Role of chlorophyll in Spirulina on photocatalytic activity of CO 2 reduction under visible light over modified N-doped TiO 2 photocatalysts

Phongamwong, Thanaree; Chareonpanich, Metta; Limtrakul, Jumras

doi:10.1016/j.apcatb.2014.12.022

Cited by 84 publications

(42 citation statements)

References 81 publications

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“…To assess the state of N atoms in the 3%N‐doped TiO 2 nanorods array, high‐resolution XPS spectra of N 1s region were generated as shown in Figure . The peak at 399.8 eV could be attributed to the interstitial N atoms in the crystal lattice of TiO 2 in the Ti─O─N or Ti─N─O linkage forms as previously reported . These new linkages reduce the band gap energy, which is beneficially for the photocatalytic properties …”

Section: Resultssupporting

confidence: 63%

Effect of nitrogen doping on the photocatalytic activity and hydrophobic property of rutile TiO₂ nanorods array

Kongsong

Taleb

Masae

et al. 2018

Surface & Interface Analysis

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Pure titanium dioxide (TiO 2 ) and nitrogen (N)-doped TiO 2 nanorods array were prepared using polished Ti substrates and hydrothermal synthesis method. Prepared nanorods films were characterized by different techniques including X-ray diffractometer (XRD), field-emission scanning electron microscope, Fourier-transform infrared spectroscopy, and XPS. The photocatalytic activities of both prepared films were evaluated by their capacity to degrade methylene blue (MB) in solution, and an attempt to associate it with their surface wetting properties is achieved. The XRD results showed that the prepared TiO 2 is of rutile phase. Furthermore, the 3%N-doped TiO 2 nanorods films show similar high crystallinity and photocatalytic activity compared with prepared films of TiO 2 rutile phase. Additionally, their surface wetting properties were studied and showed hydrophobic behavior with contact angle higher than 120°. The hydrophobicity of 3%N-doped TiO 2 nanorod films is shown to be enhanced because of TiO 2 nanorods diameter decreasing. Additionally, the results clearly show that the prepared 3%N-doped TiO 2 nanorods films exhibit both higher hydrophobicity and the best photocatalytic activity toward the degradation of MB under visible light irradiation.

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Section: Resultssupporting

confidence: 63%

Effect of nitrogen doping on the photocatalytic activity and hydrophobic property of rutile TiO₂ nanorods array

Kongsong

Taleb

Masae

et al. 2018

Surface & Interface Analysis

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“…A synergetic effect between inorganic filters and AO has already been demonstrated in the VIS range [22], in agreement with the results of the present study. In addition, it is important to notice that the scattering properties of Spirulina have already been reported in the VIS range [34], which makes them behave as inorganic filters increasing the protection in that range. Liebel et al [11] also showed that sunscreens with AO were effective in preventing VIS-induced ROS.…”

Section: Discussionmentioning

confidence: 99%

Radical-Scavenging Activity of a Sunscreen Enriched by Antioxidants Providing Protection in the Whole Solar Spectral Range

Souza

Campos²,

Schanzer³

et al. 2017

Skin Pharmacol Physiol

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Background/Aim: The main reason for extrinsic skin aging is the negative action of free radicals. The formation of free radicals in the skin has been associated with ultraviolet (UV) exposure and also to visible (VIS) and near-infrared (NIR) irradiations. The aim of the present study was to evaluate the efficacy of a sunscreen in the whole solar range. Methods: The radical-scavenging activity of a sunscreen in the UV, VIS, and NIR ranges was evaluated using electron paramagnetic resonance spectroscopy. Ex vivo penetration profiles were determined using confocal Raman microscopy on porcine ear skin at different time points after application. Results: Compared to the untreated skin, the sunscreen decreased the skin radical formation in the UV and VIS regions. Additional protection in the VIS and NIR ranges was observed for the sunscreen containing antioxidants (AO). The penetration depth of the cream was less than 11.2 ± 3.0 µm for all time points. Conclusion: A sunscreen containing AO improved the photoprotection in the VIS and NIR ranges. The sunscreen was retained in the stratum corneum. Therefore, these results show the possibility of the development of effective and safer sunscreen products.

