Fabrication of chitosan/Ag-nanoparticles/clay nanocomposites for catalytic control on oxidative polymerization of aniline

Azzam, E. M. S.; Solyman, Sanaa M.; Abd-Elaal, Ali A.

doi:10.1016/j.colsurfa.2016.06.015

Cited by 25 publications

(12 citation statements)

References 25 publications

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“…The thermal degradation kinetic parameters were determined for PANI/NCC/AgNPs nanocomposites using Horowitz–Metzger (HW) , Coats–Redfern (CR) , and Broido's (BR) methods which provide overall kinetic data. The HW relation used to evaluate the degradation kinetics is

\ln ([], \ln ((), W_{0} - W_{t}^{f}) / ((), W - W_{t}^{f})) = E_{a} normalθ / {RT}_{s}^{2}

where W 0 is the initial weight of the sample, W f t is the final weight of the sample, W is the weight remaining at a given temperature, T , E a is the activation energy, θ = T – T s , T s is the DTG peak temperature and T is the temperature corresponding to weight loss.…”

Section: Methodsmentioning

confidence: 99%

TGA investigation and morphological properties study of nanocrystalline cellulose/ag‐nanoparticles nanocomposites for catalytic control of oxidative polymerization of aniline

Pashaei

Hosseinzadeh

2018

Polymer Composites

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Polyaniline (PANI) and PANI/nanocrystalline cellulose (NCC)/silver nanoparticles (AgNPs) nanocomposites have been prepared via in situ oxidative polymerization of aniline in the presence of NCC and AgNPs in green mediate using sugar beet leaf extracts. A series of nanocomposites has been synthesized by varying the concentrations of AgNPs (0, 1, 4, and 8%) along with 2 wt% of NCC. The control on oxidative polymerization for aniline has been studied using fabricated nanocomposites as catalysts. Various analysis techniques, including UV-visible spectroscopy, X-ray diffraction, and transmission electron microscopy, were adopted to confirm the Nano-sized AgNPs. The characteristic peaks of PANI and its nanocomposites were observed in the Fourier transfer infrared spectra of the nanocomposites, indicating the incorporation of NCC and AgNPs in the nanocomposite structure. Using three mathematical models, namely, Horowitz-Metzger, Coats-Redfern, and Broido methods, thermal degradation and kinetic parameters of the composites have been calculated for each step of thermal degradation. POLYM. COMPOS., 40:E753-E764, 2019. SCHEME 2. Schematic representation for NCC/AgNPs and PANI/NCC/ AgNPs nanocomposites structure. FIG. 7. DTA curves of (a) 0%, (b) 4%, (c) 8% and (d) 10% PANI/NCC/ AgPNs E758 POLYMER COMPOSITES-2019

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\ln ([], \ln ((), W_{0} - W_{t}^{f}) / ((), W - W_{t}^{f})) = E_{a} normalθ / {RT}_{s}^{2}

Section: Methodsmentioning

confidence: 99%

TGA investigation and morphological properties study of nanocrystalline cellulose/ag‐nanoparticles nanocomposites for catalytic control of oxidative polymerization of aniline

Pashaei

Hosseinzadeh

2018

Polymer Composites

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“…The use or mixing of proper and commercially available materials with chitosan will improve its mechanical and chemical properties. Recently, different kind of materials such as clay mineral montmorillonite 38 – 40 , cellulose filter paper 18 , 41 , cellulose microfibers 4 , 17 , carbon nanotube 42 , or inorganic nanoparticles 2 , 43 – 45 , among others, have been used to improve the properties of chitosan for various applications. Among the various kinds of inorganic nanoparticles, TiO 2 nanoparticles are of intense interest due to their ability to advances mechanical properties of chitosan as well as to improve its antibacterial activity, good chemical stability, biocompatibility, photocatalytic activity, UV shielding ability, nontoxicity and low price 46 , 47 .…”

Section: Introductionmentioning

confidence: 99%

Chitosan-titanium oxide fibers supported zero-valent nanoparticles: Highly efficient and easily retrievable catalyst for the removal of organic pollutants

Ali

Khan

Kamal

et al. 2018

Sci Rep

132

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Different chitosan-titanium oxide (CS-TiO2-x, with x = TiO2 loadings of 1, 5, 10,15 and 20 wt%) nanocomposite fibers were prepared and kept separately in each salt solution of CuSO4, CoNO3, AgNO3 and NiSO4 to adsorb Cu2+, Co2+, Ag+, and Ni+ ions, respectively. The metal ions loaded onto CS-TiO2 fibers were reduced to their respective zero-valent metal nanoparticles (ZV-MNPs) like Cu0, Co0, Ag0 and Ni0 by treating with NaBH4. The CS-TiO2 fibers templated with various ZV-MNPs were characterized and investigated for their catalytic efficiency. Among all prepared ZV-MNPs, Cu0 nanoparticles templated on CS-TiO2-15 fibers exhibited high catalytic efficiency for the reduction of dyes (methyl orange (MO), congo red (CR), methylene blue (MB) and acridine orange (AO)) and nitrophenols (4-nitrohphenol (4-NP), 2-nitrophenol (2-NP), 3-nitrophenol (3-NP) and 2,6-dinitrophenol (2,6-DNP)). Besides the good catalytic activities of Cu/CS-TiO2-15 fibers, it could be easily recovered by simply pulling the fiber from the reaction medium.

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“…The peak around 1640 cm −1 was associated with OH stretching vibrations. The chitosan spectrum [Figure (b)] showed a broad band between 3000 and 3650 cm −1 , which was due to the stretching vibrations of OH groups; these were overlapped by the OH and NH stretching bands . The weak peaks at 2874 and 2921 cm −1 in the chitosan sample before biodiesel treatment were assigned to the symmetric and asymmetric stretching vibrations of CH 2 , respectively.…”

Section: Resultsmentioning

confidence: 95%

Improvement of glycerin removal from crude biodiesel through the application of a sulfonated polymeric adsorbent material

Alves

Cardoso

Guimarães

et al. 2017

J of Applied Polymer Sci

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The proposal of suitable processes for glycerin removal from crude biodiesel is an important task for making the overall biodiesel production process environmentally friendly and economically viable. In this article, we propose a dry purification process for biodiesel treatment with different polymeric materials [chitosan, cellulose acetate, poly(vinyl alcohol) (PVA), and sulfonated PVA]. Except for pure PVA, all of the proposed materials were able to reduce the free glycerin content of crude biodiesel from 0.03 wt % to values lower than 0.02 wt %. When the PVA was sulfonated, the glycerin removal increased from 12 to 82% compared that of pure PVA. The glycerin content in the biodiesel sample treated with sulfonated PVA was 0.0055 wt %. Mid‐IR spectrometric analysis showed that the sulfonation of PVA increased the band due to HOH stretching vibrations; this enabled greater hydrogen bonding between glycerol and the SO3 groups of the sulfonated adsorbent. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45330.

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Fabrication of chitosan/Ag-nanoparticles/clay nanocomposites for catalytic control on oxidative polymerization of aniline

Cited by 25 publications

References 25 publications

TGA investigation and morphological properties study of nanocrystalline cellulose/ag‐nanoparticles nanocomposites for catalytic control of oxidative polymerization of aniline

TGA investigation and morphological properties study of nanocrystalline cellulose/ag‐nanoparticles nanocomposites for catalytic control of oxidative polymerization of aniline

Chitosan-titanium oxide fibers supported zero-valent nanoparticles: Highly efficient and easily retrievable catalyst for the removal of organic pollutants

Improvement of glycerin removal from crude biodiesel through the application of a sulfonated polymeric adsorbent material

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