In situ ATR–FTIR studies on the competitive adsorption of arsenate and phosphate on ferrihydrite

Removal of arsenate by ferrihydrite via surface complexation and surface precipitation

“…2 was just based on pseudo equilibrium data. Similar kinetics had been reported earlier [28,29]. Thus the mechanism of interaction between As(V) and ferrihydrite was more than simple adsorption onto the surface of ferrihydrite.…”

Polymerization of silicate on TiO2 and its influence on arsenate adsorption: An ATR-FTIR study

“…With this technique, the monomeric, oligomeric, and polymeric silicate surface species can be distinguished based on the position of the Si O stretching bands [16,24,25]. Moreover, the molecular As(V) adsorption structures on metal oxides were also extensively studied with ATR-FTIR spectroscopy [26,27]. Therefore, the competitive effects of monomeric and polymeric silicate on As(V) adsorption can be investigated.…”

Mid-infrared spectroscopy and partial least-squares regression to estimate soil arsenic at a highly variable arsenic-contaminated site

“…The vibrational features (e.g. Fe-O, Al-O, Si-O and -OH) of soil minerals also contribute to the MIR spectra (Johnston and Aochi 1996;Cornell and Schwertmann 2003;Jia et al 2007;Carabante et al 2010). It is difficult to quantitatively interpret spectral information; however, using chemometrics approaches, particularly partial least-squares (PLS) regression, this problem has been overcome (Janik and Skjemstad 1995;Forouzangohar et al 2008).…”

“…Infrared spectroscopy has been used to evaluate the adsorption mechanisms of As on the surface of Fe/Al oxides and clay minerals in soils (Goldberg and Johnston 2001;Jia et al 2007;Carabante et al 2010). Goldberg and Johnston (2001) used attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy to determine the adsorption mechanism of arsenate on the surface of amorphous Fe and Al oxides.…”