Ft ir 4700 spectrophotometer

The morphological features of the synthesized hybrids (ZIF-8@bamboo, ZIF-8@modal and ZIF-8@cotton) were investigated under high-resolution scanning electron microscope (HRSEM Quanta FEG, 250 FEI Company). The untreated cellulosic fibers (bamboo, modal and cotton) were also examined as blank samples. Additionally, the elemental analysis and composition were measured by using the energy dispersive X-ray analyzer (EDX, AME-TEK analyzer) which attached with the microscope. X-ray diffractions for the untreated cellulosic fibers and the prepared hybrids (ZIF-8@bamboo, ZIF-8@modal and ZIF-8@cotton) were measured by using Philips X'Pert MPD diffractometer (λ = 1.5406 Å). The infrared spectra were measured for the untreated cellulosic fibers, the synthesized hybrids (ZIF-8@bamboo, ZIF-8@modal and ZIF-8@cotton) and the synthesized hybrids after adsorption of Chlorophyll-a. The attenuated total reflection–Fourier transform infrared spectroscopy (ATR-FTIR) were performed by using JASCO FT/IR-4700 spectrophotometer, (Japan). The absorbance spectra were collected in the wavenumber range of 400–4000 cm^–1 with 1.0 cm⁻¹ interval and repetitive scans of 64. The stability of MOFs within the treated fibers via analyzing surface area and metal content.

A portion (100 mg) of PPRE was dried in a vacuum for 1 h before its chemical characterization. The IR spectrum of PPRE was acquired from a disk diluted with KBr using an FT/IR 4700 spectrophotometer (JASCO Corp., Tokyo, Japan). 200 mg of KBr as a diluent was ground in a mortar and compressed to form a pellet for reference. Separately, 3 mg of PPRE was mixed with 200 mg of pre-ground KBr. The mixed powders were thoroughly ground in a mortar and compressed to form a sample pellet. The spectrum of the pellet was measured in the range of 400–4000 cm⁻¹ using 16 data acquisition mode. The thermogravimetric analysis (TG) and differential thermal analysis (DTA) curves of 8.0 mg of PPRE were measured using a TG-2000s instrument (BRUKER, Massachusetts, USA). α-Al₂O₃ powder (10 mg) in a Pt crucible was used as a reference. The temperature was increased from 25 to 1000 °C at a rate of 2 °C min⁻¹ and an air flow rate of 0.1 L min⁻¹. Elemental analysis of PPRE was performed using a 2400 Series II CHN analyzer (PerkinElmer, Massachusetts, USA). ¹H- and ¹³C-nuclear magnetic resonance (NMR) spectra of PPRE in C₂D₅OD were measured using a JNM-ECZ400S spectrometer at 400 MHz (JEOL, Tokyo, Japan). PPRE (10.5 mg) was dissolved in 1 mL of C₂D₅OD, and tetramethylsilane was used as an internal standard.

FTIR spectral analysis of pure ELX, blank SLNs and optimized ELX loaded SLNs (F2) were recorded by using an FTIR spectrometer (Jasco FTIR-4700 Spectrophotometer, Tokyo, Japan) with a maximum resolution of 0.4 cm⁻¹. Transparent pellets of samples were prepared by diluting with potassium bromide (1:10). The recorded FTIR spectra in the wavelength range of 400–4000 cm⁻¹ were interpreted using spectra manager IR software.

For ATR-FTIR analysis of inclusion complexes, physical mixtures and free IND thin adhesive tapes were applied and covered with a layer of each powder separately. The tape strips were irradiated in a Suntest CPS+ chamber. The subsequent degradation process was analysed on a Jasco FTIR-4700 spectrophotometer (JASCO, Tokyo, Japan) using the ATR ZnSe attachment. Before each measurement, the ATR crystal was cleaned with 2-propanol. The sample placed on the crystal was mounted on the ATR adapter, and the bridge of the adapter was lowered and blocked so that the tape with the sample was pressed against the crystal. The spectra of all the samples were recorded in this way.