Irtracer 100 fourier transform infrared spectrophotometer ftir

All reagents, solvents, and corresponding substituted amines were commercially obtained from suppliers and were used as received without any further purification. Thin layer chromatography (TLC) analysis of crude reaction mixtures or pure samples was performed using aluminum-based Merck KGaA (silica gel 60 F254) TLC plates and visualized under UV light (254 nm). Column chromatography was carried out on a glass column by using the wet-packed method with silica gel 60 (Merck (Darmstadt, Germany), 63–200 µm particle-sized, 60–230 mesh). ¹H and ¹³C NMR spectra were recorded at 500 MHz and 125 MHz on a Varian^UNITY INOVA spectrometer in CDCl₃ as solvent, respectively. Chemical shifts (δ) are reported in ppm. Coupling constants (J) are reported in Hz. IR spectra were obtained from molecules in neat form with a Quest ATR (Attenuated Total Reflectance) accessory with a diamond crystal puck using a Shimadzu IRTracer-100 Fourier Transform Infrared Spectrophotometer (FTIR). High-resolution mass spectra (HRMS) were obtained with a Waters SYNAPT G1 MS using an electrospray ionization technique.

The Pb²⁺ concentration was measured using Shimadzu AA-7000 AAS (Shimadzu, Japan), and the pH of the solution was determined by Thermo Scientific Orion Star A211 pH meter (Thermo Fisher, USA). The surface morphology and element composition of BS were imaged using Hitachi S-3400N scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) spectroscopy (Horiba, Japan). The functional groups on BS surfaces were recorded by the IRTracer-100 Fourier Transform Infrared Spectrophotometer (FT-IR) (Shimadzu, Japan). The composition and structure of the atoms or molecules inside OECSBC BS of ECH were characterised by XRD with PANalytical X’Pert PRO series X-ray (powder) diffractometer (PANalytical, the Netherlands). The specific surfaces area and pore size of the BS were analysed by Brunauer-Emmett-Teller (BET) surface analyser (TriStar II 3020 2.00). The data and figures of experiments were analysed by OriginPro 2019.