1 Naphthylamine

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Xiangping Hu - One of the best experts on this subject based on the ideXlab platform.

S M Ashraf - One of the best experts on this subject based on the ideXlab platform.

  • A short review on the synthesis, characterization, and application studies of poly(1-Naphthylamine): a seldom explored polyaniline derivative
    Colloid and Polymer Science, 2017
    Co-Authors: Sapana Jadoun, Anurakshee Verma, S M Ashraf, Ufana Riaz

    Poly(1-Naphthylamine) (PNA) has been one of the seldom explored polyaniline (PANI) derivatives in spite of its versatile electrochromic and optoelectronic properties. The present review summarizes, for the first time, synthesis, characterization, and application studies related to poly(1-Naphthylamine) as well as its copolymers, blends, and nanocomposites that have been carried out during the past two decades. Details about the chemical as well as electrochemical techniques used for the synthesis of this polymer are provided along with various procedures adopted to improve its processibility via formulation of copolymers, blends, and nanocomposites. Recent studies dealing with the potential applications of this polymer in the field of catalysis and coatings are also evaluated.

  • comparative studies of the photocatalytic and microwave assisted degradation of alizarin red using zno poly 1 Naphthylamine nanohybrids
    Journal of Molecular Liquids, 2016
    Co-Authors: Ufana Riaz, S M Ashraf, Vaibhav Budhiraja, Sadaf Aleem, Jyoti Kashyap

    Abstract Semiconductors such as ZnO and TiO2 have been extensively utilized in the photocatalytic degradation of dyes. However till date, no study has been reported to compare the catalytic efficiency of such organic–inorganic hybrids under UV light and microwave irradiation separately. The present work reports the synthesis of poly(1-Naphthylamine)/ZnO nanohybrids. The structure and morphology of the synthesized nanocomposites were characterized using FT-IR, UV, XRD, TEM and Cyclic voltammetry analyses. The dye degradation studies were done separately in a photochemical reactor and in laboratory microwave oven and the fragments were identified using LC–MS technique. Results showed that under microwave irradiation, the efficiency of ZnO/PNA as catalyst was higher as compared to UV irradiation. Higher extent of •OH radical generation was confirmed in microwave as compared to UV irradiation which was found to be responsible for the high rate of degradation of dye solution. A plausible degradation pathway was proposed.

  • Effect of pH on the microwave-assisted degradation of methyl orange using poly(1-Naphthylamine) nanotubes in the absence of UV–visible radiation
    Colloid and Polymer Science, 2015
    Co-Authors: Ufana Riaz, S M Ashraf, Munazah Farooq

    Microwave-assisted degradation of dyes is being extensively investigated for wastewater remediation. The present work reports, for the first time, degradation of methyl orange (MeO) in neutral, acidic, and basic media under microwave irradiation using semiconducting polymer [poly( 1 -Naphthylamine) (PNA)] nanotubes as catalyst in the absence of any light source. Degradation of the dye was followed spectrophotometrically and by total organic content (TOC) analysis. In the presence of poly( 1 -Naphthylamine), microwave irradiation in 15 min caused 70, 84, and 64 % degradation at 280 nm, while at 460 nm the degradation values were 80, 96 and 78 % of MO in neutral, acidic, and basic media, respectively. The degradation of the dye in the absence and presence of PNA catalyst and in acidic, basic, and neutral media followed first-order rate kinetics. Rate constant, k , values were found to be slightly dependent on the pH of the dye solutions. Liquid chromatography–mass spectroscopy analysis confirmed that dye degrades into smaller fragments of low molar masses.

  • catalytic degradation of orange g under microwave irradiation with a novel nanohybrid catalyst
    Journal of environmental chemical engineering, 2015
    Co-Authors: Ufana Riaz, S M Ashraf, Ankur Ruhela

    Abstract Catalytic degradation of pollutants under simultaneous exposure to ultraviolet–visible and microwave irradiations ubiquitously in presence of semiconductor photcatalysts like TiO 2 have been found highly efficient. TiO 2 being the most prominent photocatalyst in the above process, poses environmental and health hazard due to its nano form. We therefore aim to develop an efficient catalyst for dye degradation by replacing the semiconductor photocatalyst with a polymer semiconductor-based nanohybrid and also ruling out exposure to UV irradiation. Nanohybrid of poly(1-Naphthylamine) (PNA) with bentonite (Bent) clay was synthesized under microwave irradiation. Fourier transform infrared spectroscopy revealed emeraldine form of PNA in the nanohybrid while ultraviolet–visible spectra established the conducting state of bentonite/poly(1-Naphthylamine) nanohybrid. Formation of vertical chains of PNA in the interlayer space of bentonite clay was established by X-ray diffraction and transmission electron microscopy showed core–shell structure of the bentonite/poly(1-Naphthylamine) nanohybrid with size in the range of 140–200 nm. Cyclic voltammetry studies showed that the nanohybrid was more electroactive than pure bentonite. Surface charge and surface area of the catalyst was determined to explain its catalytic activity. The nanohybrid catalyzed dye degradation under microwave irradiation at 30 °C and showed 2.0–2.7 times higher catalytic efficiency as compared to pure bentonite. Liquid chromatographic–mass spectroscopic results showed that dye was degraded rapidly into intermediates of low m/z values: 285, 143, 119, 113 and 60. The catalyst was usable to six cycles.

  • latent photocatalytic behavior of semi conducting poly 1 Naphthylamine nanotubes in the degradation of comassie brilliant blue rg 250
    Separation and Purification Technology, 2012
    Co-Authors: Ufana Riaz, S M Ashraf

    Abstract TiO 2 and ZnO have been extensively used as low price photocatalysts for the degradation of dyes. To enhance the photocatalytic activity of these inorganic oxides under the visible light irradiation, conducting polymers such as polyaniline (PANI) and its derivatives are generally used as photosensitizers. The present preliminary study explores, for the first time, the latent photocatalytic behavior of pure polymeric organic semiconductor – poly(1-Naphthylamine) (PNA) nanotubes in the degradation of Comassie Blue (CB) dye under solar irradiation. Pristine PNA has band gap energy of 2.11 eV which can facilitate the excitation of electrons from its valence band to conduction band under visible light irradiation. In order to enhance the e − /h + separation and to prevent their recombination, simultaneous ultrasonic irradiation was used. Ultrasonic irradiation was found to accelerate the photodegradation and mineralization of CB dye. Sonophotocatalysis and sonolysis exhibited pseudo first order rate kinetics which was found to be in agreement with Langmuir Hinshelwood equation. The mechanism of sonophotocatalytic degradation and tentative photodegradation pathways have been proposed.

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