Inca energy 350 x max

SEM images of activated silica gel (Si), 3-chloropropyl-bonded silica gel (Si-CPTS) and the Si-CPTS-AHAP adsorbent were obtained using a Zeiss LS-10 device equipped with an Inca Energy 350 X-Max (Oxford Instruments) spectrometer.
FT-IR spectra of the activated silica gel (Si), 3-chloropropyl bonded silica gel (Si-CPTS) and the Si-CPTS-AHAP adsorbent compounds were scanned using a PerkinElmer 100 FTIR spectrometer (ATR; 21 °C temperature and 1 atm pressure) in the range of 650–4000 cm⁻¹. The pH values of Cr(vi) metal ion solutions were measured using a Jenway 3010 digital pH meter. Amounts of metallic Cr(vi) cations remaining in solution were determined by ultraviolet-visible (UV) spectroscopy (Optizen brand 3220 model UV-vis).

FT-IR spectra were scanned on a Perkin Elmer spectrum 100 FTIR spectrometer (ATR). SEM images were obtained using a Zeiss LS-10 field emission SEM instrument equipped with an Inca Energy 350 X-Max (Oxford Instruments) spectrometer. Samples were sputter-coated with Au (60%) and Pd (40%) alloy using a Q150R (Quorum Technologies) instrument.