption performance of Ni(II) ions with P(CVA) was examined under several adsorption isotherms and kinetics of this extraction were evaluated using the intra-particle diffusion model (InPDM), elovich model (ElM), pseudo-first-order (Ps1stO), and pseudo-second-order (Ps2ndO). Furthermore, Ni nanoparticles (NPs) were prepared by applying in-situ reduction method on metal ions loaded system. The resulting Ni NPs decorated P(CVA) (Ni-P(CVA)) systems showed the catalytic reduce performance against various pollutants from aqueous medium like methyl orange (MeO), p-nitroaniline (PNiA), rhodamine-B (RhB), and chromium(VI) (CrVI) ions. The performance of Ni-P(CVA) was evaluated with pseudo-first-order rate constant (kap), resulting kap values were 1.105 min-1, 0.252 min-1, 1.016 min-1, and 1.547 min-1 for PNiA, CrVI, RhB, and MeO reduction respectively. Ni-P(CVA) system shows outstanding catalytic behavior for diverse toxins reduction.

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