Synthesis, characterization and D. C. conductivity studies of polypyrrole/molybdenum trioxide composites

Chaluvaraju, B; Ganiger, Sangappa K.; Murugendrappa, M. V.

doi:10.1134/s1560090415010017

Cited by 19 publications

(5 citation statements)

References 15 publications

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“…SEM image of MoO 3 nanoparticles showed plate like orthorhombic structure with irregular surface morphology (Figure a). In MoO 3 /Ppy nanocomposite (Figure b), the MoO 3 nanoparticles were seen embedded inside the Ppy matrix . Figure c,d indicated the adsorption of Cd +2 and NB onto the surface of the composite.…”

Section: Resultsmentioning

confidence: 89%

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Synthesis of MoO₃/polypyrrole nanocomposite and its adsorptive properties toward cadmium(II) and nile blue from aqueous solution: Equilibrium isotherm and kinetics modeling

Siddiqui

Khan²,

Khan

2019

Env Prog and Sustain Energy

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Molybdenum trioxide/polypyrrole (MoO3/Ppy) nanocomposite was prepared via oxidative polymerization of pyrrole monomer with MoO3 nanoparticles. The adsorption of Cd+2 and nile blue (NB) onto the nanocomposite was investigated in terms of various process parameters. The characterization of MoO3/Ppy nanocomposite was carried out by Fourier transform‐infrared spectroscopy, X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, and energy dispersive X‐ray spectroscopy. Higher R2 (0.992–0.997 for Cd+2 and 0.997–0.998 for NB) and lower standard error of estimation values (1.04–1.82 for Cd+2 and 0.87–1.07 for NB) for Freundlich isotherm highlighted the multilayer adsorption onto heterogeneous nanocomposite surface. The higher Qm values at 323 K for Cd+2 (181 mg/g) and NB (189 mg/g) compared to many reported adsorbents proved the adsorptive superiority of MoO3/Ppy. The energy of adsorption (E) values from Dubinin–Radushkevich model was 1.26–1.38 and 1.36–1.44 kJ/mol for Cd+2 and NB, respectively, suggesting physical adsorption. Pseudo‐second order kinetic model governed the adsorption of Cd+2 and NB with intraparticle and liquid film diffusion controlling the mechanism. The negative ΔG values (8.4–9.4 kJ/mol) and positive ΔH values (2.5–6.1 kJ/mol) implied spontaneous and endothermic adsorption process. The positive ΔS values (0.036–0.048 kJ/mol/K) indicated increased randomness at MoO3/Ppy‐Cd+2 or NB interface. The MoO3/Ppy nanocomposite proved to be suitable and efficient adsorbent for sequestering of Cd+2 and NB from aqueous solution.

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Section: Resultsmentioning

confidence: 89%

“…It was inferred from Figure S12 that intraparticle diffusion mechanism was not solely controlling adsorption kinetics as the plot did not pass through the origin. The higher values of C i for Cd +2 (24)(25)(26)(27)(28) and NB (81-87) suggested greater effect of external surface on adsorption mechanism. 65…”

Section: Dubinin-radushkevich Isothermmentioning

confidence: 96%

Synthesis of MoO₃/polypyrrole nanocomposite and its adsorptive properties toward cadmium(II) and nile blue from aqueous solution: Equilibrium isotherm and kinetics modeling

Siddiqui

Khan²,

Khan

2019

Env Prog and Sustain Energy

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“…The precipitate that has been obtained is ltered, rinsed with double-distilled water, and dried in a hot air oven for eight hours. When the mixture is red in a mu e furnace, 2.25g of polypyrrole powder with a black color is produced [19].…”

Section: Synthesis Of Polypyrrolementioning

confidence: 99%

Structural and Humidity Sensing Properties of Polypyrrole composites containing Li2O and ZnO nanoparticles

Madival¹,

Prashantkumar²,

Nagaraja³

et al. 2023

Preprint

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We report the structural properties and humidity sensing abilities of polypyrrole (PPy) composites containing ZnO nanoparticles (NPs) and Li2O. The PPy was synthesized following chemical oxidation method. The PPy50-ZnO(NPs) 50- Li2O x (where x = 0,2,4,6,8 & 10) composites were prepared by physical mixing using ball-milling method. The as-prepared composites were subjected to XRD, FTIR and EDAX. The structural analysis using these tools hinted at the presence of Li2O in the composites and the effect of variation of Li2O in the composites is emphasized. The humidity sensing ability of pristine PPy and the composites has been investigated, at room temperature, by measuring the change in electrical resistance of the sample due to the variation in relative humidity from 11–97% RH. The response to humidity and recovery times were determined. The mechanism of humidity sensing in these composites was understood by Grotthus theory. Among all the composites, the composite x = 10 (PZL10) has exhibited very good response and recovery time and has the potential to be used as a low-cost and highly effective humidity sensor.

