N and F Codoped TiO2 Thin Films on Stainless Steel for Photoelectrocatalytic Removal of Cyanide Ions in Aqueous Solutions

Castellanos-Leal, Edgar Leonardo; Acevedo–Peña, Próspero; Güiza-Argüello, Viviana; Córdoba-Tuta, Elcy María

doi:10.1590/1980-5373-mr-2016-0214

Cited by 15 publications

(8 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…S1), shows the FTIR spectra of the commercial sample TiO 2 , where can be observed a band below 500 cm −1 , that corresponds to Ti-O-Ti bonding. The spectra are similar to the found in the literature for pure TiO 2 (anatase) (Jiang et al 2013;Castellanos-Leal et al 2017). Figure 4 shows the results obtained by scanning electron microscopy (SEM), where can be observed the surface morphology of the photocatalysts.…”

Section: Characterization Of Photocatalystssupporting

confidence: 83%

Peruíbe black mud based catalysts for the removal of organic pollutants in water

Lourenço

Boto

Carvalho

et al. 2020

J. Sediment. Environ.

View full text Add to dashboard Cite

Peruíbe black mud (BM) is a natural clay found on the coast of São Paulo state of Brazil; in this study, it was used as an eco-friendly catalyst for environmental remediation. For this purpose, the removal of two organic pollutants [phenol and methylene blue (MB) dye] in water was studied using catalysts based on BM (calcined, and also doped with TiO 2). The catalytic reactions were studied under the following conditions: adsorption, heterogeneous-photocatalysis (UV light), and photo-Fenton (UV light + traces of H 2 O 2). The catalysts were characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, scanning electron microscopy, infrared spectroscopy, and adsorption-desorption of N 2. The characterization indicated that the calcined black mud (BM) is composed of muscovite and quartz (as majority components), and TiO 2 , among other minerals in trace amounts. The tests of removal of pollutants demonstrated that the BM has a notable photocatalytic activity to degrade the pollutants, the mixture of BM with small quantities of TiO 2 increased its photocatalytic activity; there was a kind of synergy between the BM and TiO 2 that was clearly observed in photo-Fenton reaction. The best way to remove phenol with the BM photocatalysts was by heterogeneous-photocatalysis and photo-Fenton reactions; while the best way for removing MB was by adsorption. In the photo-Fenton process, BM/TiO 2 mixture was better than the commercial catalyst (TiO 2). The catalytic tests, in general, demonstrated that the BM based catalysts could be used to remove organic pollutants in water to remediate polluted water, and consequently assist towards a better quality of the sedimentary environment. Keywords Black mud • Heterogeneous-photocatalysis • Photo-Fenton • Organic compounds • TiO 2 Abbreviations AOP Advanced oxidative processes BM Black mud CB Conduction band FTIR Fourier Transform infrared spectroscopy JCPDS Joint Committee on Powder Diffraction Standards MB Methylene blue Ph Phenol PCZ Point of zero charge VB Valence band XRD X-ray diffraction SEM Scanning electron microscopy List of symbols E Photon energy (eV) E bg Band gap energy (eV) h Planck's constant T Temperature (°C) UV radiation Wavelength (nm) Watt Power (W) Volt Electromotive force (V) (X%) Efficiency (X%) in the photodegradation (%) v Photon frequency (cm −1) Communicated by M. V. Alves Martins

show abstract

Section: Characterization Of Photocatalystssupporting

confidence: 83%

Peruíbe black mud based catalysts for the removal of organic pollutants in water

Lourenço

Boto

Carvalho

et al. 2020

J. Sediment. Environ.

View full text Add to dashboard Cite

show abstract

“…This Raman band shift observed can be associated to the presence of structural defects in the TiO 2 lattice [57] or minor deviations from stoichiometry of the TiO 2 films [58]. Moreover, the smooth aspect of the TiO 2 thin film spectra has been reported before [57,58], and detected especially for the films synthesized with nitric and hydrochloric acids. (Figure 4b).…”

