Electrochemical synthesis of nanostructure poly(3-aminobenzoic acid), polyaniline and their bilayers on 430SS and their corrosion protection performances

Heydari, Mohammad; Zebhi, Hamid; Farhadi, Khalil; Moghadam, Peyman Najafi

doi:10.1016/j.synthmet.2016.04.019

Cited by 13 publications

(2 citation statements)

References 28 publications

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“…Polyaniline (PANI), which is one of the conducting polymers, and its derivatives have attained great attention due to their good electron density, ease of preparation and excellent environmental stability [10][11][12]. Furthermore, PANI derivatives have shown good processability, resulting from their improved solubility [12,13]. However, there are few reports on the use of polyaniline (PANI) and its derivatives as metal-free HER electrocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Poly(3-aminobenzoic acid) Decorated with Cobalt Zeolitic Benzimidazolate Framework for Electrochemical Production of Clean Hydrogen

et al. 2020

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A novel composite of poly(3-aminobenzoic acid) (PABA) and a cobalt zeolitic benzimidazolate framework (CoZIF) has been studied for the production of hydrogen through the hydrogen evolution reaction (HER). The structural characteristics and successful synthesis of PABA, CoZIF and the PABA/CoZIF composite were confirmed and investigated using different techniques. Probing-ray diffraction for phase analysis revealed that the composite showed a decrease and shift in peak intensities, confirming the incorporation of CoZIF on the PABA backbone via in situ polymerization, with an improvement in the crystalline phase of the polymer. The thermal stability of PABA was enhanced upon composite formation. Both scanning electron microscopy and transmission electron microscopy showed that the composite had a rough surface, owing to an interaction between the CoZIF and the external surface of the PABA. The electrochemical hydrogen evolution reaction (HER) performance of the synthesized samples was evaluated using cyclic voltammetry and Tafel analysis. The composite possessed a Tafel slope value of 156 mV/dec and an α of 0.38, suggesting that the Volmer reaction coupled with either the Heyrovsky or Tafel reaction as the rate determining step. The fabricated composite showed high thermal stability and excellent tolerance as well as high electroactivity towards the HER, showing it to be a promising non-noble electrocatalyst to replace Pt-based catalysts for hydrogen generation.

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Section: Introductionmentioning

confidence: 99%

Poly(3-aminobenzoic acid) Decorated with Cobalt Zeolitic Benzimidazolate Framework for Electrochemical Production of Clean Hydrogen

et al. 2020

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“…SEM images were obtained under high vacuum conditions at 5 kV. The protonated/deprotonated degree and intrinsic oxidation states of membrane were investigated by UV–vis absorption spectra using a spectrophotometer (HACH DR6000) 32 . The membrane was previously dissolved in NMP, and the absorption spectrum from 260 to 860 nm was recorded.…”

Section: Methodsmentioning

confidence: 99%

Preparation of proton block and highly conductive AEM by creating PANI dominated and hydrophobicity ion channels for sulfuric acid enrichment

Xie

Ning

et al. 2021

Polymers for Advanced Techs

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Electrodialysis is widely used to separate and concentrate sulfuric acid from industrial wastewater. Nevertheless, owing to the proton leakage of anion‐exchange membrane (AEM), the concentration of recycled sulfuric acid is typically less than 20 wt.%. What is more, the restraining of proton leakage would sacrifice the conductivity of membrane, leading to the increasing of energy consumption (EC). In this work, a proton block and highly conductive polyaniline (PANI)/polyvinylidene fluoride (PVDF) membrane were prepared by creating PANI dominated and hydrophobicity ion channels through etching. The variations of solubility, structure, and electrical performance of membrane during etching process were investigated. As a result, the electrical performance of membrane, especially for the conductivity, was significantly improved owning to the formation of PANI dominated ion channels and spaces. Meanwhile, even the porosity and water content of etched membrane were improved, the anions were mainly migrated through molecular chains of PANI; the protons were still blocked by the hydrophobic pores. Further, the etched membranes with different porosities were used to enrich sulfuric acid (1 wt.%) through electrodialysis. As a result, the proton leakage was proved to be the major limitative factor of acid solution enrichment. By using the optimal etched membrane, concentrated acid (41 wt.%) was obtained with a less energy consume (EC), compared with commercial AEM.

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Sorption of Pt(IV) ions on poly(m-aminobenzoic acid) chelating polymer: Equilibrium, kinetic and thermodynamic studies

2020

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In this work, poly(m-aminobenzoic acid) (PABA) chelating polymer was synthesized and its sorption behaviors for Pt(IV) ions have been investigated. The PABA polymer was prepared by the reaction of m-aminobenzoic acid with ammonium peroxydisulfate. Fourier transform-infrared spectroscopy (FT-IR), thermal analysis (TG and DTA), field emission-scanning electron microscopy (FE-SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and surface porosity analytical methods were used in the characterization of the polymer. The FE-SEM images showed that the particles of the synthesized PABA polymer were about 2-10 μm. The PABA polymer is thermally stable up to 320 °C. The zero charge point of the polymer was found at pH 3.50. Batch adsorption experiments were used to examine the effects of pH, initial Pt(IV) concentration, contact time and temperature. The best adsorption values were obtained at pH 4, in which is above the zero charge point of the polymer. The equilibrium, kinetics and thermodynamics of Pt(IV) adsorption on the PABA polymer were examined. The Pt(IV) maximum adsorption capacity of the polymer is 2362 μg/g. The adsorption kinetic data fitted best to pseudo-second order kinetic model. The calculations with intra-particle diffusion and the Elovich models showed that the adsorption was controlled by intra-particle diffusion and chemisorption. The adsorption data fitted well to the Langmuir isotherm. It was found that the adsorption followed the pseudo-second-order kinetic model. In the thermodynamic calculations, the Gibbs free energies (ΔG°: (−10.98)-(−17.38) kJ/mol), the enthalpy (ΔH°:70.07 kJ/ mol) and the entropy (ΔS°: 215.3 kJ/mol) change values of the adsorption were calculated. The column adsorption-desorption and reusability studies of the PABA polymer were also performed. The results showed that Pt(IV) sorption on the PABA polymer is endothermic and chemical adsorption process which is governed by both ionic interaction and chelating mechanisms.

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Electrochemical synthesis of nanostructure poly(3-aminobenzoic acid), polyaniline and their bilayers on 430SS and their corrosion protection performances

Cited by 13 publications

References 28 publications

Poly(3-aminobenzoic acid) Decorated with Cobalt Zeolitic Benzimidazolate Framework for Electrochemical Production of Clean Hydrogen

Poly(3-aminobenzoic acid) Decorated with Cobalt Zeolitic Benzimidazolate Framework for Electrochemical Production of Clean Hydrogen

Preparation of proton block and highly conductive AEM by creating PANI dominated and hydrophobicity ion channels for sulfuric acid enrichment

Sorption of Pt(IV) ions on poly(m-aminobenzoic acid) chelating polymer: Equilibrium, kinetic and thermodynamic studies

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