IR-analysis of H-bonded H2O on the pure TiO2 surface

aWe present a study of the reactions of the meteoritic mineral schreibersite (Fe,Ni) 3 P, focusing primarily on surface chemistry and prebiotic phosphorylation. In this work, a synthetic analogue of the mineral was synthesized by mixing stoichiometric proportions of elemental iron, nickel and phosphorus and heating in a tube furnace at 820 1C for approximately 235 hours under argon or under vacuum, a modification of the method of Skála and Drábek (2002). Once synthesized, the schreibersite was characterized to confirm the identity of the product as well as to elucidate the oxidation processes affecting the surface. In addition to characterization of the solid product, this schreibersite was reacted with water or with organic solutes in a choline chloride-urea deep eutectic mixture, to constrain potential prebiotic products. Major inorganic solutes produced by reaction of water include orthophosphate, phosphite, pyrophosphate and hypophosphate consistent with prior work on Fe 3 P corrosion. Additionally, schreibersite corrodes in water and dries down to form a deep eutectic solution, generating phosphorylated products, in this case phosphocholine, using this synthesized schreibersite.

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“…with PQO stretching frequencies and P-O-H bending modes on surfaces, [33][34][35][36] suggesting oxidation of the schreibersite surface.…”

Section: View Article Onlinementioning

confidence: 98%

The evolution of the surface of the mineral schreibersite in prebiotic chemistry

Cruz

Qasim

Abbott-Lyon

et al. 2016

Phys. Chem. Chem. Phys.

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“…The intensive band of OH-group asymmetrical and symmetrical stretching vibrations at 3436 cm -1 and H-O-H deformation vibration at 1634 cm -1 could confirm the large amount of water molecules. However, the OH-group vibration bands became much weaker with the increase of calcination temperatures (Chen et al 2003;Bezrodna et al 2004;Watson et al 2004). bioresources.com Zhang et al (2017).…”

Section: Ftir Spectroscopy Analysis Of the Composite Catalystsmentioning

confidence: 99%

Preparation and Photocatalytic Activity of TiO2-Wrapped Cotton Nanofiber Composite Catalysts

Zhang

Wan

et al. 2017

BioRes

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A novel TiO2-wrapped nanofiber composite catalyst, which possessed a unique porous structure and mixed crystalline phase, was prepared by the combination of superficial sol-gel and post-calcination processes. By means of the superficial sol-gel process, TiO2 layers were deposited on the surface of each nanofiber-like cellulose fiber, and then the TiO2-wrapped nanofiber composite catalysts were calcined at different temperatures under a nitrogen atmosphere. With temperature increasing, the original cotton nanofiber composites were converted into porous carbon nanofiber catalysts wrapped by a TiO2 mixed crystalline phase, which was accompanied by a crystal transformation. The photocatalytic activity of the new catalysts was evaluated by the degradation of methylene blue (MB) under ultraviolet (UV) irradiation. The results demonstrated that the new catalysts had good photocatalytic ability, and the TNC-700 catalyst showed a superior photocatalytic ability compared with the other catalysts; the new catalysts had a unique porous structure, high specific surface area, and mixed crystalline phase. Additionally, the synergistic photocatalytic effect of the TiO2 and activated carbon nanofiber resulted in the efficient degradation of organic pollutants in water or air.

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“…1. The broad peaks ranging from 436 to 653 cm -1 were observed in all samples and assigned to the vibration of Ti-O and Ti-O-Ti group (Bezrodna et al 2004). Errant peaks were observed around 2350 cm -1 , which were due to the interference of CO 2 in the atmosphere (Smith 2011).…”

Section: Resultsmentioning

confidence: 87%

Synthesis of ammonium and sulfate ion-functionalized titanium dioxide for photocatalytic applications

Cheng

Miao

et al. 2017

Appl Nanosci

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Due to high band gap energy the optimum photocatalytic activities can only be achieved under UV light, thus limiting the practical application of TiO 2 . In this study, a method combining NH 4? /SO 4 2--functionalization technique and post-treatment was developed and successfully applied to synthesize photoactive TiO 2 samples which showed higher photocatalytic activity than the commercial P25 TiO 2 under visible light radiation. The results also showed that the addition of (NH 4 ) 2 SO 4 surface functionalization on TiO 2 increased the photocatalytic activity, which could be due to the combined effect of crystallinity and band gap energies. Moreover, the results showed that calcination temperature was inversely proportional to photocatalytic activity. The degradation efficiency for methylene blue under visible light was improved by *2 times from 10.7% for P25 nano Degussa TiO 2 to 20.2% for the synthesized sample. The band gap energies were also reduced from 3.7 to 3.4 eV (under UV-Vis direct transition mode) indicating a red shift towards higher wavelength.

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IR-analysis of H-bonded H2O on the pure TiO2 surface

Cited by 295 publications

References 21 publications

The evolution of the surface of the mineral schreibersite in prebiotic chemistry

The evolution of the surface of the mineral schreibersite in prebiotic chemistry

Preparation and Photocatalytic Activity of TiO2-Wrapped Cotton Nanofiber Composite Catalysts

Synthesis of ammonium and sulfate ion-functionalized titanium dioxide for photocatalytic applications

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