Ft 8400 spectrometer

Zn (NO₃)₂.6H₂O (Merck, 98%) and 2, 6 pyridine dicarboxilic acid (Merck, 99%), and sodium dodecyl sulfate (Sigma, 99%) were prepared using analytical-grade chemicals without any purification. Crystallinity data of the synthesized Zn-MOF samples was investigated by X′- PERT PRO (Philips) X-ray diffractometer device. Brunauer–Emmett–Teller (BET) surface area of the Zn-MOF products was determined using N₂ adsorption/desorption isotherms (ASAP 2460, Micromeritics). The FTIR spectra of the Zn-MOF samples have been recorded between 4000 and 500 cm^_1 as KBr pellets on SHIMADZU FT 8400 Spectrometer. EDS analysis was carry out by XL30. The particle size distribution and morphology of the samples were examined by scanning electron microscopy (SEM, Hitachi S-4800). Thermogravimetric analysis (TGA, 851e-Mettler Toledo) was studied from room temperature to 800 °C with a heating rate of 10 °C min⁻¹ under an Argon atmosphere. TEM images were obtained by using a HITACHI H-7650 electron microscope with an accelerating voltage of 100 kV.

All the chemicals including PVA powder (Mw: 85,000–124,000, 96%, Merck), Cs powder (Mw: 500–1000, 99%, Aldrich), and acetic acid (99%, Aldrich) were used without further purification. The Cs/PVA composite nanofibers were characterized by a variety of techniques including scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), BET surface area, thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). For SEM analysis (Philips xl30), the fibrous samples were gold-sputtered with a thin layer of gold. The FTIR (SHIMADZU FT 8400 Spectrometer) was recorded on a spectrometer in the range of 500–4000 cm⁻¹ using the KBr disk. Nitrogen adsorption technique (Belsorp mini II) was applied to determine pore textural properties including the specific surface area, pore volume, and pore diameter. TGA (SCINCO thermal gravimeter S-15000) and DSC (STA449F3, Netzsch) were carried out at the heating rate of 5° C/min from room temperature to 800°C under a dry N₂ atmosphere.