The nanocomposites were studied under PXRD, N2 sorption, DRS spectra, FTIR, XPS, NMR, HRTEM and PL to evaluate structural, morphological, optical properties and also the mesoporosity nature of the samples.
During sorption, Raman spectra were acquired temporally and spatially resolved across the PCL drop, allowing the evaluation of the PCL/CO2 mutual diffusivity, of the CO2 solubility in PCL, and the determination of temporal evolution of mass fraction profiles of carbon dioxide inside PCL.
Other than the 1120 cm−1 band, the 1080 and 1040 cm−1 bands were observed in sorption sample spectra, but with dampened peak intensity.
In non-linear least-squares fits of the sorption sample spectra, bond distance (R), backscatterer number (N), and the disorder or Debye-Waller term (σ2) were treated as adjustable parameters.
Likewise, precipitation of strontianite is readily observed by backscattering from carbon and strontium atoms at distances of ≈ 4 Å or less, but is not seen in the sorption sample spectra, even for samples in which reacting solutions were supersaturated with respect to strontianite (Figure 2a).
For strontium sorption samples, EXAFS spectra were collected on wiggler beamline IV-3 at the Stanford Synchrotron Radiation Laboratory SSRLL).
N2 sorption isotherms and XPS spectra indicated that the sulfur doping and the removal of acidic functional groups (such as sulphone groups and carboxyl groups) at high temperature strongly enhanced the catalytic activity of ACS-800.
Distinct differences and similarities were observed for ATR-FTIR spectra of sorption complexes formed at differing initial chemical conditions (Fig. 5).
Based on the UV-Vis spectrum, nitrogen sorption and IPCE analysis, the improved performance can be attributed to the enhanced scattering and increased active sites for dye loading.
