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    Öğe
    Investigation of PAN:Hemp Stems Nanofibers Produced by Electrospinning Method
    (2022) Candan, İlhan; Gumgum, Hadice Budak; Erbastı, Ülker Yalçın; Kılıç, Hamdi Şükür; Gündoğdu, Yasemin
    In this study, the hemp stem (cannabis) nanofibers have been produced employing the electrospinning method by changing parameters including voltage, and deposition time. The nanosized particles of hemp stems have been mechanically produced by ball milling technique. The powder hemp stem obtained by ball-milling have been prepared in polyacrylonitrile (PAN) polymer with N, N-dimethylformamide (DMF) solution. The optical, morphological and chemical bonding properties of the obtained hemp nanofibers have been analysed employing Ultraviolet-Visible-Near infrared (UV-Vis-NIR) spectroscopy, Scanning Electron Microscopy (SEM) and Fourier Transform Infra-Red (FTIR) spectroscopy, respectively. The diameters of hemp stems nanofibers with PAN polymer have been obtained ranging from 30 to few hundreds of nanometre. Absorbance spectrum of PAN: Hemp stems have been plotted covering from UV to infrared region. Energy band gap value has been calculated as 3.5 eV using Tauc-plotting equations. PAN: Hemp stems has absorbed more photons in UV and visible regions than infrared region. In order to determine the thermal endurance of the produced hemp nanofibers, Thermogravimetric Analysis (TGA) has been carried out for temperatures up to 800 oC. TGA measurements has inferred that both PAN and Hemp stem nanofibers continue losing weight gradually after first sharp decrease at around 300 oC and almost completely disintegrate at 800 oC.
  • [ X ]
    Öğe
    Spectroscopic and Thermogravimetric Investigation of Cd(II) Dinonyldithiophosphate: Removal of Cadmium from Aqueous Solutions
    (Hindawi Ltd, 2015) Biricik, Nermin; Gumgum, Hadice Budak; Gumgum, Bahattin
    Dinonyldithiophosphoric acid (HDDTP) was synthesised from the reaction of phosphorus pentasulphide and nonyl alcohol. Dinonyldithiophosphate complex of cadmium [Cd(DDTP)(2)] was prepared by mixing solutions of Cd(II) with HDDTP in ethanol at room temperature. The acid and its complex were characterised by elemental analysis and spectroscopy. The thermal behaviour of Cd(DNDTP)(2) was investigated by thermogravimetric analysis. Removal of Cd(II) from aqueous media by HDDTP solution was also studied. The optimum conditions for removal of Cd(II) were investigated for effects of solvent, pH, contact time, concentration, and inorganic anions. Cd(II) was quantitatively removed from aqueous solutions at the pH range of 0.5 < pH < 6, under the conditions that the stoichiometric ratio of HDDTP/Cd(II) = 2/1. It can be stated that contact of the Cd(II) with HDDTP was sufficient for quantitative removing of cadmium from acidic aqueous solutions.