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“…Chaluvaraju et al carried out in-situ polymerizations of pyrrole (PPy) with molybdenum trioxide (MoO 3 ) in the presence of the oxidizing agent ammonium persulphate to synthesize PPy/molybdenum trioxide composites (PPy/MoO 3 ). 24 Hybrid thin films of PPy/MoO 3 were synthesized and investigated for their volatile organic compounds and gas-sensing properties by Matsubara et al 25 Sha et al synthesized a metal-organic framework/PPy nanocomposite based on MoO 3 for electrochemically enhancing the detection of the neurotransmitter dopamine. 26 Matsubara et al synthesized layered MoO 3 /PPy nano-hybrids by employing the concomitant ion-exchange reaction for the detection of volatile organic compounds.…”

Section: Introductionmentioning

confidence: 99%

“…carried out in-situ polymerizations of pyrrole (PPy) with molybdenum trioxide (MoO 3 ) in the presence of the oxidizing agent ammonium persulphate to synthesize PPy/molybdenum trioxide composites (PPy/MoO 3 ). 24 Hybrid thin films of PPy/MoO 3 were synthesized and investigated for their volatile organic compounds and gas-sensing properties by Matsubara et al . 25 Sha et al .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of polypyrrole/molybdenum oxide composite for ammonia vapour sensing at room temperature

Shariq

Husain

Khan

et al. 2021

Polymers and Polymer Composites

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In this study, polypyrrole (PPy) and polypyrrole/molybdenum oxide composite (PPy/MoO3) were synthesized by the chemical oxidative method in an aqueous medium, using anhydrous ferric chloride (FeCl3) as an oxidant. The successful preparation of materials was confirmed by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmittance electron microscopy (TEM). PPy and PPy/MoO3 were converted into pellets which were used as the sensor. A four-in-line probe device was used for studying DC electrical conductivity–based ammonia vapour–sensing properties at three different ammonia concentrations, that is, 1 M, 0.5 M and 0.1 M. The PPy/MoO3 sensor showed much-improved sensing performance than the PPy sensor in terms of % sensing response and reversibility. PPy/MoO3 sensor showed excellent selectivity for ammonia vapours against various VOCs. The % sensing response of PPy/MoO3 sensor towards ammonia was found to be 2.19, 2.50, 3.16, 3.87, 4.1, 5.15, 6.19, 6.55 and 7.77 times greater than ethanol, methanol, acetone, acetaldehyde, formaldehyde, toluene, benzene, chloroform and n-hexane, respectively. In the end, a sensing mechanism was also proposed, which is based on rapid adsorption–desorption of ammonia molecules on the PPy/MoO3 sensor’s surface.

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Synthesis, characterization and D. C. conductivity studies of polypyrrole/molybdenum trioxide composites

Cited by 19 publications

References 15 publications

Synthesis of MoO₃/polypyrrole nanocomposite and its adsorptive properties toward cadmium(II) and nile blue from aqueous solution: Equilibrium isotherm and kinetics modeling

Synthesis of MoO₃/polypyrrole nanocomposite and its adsorptive properties toward cadmium(II) and nile blue from aqueous solution: Equilibrium isotherm and kinetics modeling

Structural and Humidity Sensing Properties of Polypyrrole composites containing Li2O and ZnO nanoparticles

Synthesis and characterization of polypyrrole/molybdenum oxide composite for ammonia vapour sensing at room temperature

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Synthesis, characterization and D. C. conductivity studies of polypyrrole/molybdenum trioxide composites

Cited by 19 publications

References 15 publications

Synthesis of MoO3/polypyrrole nanocomposite and its adsorptive properties toward cadmium(II) and nile blue from aqueous solution: Equilibrium isotherm and kinetics modeling

Synthesis of MoO3/polypyrrole nanocomposite and its adsorptive properties toward cadmium(II) and nile blue from aqueous solution: Equilibrium isotherm and kinetics modeling

Structural and Humidity Sensing Properties of Polypyrrole composites containing Li2O and ZnO nanoparticles

Synthesis and characterization of polypyrrole/molybdenum oxide composite for ammonia vapour sensing at room temperature

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Synthesis of MoO₃/polypyrrole nanocomposite and its adsorptive properties toward cadmium(II) and nile blue from aqueous solution: Equilibrium isotherm and kinetics modeling

Synthesis of MoO₃/polypyrrole nanocomposite and its adsorptive properties toward cadmium(II) and nile blue from aqueous solution: Equilibrium isotherm and kinetics modeling