Enhanced electrochemical behavior of novel acceptor doped titanium dioxide catalysts for photocatalytic applications

Shyniya, C. R.; Kanagaraj, Amarsingh Bhabu; Rajasekaran, T.

doi:10.1007/s10854-017-6396-6

Cited by 18 publications

(10 citation statements)

References 42 publications

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“…The obtained band gap values were 3.1 eV for pure TiO 2 , decreased to 2.9 eV for 1 mol% Fe-TiO 2 , followed by 2.8 and 2.7 eV for the 2 and 5 mol% Fe-TiO 2 nanopowders, respectively. An acceptable agreement was found with earlier studies, in which TiO 2 anatase was reported to have an optical band gap of around 3.2 eV, while for the TiO 2 doped with iron, the value gradually decreased when increasing the dopant concentration [ 103 ]. This reduction is probably associated with the formation of new intermediate energy levels [ 82 ].…”

Section: Resultssupporting

confidence: 90%

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Enhanced Fe-TiO2 Solar Photocatalysts on Porous Platforms for Water Purification

et al. 2022

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In this study, polyethylene glycol-modified titanium dioxide (PEG-modified TiO2) nanopowders were prepared using a fast solvothermal method under microwave irradiation, and without any further calcination processes. These nanopowders were further impregnated on porous polymeric platforms by drop-casting. The effect of adding iron with different molar ratios (1, 2, and 5%) of iron precursor was investigated. The characterization of the produced materials was carried out by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. Optical characterization of all the materials was also carried out. SEM showed that pure TiO2 and Fe-TiO2 nanostructures presented similar nanosized and spherical particles, which uniformly covered the substrates. From XRD, pure TiO2 anatase was obtained for all nanopowders produced, which was further confirmed by Raman spectroscopy on the impregnated substrates. XPS and UV–VIS absorption spectroscopy emission spectra revealed that the presence of Fe ions on the Fe-TiO2 nanostructures led to the introduction of new intermediate energy levels, as well as defects that contributed to an enhancement in the photocatalytic performance. The photocatalytic results under solar radiation demonstrated increased photocatalytic activity in the presence of the 5% Fe-TiO2 nanostructures (Rhodamine B degradation of 85% after 3.5 h, compared to 74% with pure TiO2 for the same exposure time). The photodegradation rate of RhB dye with the Fe-TiO2 substrate was 1.5-times faster than pure TiO2. Reusability tests were also performed. The approach developed in this work originated novel functionalized photocatalytic platforms, which were revealed to be promising for the removal of organic dyes from wastewater.

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Section: Resultssupporting

confidence: 90%

“…However, an important note should be made regarding the amount of iron content that plays an important role in photocatalytic activity [ 103 ]. Some studies reported, for instance, a reduction in the photocatalytic activity when the dopant concentration increases.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Fe-TiO2 Solar Photocatalysts on Porous Platforms for Water Purification

et al. 2022

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“…The TiO 2 nanopowder was also investigated using FTIR and the result is presented in Figure 4. The appearance of a broad band between 3000 and 3600 cm −1 , as well as the band at 1680 cm −1 , indicates the presence of hydroxyl groups, due to the adsorption of water from the surrounding environment [43,50,71,72]. For the lower wavenumber region, a peak located at around 1111 cm −1 is visible and attributed to the stretching vibration of the Ti-OH bond [50], whereas the peaks located at 438 cm −1 and 1396 cm −1 are attributed to Ti-O bending [73] and Ti-O-Ti stretching modes [74], respectively.…”

Section: Ftirmentioning

confidence: 99%

Floating TiO2-Cork Nano-Photocatalysts for Water Purification Using Sunlight

et al. 2022

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In the present study, titanium dioxide (TiO2) nano-photocatalysts were synthesized through microwave irradiation. In a typical microwave synthesis, TiO2 nanomaterials were simultaneously produced in powder form and also directly covering cork substrates. The TiO2 nanopowder was analyzed by X-ray diffraction (XRD), Raman spectroscopy and transmission electron microscopy (TEM), revealing that the solvothermal microwave synthesis resulted only in the TiO2 anatase phase. From Fourier-transform infrared spectroscopy (FTIR), cork’s organic species, along with bands of TiO2, were detected. UV–VIS absorption spectrum revealed an absorption extension to the visible region, since a brown powdered TiO2 product was obtained. Very fine nanoparticles were observed displaying a nearly spherical shape that agglomerates in larger particles. These larger particles fully covered the surface of the honeycomb cork cells, originating TiO2 functionalized cork platforms. The TiO2 functionalized substrates were further tested as floating photocatalysts and their photocatalytic activity was assessed from rhodamine B degradation under solar simulating light and natural sunlight. Reusability tests were also performed under natural sunlight. The strategy applied in this research work allowed the production of green and low-cost cork platforms based on TiO2 photoactive materials with the ability to purify polluted water under natural sunlight.

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“…TiO 2 doped with noble metal nanoparticles enhances optical and biological properties. Plasmonic nanoparticles have a strong absorption in the visible area due to its localized surface plasmon resonance [11].…”

Section: Synthesis Of Ag/ac Composite Using Jasmine Ower Extractmentioning

confidence: 99%

Enhanced photocatalytic and biological observations of green synthesized AC, AC/Ag and AC/Ag/TiO2 nanocomposites

Amalanathan¹,

Parvathiraja²,

Alothman³

et al. 2021

Preprint

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In this study, AC/Ag/TiO2 nanocomposite was successfully synthesized by hydrothermal method using jasmine flower extract. The reactions of reduction, stabilization and capping was executed from the biomolecules of jasmine flower extract. The decoration of activated carbon and noble metal to the metal oxide enhanced the properties in all ways. As the modified structural, optical and morphological properties of as prepared nanocomposite was characterized using various techniques such as, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), UV-Visible spectroscopy, Scanning electron microscope (SEM) with Energy dispersive X-ray spectroscopy (EDX), and Transmission electron microscope (TEM). The photocatalytic activities under sunlight were evaluated by the degradation of methylene blue (MB). Antibacterial activity was tested against E-coli and S. aureus. The characterization results show that AC/Ag/TiO2 nanocomposite is crystalline, needle like morphology and highly optically active catalyst. The investigated AC/Ag/TiO2 nanocomposite shows 96% maximum degradation efficiency at the end of 120 minutes undervisible light irradiation. The degradation efficiency and antibacterial activity is readily higher than that of commercial TiO2. The plasmonic support to the activated carbon and titanium nanoparticles creates large surface area, active sites and accelerated the free radical generation. These characteristics demonstrated that the prepared AC/Ag/TiO2 nanocomposite material is highly suitable for the decomposition of methylene blue and waste water treatment.

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Enhanced electrochemical behavior of novel acceptor doped titanium dioxide catalysts for photocatalytic applications

Cited by 18 publications

References 42 publications

Enhanced Fe-TiO2 Solar Photocatalysts on Porous Platforms for Water Purification

Enhanced Fe-TiO2 Solar Photocatalysts on Porous Platforms for Water Purification

Floating TiO2-Cork Nano-Photocatalysts for Water Purification Using Sunlight

Enhanced photocatalytic and biological observations of green synthesized AC, AC/Ag and AC/Ag/TiO2 nanocomposites

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