Polyaniline/chitosan composite: An eco-friendly polymer for enhanced removal of dyes from aqueous solution

Janaki, V.; Oh, Byung‐Taek; Shanthi, K.; Lee, Kui-Jae; Ramasamy, A. K.; Kamala‐Kannan, Seralathan

doi:10.1016/j.synthmet.2012.04.015

Cited by 212 publications

(84 citation statements)

References 40 publications

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Section: Xrd Analysissupporting

confidence: 90%

“…1850 clay. In Figure 2b it is possible to observe reflections at 2θ = 11.5 and 20.1 o , which is consistent with previous studies reporting the reflection pattern of chitosan, 43,45 and can be attributed to the existence of amorphous and crystalline regions, respectively.46,47 The XRD pattern of the PAni (Figure 2c) shows the main characteristic peaks of the PAni crystalline orthorhombic structure at 2θ = 11.4, 15.2, 20.5 and 24.0 o , corresponding respectively to the basal planes (001), (010), (100) and (110). …”

supporting

confidence: 91%

“…For PAni-chitosan sample (Figure 1b), FTIR spectrum exhibits typical absorption bands characteristic of chitosan (1656, 1595, 1427, 1379, 1155 and 1078 cm −1 ) 40,41 and PAni (peaks at around 1600, 1500, 1300 and 790 cm −1 ). 42,43 The bands associated with PAni remain unaltered in the FTIR spectra of the PAni-chitosan-clay and PAni-clay samples (Figures 1c and 1d, respectively). …”

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confidence: 98%

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Electrochromic Properties of Polyaniline-Based Hybrid Organic/Inorganic Materials

Silva¹,

Sarmento²,

Faez³

et al. 2016

Journal of the Brazilian Chemical Society

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Hybrid materials based on polyaniline (PAni) were obtained by in situ polymerization of aniline with chitosan and/or organically modified clay (nanomer I-24) in HCl. The samples were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM) and direct current (DC) electrical conductivity. Thin films of PAni, PAni-clay, PAni-chitosan and PAni-chitosan-clay were prepared by casting a solution of each sample in N-methyl-2-pyrrolidone (NMP) onto indium tin oxide (ITO)/glass electrodes and their electrochromic properties were investigated. It was observed color variation from transparent yellow in the reduced state (E = −0.2 V vs. Ag/AgCl), green in the intermediate state (E = 0.5 V) and dark blue in the oxidized state (E = 0.8 V) for all samples. The color changes of each material in function of the applied potential were tracked using the Commission Internationale de l'Eclairage (CIE) system of colorimetry, in which the color change was much more significant for PAni-clay film.Keywords: conjugated polymer, hybrid material, polyaniline, chitosan, organophilic clay IntroductionConjugated polymers have attracted the attention of academia and industries mainly because of their electrical, magnetic, and optical properties, which make them useful for applications in organic optoelectronic devices. Currently, the development of new hybrid materials based on conjugated polymers have afforded materials with excellent characteristics for application in organic light emitting diodes (OLEDs), 1,2 organic field effect transistors (OFETs), 3 organic solar cells (OSCs), 4 and electrochromic devices (ECDs). [5][6][7] Electrochromic materials based on conjugated polymers show many interesting properties such as multicolor, fast switching speed, flexibility and easy to optimize their properties through molecular tailoring. 8,9 Among the organic polymeric electrochromic materials, polyaniline (PAni) has been widely studied due to many advantageous properties including high optical contrast (∆%T), environmental stability, easy synthesis, as well as comparatively low cost.8 Furthermore, the high pseudocapacitance arising from the versatile redox reactions and its corresponding color changes make PAni promising candidate for electrochemical capacitors 10,11 and ECDs. 12,13 However, the difficulties in processing of PAni into films due to its very low solubility in most of the available solvents and the relatively poor mechanical properties decrease its performances and utilities in such applications.Despite PAni can be synthesized by chemical 14 or electrochemical 15 polymerization methods described in the literature, PAni films with good mechanical properties and adherence to a surface are not usually achieved from the conventional chemical methods of synthesis, which yield PAni as an insoluble and infusible bulky powder. 16 In order to increase the processability and mechanical properties of PAni, significant efforts have been done in preparation of blends based on PA...

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Section: Xrd Analysissupporting

confidence: 90%

supporting

confidence: 91%

mentioning

confidence: 98%

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Electrochromic Properties of Polyaniline-Based Hybrid Organic/Inorganic Materials

Silva¹,

Sarmento²,

Faez³

et al. 2016

Journal of the Brazilian Chemical Society

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“…The poly pyrrole/agro waste (PPy/agro waste) composites were synthesized by soaking the agro wastes in monomer pyrrole solution (0.2 M) for 12 h at room temperature followed by the slow addition of chemical oxidants 0.5 M FeCl 3 at room temperature for 4 h. The PPy/agro waste composites were filtered and then washed with distilled water [16].…”

Section: Methodsmentioning

confidence: 99%

“…To this, about 0.01 M of aniline dissolved in 1 M HCl was added and stirred for 15 min to form a homogenous solution. 4.4 g of ammonium peroxydisulfate (NH 4 S 2 O 8 ) solution in 1 M HCl was dropped into the above solution with constant stirring at 5ºC [16].…”

Section: Methodsmentioning

confidence: 99%