Quaternized-poly(N-vinylimidazole)/montmorillonite nanocomposite: Synthesis, characterization and electrokinetic properties

Dikişler

Chemical Engineering Communications

2016

Poly (N-vinyl imidazole) hydrogel (p-VIm) and its partially quaternized analogue (pVIm-Ar) were prepared and used for the removal of Orange II (OII). A Fourier transform infrared spectrophotometer, scanning electron microscope with an energy dispersive Xray spectrometer attached, thermogravimetric analyzer, zeta potential analyzer and drop shape analyzer were used for the characterization of the hydrogels. The influence of some experimental parameters, such as pH of the OII solution, contact time and initial OII concentration on the adsorption process, was examined, and the obtained data were used to calculate the isotherm and kinetic parameters. Adsorption processes of OII onto adsorbents were coherent with the Langmuir isotherm and pseudo-second-order kinetic models. The quaternized analogue exhibited remarkable adsorption performance in the pH range of 2-12, while the effective adsorption with p-VIm occurred only at pH 2.0.The maximum adsorption capacity values of adsorbents were determined as 2331 (for pVIm) and 1327 mg g −1 (for p-VIm-Ar) at pH 2.0 and 132 (for p-VIm) and 1357 mg g −1 (for p-VIm-Ar) at pH 6.0.

supporting

confidence: 88%

Removal of Orange II from Aqueous Solutions Using N-Vinyl Imidazole-based Hydrogels as Adsorbents

Dikişler

Chemical Engineering Communications

2016

International Journal of Chemistry and Technology

“…47,48 As shown in Figure 1b, the bands at 3106.57 cm −1 and 2953.40 cm −1 are corresponding to CH (ring) and CH (chain) stretching, respectively. 49 The bands appeared at 1497.02 cm −1 , 911.07 cm −1 and 816.24 cm −1 are correspond to C=N and C=C stretching of imidazole rings, respectively. The absorption band at 660.64 cm −1 can be ascribed to bending vibration.…”

Section: Ftir Analysismentioning

confidence: 98%

“…The weight loss in the 340-500°C temperature range is ascribed to PVI chain's decomposition. 49,54,55 In the sepiolite thermogram, the primary and first weight loss is near 100°C due to loss of zeolitic water that it is physically bonded to sepiolite in the structural channels and on the external surface. 56 Two of the four coordinated crystallization water molecules and the other two molecules of sepiolite are lost at about 300  C and at 520°C, respectively.…”

Section: Tga-dta Analysismentioning

confidence: 99%

Application of Sepiolite-Poly(vinylimidazole) composite for the removal of Cu(II) from aqueous solution: Isotherm and thermodynamics studies

Kara

Kılıç²,

Tekin³

et al. 2018

For removal of Cu(II) ions from aqueous solutions, a novel composite was prepared from 1-vinyl imidazole and sepiolite by the technique of in-situ polymerization. Adsorption of Cu(II) ions onto Sepiolite-Poly(vinylimidazole) composite prepared has been studied at 277338 K and the experimental data were analyzed using various isotherm models. The Langmuir and the Toth models procured the best fit to the experimental data of the adsorption among the two-parameter and three-parameter models, respectively. The adsorption equilibrium was reached in 3 h and the optimum pH for the adsorption was found to be 5. Adsorption isotherm modeling showed that the interaction between adsorbate and adsorbent is localized to monolayer adsorption. Maximum adsorption capacity (q m ) calculated from Langmuir isotherm was found to be 261.91 mg g −1 at 25 0 C. The calculated thermodynamic parameters indicated an endothermic adsorption process. The composite is thought to be a promising adsorbent for the removal of Cu(II) ions.

J. Polym. Sci. Part A: Polym. Chem.

“…Vinyl imidazole (VI), a derivative of imidazole exhibits electron donating properties with a loan pair of electrons on N atom (third position) as well as electron withdrawing properties due to unsaturated heterocyclic ring . Such mixed acidic and basic components in a polymer, poly(vinyl imidazole) (PVI) chain can impart acid‐base complexing properties with other molecules due to which polymers with imidazole derivatives along with its copolymers have attained a great interest in various fields …”

Section: Introductionmentioning

confidence: 99%

Poly(N‐vinyl imidazole) grafted silica nanofillers: Synthesis by RAFT polymerization and nanocomposites with polybenzimidazole

Kutcherlapati

Koyilapu

Jana

2017

In this report, we synthesized poly(N‐vinyl imidazole) (PNVI) grafted silica nanoparticles (SiNP) by using RAFT polymerization through grafting‐from approach to demonstrate that the self‐assembled structure of SiNP is the key diving force in improving physical properties of SiNP based nanocomposites. In a multistep synthetic process, well‐defined PNVI chains with tunable molecular weights and surface chain densities were grown from the RAFT agent anchored SiNP surface using N‐vinyl imidazole (NVI) as a monomer. Spectroscopic and thermal analysis confirmed surface grafting of PNVI on SiNP surface and the amount of grafted PNVI chins were also quantified. The mean diameter of the PNVI grafted SiNP (PNVI‐g‐SiNP) particles altered between 50 and 100 nm with the variation of PNVI chain lengths. The present approach is metal‐catalyst free, straight forward, and provides PNVI functionalized SiNP in a simple manner in comparison to the reported methods. Further, these PNVI‐g‐SiNP particles were used as a nanofiller to prepare nanocomposites with Poly(4,4′‐diphenylether‐5,5′‐bibenzimidazole) (OPBI). These nanocomposites displayed significantly higher mechanical, proton conductivity and less acid leaching properties than the pristine OPBI. The anisotropic self‐assembled ordered structure formation of nanofillers in the nanocomposites believed to be the driving force for the enhanced physical properties. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018, 56, 365–375