Analysis of XPS spectra of Fe2+ and Fe3+ ions in oxide materials

Preparation of amino-Fe(III) functionalized mesoporous silica for synergistic adsorption of tetracycline and copper

“…6. The peak positions of Fe 2p 3/2 and Fe 2p 1/2 have been reported to be around 711 and 724 eV, respectively (Grosvenor et al, 2004;Yamashita and Hayes, 2008). After TC loading, the peak of Fe 2p 3/2 increased from 710.5 eV to 710.9 eV, indicating the interaction between Fe(III) and TC.…”

Electroreduction of Iron(III) Oxide Pellets to Iron in Alkaline Media: A Typical Shrinking-Core Reaction Process

“…[41] When the sintering temperature is higher than 1373 K (1100°C), the phase composition of Fe 2 O 3 pellets precursors transforms gradually during the pre-sintering process, as shown in Figure. [43] has intensively investigated Fe 2+ and Fe 3+ ions in oxide materials using XPS. Based on the previous work [43] and the XPS spectra presented in Figures 3(c) and (d), it is obvious that the pellets of iron oxides precursors sintered at 1473 K and 1573 K (1200°C and 1300°C) contain Fe 2 O 3 and Fe 3 O 4 phases, which may be responsible for the different appearances of the sintered pellets ( Figure 2(a)). Higher sintering temperature means higher energy cost, therefore, the pressed pellets should be sintered at the appropriate/optimum temperature to guarantee sufficient mechanical strength and appropriate porosity for electroreduction operations.…”

Quantitative analysis of Fe and Co in Co-substituted magnetite using XPS: The application of non-linear least squares fitting (NLLSF)

“…Most XPS studies of magnetite were focused on the determination of the Fe 2+ /Fe 3+ ratio [10,11] and the effects on the adsorption, reduction, or removal of heavy metals [12][13][14]. Few reports have examined the relative quantities of the substitution element and Fe in transition metalsubstituted magnetite, providing the motivation for the present study.…”