Section: Structural Characterizationmentioning

confidence: 65%

“…The Raman bands associated to anatase can be assigned to 155 cm −1 (Eg), 205 cm −1 (Eg), 397 cm −1 (B1g), 510 cm −1 (B1g + A1g), and 636 cm −1 (Eg) for anatase [54][55][56]. This Raman band shift observed can be associated to the presence of structural defects in the TiO2 lattice [57] or minor deviations from stoichiometry of the TiO2 films [58]. Moreover, the smooth aspect of the TiO2 thin film spectra has been reported before [57,58], and detected especially for the films synthesized with nitric and hydrochloric acids.…”

Section: Structural Characterizationmentioning

confidence: 90%

TiO2 Nanostructured Films for Electrochromic Paper Based-Devices

et al. 2020

View full text Add to dashboard Cite

Electrochromic titanium dioxide (TiO2) nanostructured films were grown on gold coated papers using a microwave-assisted hydrothermal method at low temperature (80 °C). Uniform nanostructured films fully covered the paper substrate, while maintaining its flexibility. Three acids, i.e., acetic, hydrochloric and nitric acids, were tested during syntheses, which determined the final structure of the produced films, and consequently their electrochromic behavior. The structural characteristics of nanostructured films were correlated with electrochemical response and reflectance modulation when immersed in 1 M LiClO4-PC (lithium perchlorate with propylene carbonate) electrolyte, nevertheless the material synthesized with nitric acid resulted in highly porous anatase films with enhanced electrochromic performance. The TiO2 films revealed a notable contrast behavior, reaching for the nitric-based film optical modulations of 57%, 9% and 22% between colored and bleached states, at 250, 550 and 850 nm, respectively in reflectance mode. High cycling stability was also obtained performing up to 1500 cycles without significant loss of the electrochromic behavior for the nitric acid material. The approach developed in this work proves the high stability and durability of such devices, together with the use of paper as substrate that aggregates the environmentally friendly, lightweight, flexibility and recyclability characters of the substrate to the microwave synthesis features, i.e., simplicity, celerity and enhanced efficiency/cost balance.

show abstract

“…Afterwards, scientists conducted systematic and detailed research on the doping modification of a TiO 2 photocatalyst with nonmetallic elements. Non-metals generally used for semiconductor doping are N [285][286][287][288][289][290], C [55,[291][292][293], S [101,292,[294][295][296][297][298][299], P [297,300,301], F [290,[302][303][304][305][306][307], Cl [308], I [309], B [310][311][312][313], and Si [314][315][316], among others.…”

Section: Non-metal Ion Dopingmentioning

confidence: 99%

Recent Advances and Applications of Semiconductor Photocatalytic Technology

et al. 2019

View full text Add to dashboard Cite

Along with the development of industry and the improvement of people’s living standards, peoples’ demand on resources has greatly increased, causing energy crises and environmental pollution. In recent years, photocatalytic technology has shown great potential as a low-cost, environmentally-friendly, and sustainable technology, and it has become a hot research topic. However, current photocatalytic technology cannot meet industrial requirements. The biggest challenge in the industrialization of photocatalyst technology is the development of an ideal photocatalyst, which should possess four features, including a high photocatalytic efficiency, a large specific surface area, a full utilization of sunlight, and recyclability. In this review, starting from the photocatalytic reaction mechanism and the preparation of the photocatalyst, we review the classification of current photocatalysts and the methods for improving photocatalytic performance; we also further discuss the potential industrial usage of photocatalytic technology. This review also aims to provide basic and comprehensive information on the industrialization of photocatalysis technology.

show abstract

N and F Codoped TiO2 Thin Films on Stainless Steel for Photoelectrocatalytic Removal of Cyanide Ions in Aqueous Solutions

Cited by 15 publications

References 41 publications

Peruíbe black mud based catalysts for the removal of organic pollutants in water

Peruíbe black mud based catalysts for the removal of organic pollutants in water

TiO2 Nanostructured Films for Electrochromic Paper Based-Devices

Recent Advances and Applications of Semiconductor Photocatalytic Technology

Contact Info

Product

Resources

About