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“…According to the results shown in figure 3B-a, the non-sensitized homogeneous TiO 2 spheres present an average particle size of about 26 nm in diameter. TiO 2 samples show a relatively similar surface structure to non-sensitized TiO 2 , it should be noted that due to the dispersion of natural pigments on sensitized catalysts [36], the surface of such samples seems slightly rougher as compared to non-sensitized particles.…”

Section: Sem Analysismentioning

confidence: 94%

Photosensitization effect on visible-light-induced photocatalytic performance of $$\hbox {TiO}_{2}$$/chlorophyll and flavonoid nanostructures: kinetic and isotherm studies

2019

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Preparation and performance of natural dye-sensitized photocatalysts of TiO 2 are described in this study. Such sensitized nanostructures offer visible-light-reactive systems for the photodegradation of organic pollutants. Natural pigments of chlorophyll and flavonoid extracted from parsley leaves and Curcuma longa roots are grated on TiO 2 nanoparticles as photosensitizers using an incipient wetness impregnation method. The as-prepared samples are structurally characterized by combined techniques, such as X-ray diffraction, scanning electron microscopy and Fourier transform infrared. The diffuse reflectance UV-Vis spectra are also used to investigate band-gap energies. The resultant band-gap energies confirm the ability of visible light absorption and thereby the ability of more efficient generation of photoexcited charge-carriers. The photocatalytic performance of dye-sensitized nanoparticles is tested in terms of decolourization efficiency of MB dye as a function of involved operating parameters including reaction time, amount of catalyst, initial MB concentration and pH. Both samples show the excellent photocatalytic efficiencies relevant to the red shift generated and high absorption of photons in the visible region. However, the highest efficiency is obtained for TiO 2 /chlorophyll catalysts (93%) compared to TiO 2 /flavonoid samples (91%), which is perfectly in agreement with their band-gap energies and visible-light absorption ability. Photodegradation process kinetics is investigated by the Langmuir-Hinshelwood model, while the adsorption equilibrium is described based on Langmuir and Freundlich isotherms.

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Role of chlorophyll in Spirulina on photocatalytic activity of CO 2 reduction under visible light over modified N-doped TiO 2 photocatalysts

Cited by 84 publications

References 81 publications

Effect of nitrogen doping on the photocatalytic activity and hydrophobic property of rutile TiO₂ nanorods array

Effect of nitrogen doping on the photocatalytic activity and hydrophobic property of rutile TiO₂ nanorods array

Radical-Scavenging Activity of a Sunscreen Enriched by Antioxidants Providing Protection in the Whole Solar Spectral Range

Photosensitization effect on visible-light-induced photocatalytic performance of $$\hbox {TiO}_{2}$$/chlorophyll and flavonoid nanostructures: kinetic and isotherm studies

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Role of chlorophyll in Spirulina on photocatalytic activity of CO 2 reduction under visible light over modified N-doped TiO 2 photocatalysts

Cited by 84 publications

References 81 publications

Effect of nitrogen doping on the photocatalytic activity and hydrophobic property of rutile TiO2 nanorods array

Effect of nitrogen doping on the photocatalytic activity and hydrophobic property of rutile TiO2 nanorods array

Radical-Scavenging Activity of a Sunscreen Enriched by Antioxidants Providing Protection in the Whole Solar Spectral Range

Photosensitization effect on visible-light-induced photocatalytic performance of $$\hbox {TiO}_{2}$$/chlorophyll and flavonoid nanostructures: kinetic and isotherm studies

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Effect of nitrogen doping on the photocatalytic activity and hydrophobic property of rutile TiO₂ nanorods array

Effect of nitrogen doping on the photocatalytic activity and hydrophobic property of rutile TiO₂ nanorods array