The Role of Fluorine in F-La/TiO2 Photocatalysts on Photocatalytic Decomposition of Methanol-Water Solution

Edelmannová, Miroslava; Dubnová, Lada; Reli, Martin; Meinhardová, Vendula; Huo, Pengwei; Štangar, Urška Lavrenčić; Čapek, Libor; Kočí, Kamila

doi:10.3390/ma12182867

Cited by 12 publications

(4 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where A is a constant of proportionality depending on the material, hυ is the photon energy, and n is a constant that depends on the nature of the transition (2 for an indirect allowed transition and 1/2 for a direct allowed transition). e sample is found to depict an indirect optical band gap, and the extrapolation of the (αh]) 0.5 vs. h] slope (inset of Figure 4) to the zero value of (αh]) 0.5 gives an indirect optical band gap energy of 3.82 eV, affirming the semiconductor behavior of the sample [27,28]. Table 2: e equations and their plot parameters of kinetic models.…”

Section: Optical Studymentioning

confidence: 63%

Photocatalytic Degradation of Methylene Blue from Aqueous Medium onto Perlite-Based Geopolymer

Saufi

Alouani

Alehyen

et al. 2020

International Journal of Chemical Engineering

View full text Add to dashboard Cite

In this work, geopolymer synthesized with perlite and an alkaline activator medium was evaluated as a new adsorbent and photocatalyst for degradation of methylene blue (MB) dye from an aqueous medium. The functional group, the structure, and the morphology of the raw and the synthesized materials were characterized using FT-IR, XRD, and SEM analysis. The degradation of MB in the contaminated solution was examined using the spectrophotometric technique. Several analysis methods revealed the formation of the aluminosilicate gel after the geopolymerization reaction. The kinetics data with UV and without UV irradiations were well fitted with the pseudo-second-order equation. The results indicated that the degradation efficiency of cationic dye by perlite-based geopolymer without and with UV was up to 88.94% and 97.87% in 4 hours, respectively. The degradation efficiencies of methylene blue are in the following order: perlite-based geopolymer under UV irradiations is greater than perlite-based geopolymer without UV irradiations that is larger than UV irradiations. The overall experimental results suggested that the new elaborated material with synergetic adsorption and photocatalytic activities has a great potential for the treatment of water contaminated by hazardous substances.

show abstract

Section: Optical Studymentioning

confidence: 63%

Photocatalytic Degradation of Methylene Blue from Aqueous Medium onto Perlite-Based Geopolymer

Saufi

Alouani

Alehyen

et al. 2020

International Journal of Chemical Engineering

View full text Add to dashboard Cite

show abstract

“…On the other hand, methanol is one of the most popular solvents used in industry and its release to the environment is hazardous. One of the methods of its disposal could be its use as a sacrificial reagent in photodecomposition of a mixture of water and methanol [36,37]. This reaction was used in our study for evaluation of the photocatalytic activity of carbon nitride.…”

Section: Introductionmentioning

confidence: 99%

Influence of High Temperature Synthesis on the Structure of Graphitic Carbon Nitride and Its Hydrogen Generation Ability

Alwin

Kočí

Wojcieszak³

et al. 2020

Materials

Self Cite

View full text Add to dashboard Cite

Graphitic carbon nitride (g-C3N4) was obtained by thermal polymerization of dicyandiamide, thiourea or melamine at high temperatures (550 and 600 °C), using different heating rates (2 or 10 °C min−1) and synthesis times (0 or 4 h). The effects of the synthesis conditions and type of the precursor on the efficiency of g-C3N4 were studied. The most efficient was the synthesis from dicyandiamide, 53%, while the efficiency in the process of synthesis from melamine and thiourea were much smaller, 26% and 11%, respectively. On the basis of the results provided by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), infrared spectroscopy (FTIR), ultraviolet–visible spectroscopy (UV–vis), thermogravimetric analysis (TGA), elemental analysis (EA), the best precursor and the optimum conditions of synthesis of g-C3N4 were identified to get the product of the most stable structure, the highest degree of ordering and condensation of structure and finally the highest photocatalytic activity. It was found that as the proton concentration decreased and the degree of condensation increased, the hydrogen yields during the photocatalytic decomposition of water–methanol solution were significantly enhanced. The generation of hydrogen was 1200 µmol g−1 and the selectivity towards hydrogen of more than 98%.

show abstract

“…The inset shows that only a weak peak at 855.9 eV was observed in the Ni 2P 3/2 spectrum of Ni 2+ ion [11] due to its low doping. As shown in Figure 4b, the peaks at 458.6 eV and 464.4 eV were indexed to Ti 2P 3/2 and Ti 2P 1/2 peaks, respectively, indicating the presence of Ti 4+ state on the nanostructure surface [51]. In Figure 4c, the Si 2p peak at 102.8 eV exhibited a negative shift compared to the Si 2p peak of silica gel (103.3 eV), indicating the formation of Si-O-Ti bonds in the nanostructure and consequently confirming a successful doping of Si in TiO 2 lattice [52].…”

Section: Resultsmentioning

confidence: 97%

Ni/Si-Codoped TiO2 Nanostructure Photoanode for Enhanced Photoelectrochemical Water Splitting

Ding

2019

Materials

View full text Add to dashboard Cite

We synthesized Ni/Si-codoped TiO2 nanostructures for photoelectrochemical (PEC) water splitting, by electrochemical anodization of Ti-1Ni-5Si alloy foils in ethylene glycol/glycerol solutions containing a small amount of water. The effects of annealing temperature on PEC properties of Ni/Si-codoped TiO2 photoanode were investigated. We found that the Ni/Si-codoped TiO2 photoanode annealed at 700 °C had an anatase-rutile mixed phase and exhibited the highest photocurrent density of 1.15 mA/cm2 at 0 V (vs. Ag/AgCl), corresponding to a photoconversion efficiency of 0.70%, which was superior to Ni-doped and Si-doped TiO2. This improvement in PEC water splitting could be attributed to the extended light absorption, faster charge transfer, possibly lower charge recombination, and longer lifetime.

show abstract

The Role of Fluorine in F-La/TiO2 Photocatalysts on Photocatalytic Decomposition of Methanol-Water Solution

Cited by 12 publications

References 44 publications

Photocatalytic Degradation of Methylene Blue from Aqueous Medium onto Perlite-Based Geopolymer

Photocatalytic Degradation of Methylene Blue from Aqueous Medium onto Perlite-Based Geopolymer

Influence of High Temperature Synthesis on the Structure of Graphitic Carbon Nitride and Its Hydrogen Generation Ability

Ni/Si-Codoped TiO2 Nanostructure Photoanode for Enhanced Photoelectrochemical Water Splitting

Contact Info

Product

Resources

About