In situ diffuse reflectance infrared Fourier transform spectroscopy study of formaldehyde adsorption and reactions on nano γ-Fe2O3 films

Piezoelectric built-in electric field advancing TiO2 for highly efficient photocatalytic air purification

“…The attribution of adsorption peaks on the film is shown in Tables S1 and S2† (Tables S1, and S2†). 36–38 Similarly, S-TiO 2 /PDVF has also been applied to degrade toluene, which shows an excellent rate of mineralizing (Fig. S14†), further demonstrating the universality of the ferroelectric strategy in air purification.…”

Sub-ppm Formaldehyde Detection by n-n TiO2@SnO2 Nanocomposites

“…So, for HCHO oxidation, oxygen ions adsorbed on the surface of the nanocomposites play a key role in the generation of the surface formates. According to the results of the in situ DRIFT analysis and literature review [67,68,69,70,75,76] we propose a reaction mechanism as depicted in (9)–(12):HCHO(gas)→HCHO(ads)…”

Elucidating the Strain–Vacancy–Activity Relationship on Structurally Deformed Co@CoO Nanosheets for Aqueous Phase Reforming of Formaldehyde

“…From the Fourier transform infrared (FTIR) spectra of the Co@CoO-T catalysts recovered and dried after the HCHO reforming reactions (Figure 7a), we observe absorption bands at 961 and 1080 cm −1 , which are assigned to the stretching vibration of v s (CO) and bending vibration of δ(CH) of adsorbed HCHO, respectively. [42,44] Additionally, the band at 1177 cm −1 corresponds to the vibrations of methylene glycol, which forms upon the hydration of HCHO in the aqueous solution: HCHO + H 2 O → HCHO + (HO) + (H) → HOHCHOH. [39,45] In sharp contrast to the weak HCHO signals on pristine CoO, much stronger absorption peaks were observed on Co NPs, Co/CoO, and Co@CoO, suggesting that both Co 0 and the Co-CoO interfaces are active sites for HCHO.…”