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Search results for: TIO2 MICROSPHERES
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Influence of Annealing Atmospheres on Photoelectrochemical Activity of TiO2 Nanotubes Modified with AuCu Nanoparticles
PublicationIn this article, we studied the annealing process of AuCu layers deposited on TiO2 nanotubes (NTs) conducted in various atmospheres such as air, vacuum, argon, and hydrogen in order to obtain materials active in both visible and UV–vis ranges. The material fabrication route covers the electrochemical anodization of a Ti plate, followed by thin AuCu film magnetron sputtering and further thermal treatment. Scanning electron microscopy...
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Scalable Route toward Superior Photoresponse of UV-Laser-Treated TiO2 Nanotubes
PublicationTitanium dioxide nanotubes gain considerable attention as a photoactive material due to chemical stability, photocorrosion resistance, or lowcost manufacturing method. This work presents scalable pulsed laser modification of TiO2 nanotubes resulting in enhanced photoactivity in a system equipped with a motorized table, which allows for modifications of both precisely selected and any-large sample area. Images obtained from scanning...
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Preparation and Characterization of Defective TiO2. The Effect of the Reaction Environment on Titanium Vacancies Formation
PublicationAmong various methods of improving visible light activity of titanium(IV) oxide, the formation of defects and vacancies (both oxygen and titanium) in the crystal structure of TiO2 is an easy and relatively cheap alternative to improve the photocatalytic activity. In the presented work, visible light active defective TiO2 was obtained by the hydrothermal reaction in the presence of three different oxidizing agents: HIO3, H2O2, and...
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Formation of the hollow nanopillar arrays through the laser-induced transformation of TiO2 nanotubes
PublicationIn the following article, we present a simple, two-step method of creating spaced, hollow nanopillars, from the titania nanotube arrays via pulsed laser-treatment. Due to the high ordering of the structure, the prepared material exhibits photonic properties, which has been shown to increase the overall photoefficiency. The optical and morphological changes in the titania nanotubes after pulsed laser-treatment with 532, 355, and...
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Gallic Acid-Functionalized, TiO2-Based Nanomaterial—Preparation, Physicochemical and Biological Properties
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Modeling of TiO2-Based Electron-Selective Contacts for Crystalline Silicon Solar Cells
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Influence of TiO2 hydrophilicity on the photocatalytic decomposition of gaseous acetaldehyde in a circulated flow reactor
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Application of carbon-coated TiO2 for decomposition of methylene blue in a photocatalytic membrane reactor
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Preparation and photocatalytic activity of boron-modified TiO2 under UV and visible light
PublicationOtrzymano TiO2 domieszkowany borem i wyznaczono jego aktywność fotokatalityczną w zakresie światła UV i Vis. Katalizatory otrzymano metodą zol-żel lub poprzez ucieranie dwutlenku tytanu z prekursorami B. Jako źródło boru zastosowano kwas borowy lub ester trietylowy kwasu borowego. Fotoaktywność próbek badano w reakcji degradacji fenolu (Co = 0,21 mmol/dm3 ) w zakresie światła Vis lub UV. Obecność węgla i boru we wszystkich przygotowanych...
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TiO2 photoactivity in vis and UV light: The influence of calcination temperature and surface properties
PublicationPrzygotowano serię fotokatalizatorów w postaci tlenku tytanu (IV) kalcynowanych w różnych temperaturach od 350 do 750˚C. Charakterystyka fotokatalizatorów za pomocą metod XRD, UV-Vis/DRS, FTIR, XPS, BET oraz BJH wykazała, że próbka TiO2 aktywna w świetle widzialnym posiadała strukturę anatazu, powierzchnię właściwą ok. 200 m2/g, absorbowała światło o długości fali λ>400 nm oraz zawierała 10,1 % at. węgla (wiązanie C-C). Aktywność...
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Detoxification of parabens using UV-A enhanced by noble metals—TiO2 supported catalysts
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A tight-binding model of a carbon nanotube interacting with TiO2 rutile (110) surface
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Influence of geometry and annealing temperature in argon atmosphere of TiO2 nanotubes on their electrochemical properties
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Influence of Thermal Modification and Morphology of TiO2 Nanotubes on Their Electrochemical Properties for Biosensors Applications
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Electrochemical stability of TiO2 nanotubes deposited with silver and gold nanoparticles in aqueous environment
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Characterization of TiO2 Modified with Bimetallic Ag/Au Nanoparticles Obtained in Microemulsion System
PublicationFotokatalizatory TiO2 modyfikowane nanocząstkami bimetalicznymi Ag/Au przygotowano metodą mikroemulsyjną w układzie woda/surfaktant/cykloheksan. Aktywność fotokatalityczna próbek Ag/Au-TiO2 oszacowano przez wyznaczenie stopnia degradacji fenolu pod wpływem światła VIS. Fenol został użyty jako model zanieczyszczeń, ponieważ jest substancją niebezpieczną dla środowiska. Najwyższą aktywność w zakresie światła widzialnego wykazała...
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Photosensitization of TiO2 and SnO2 by Artificial Self-Assembling Mimics of the Natural Chlorosomal Bacteriochlorophylls
PublicationOf all known photosynthetic organisms, the green sulfur bacteria are able to survive under the lowest illumination conditions due to highly efficient photon management and exciton transport enabled by their special organelles, the chlorosomes, which consist mainly of self-assembled bacteriochlorophyll c, d, or e molecules. A challenging task is to mimic the principle of self-assembling chromophores in artificial light-harvesting...
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Preparation of porous TiO2 films by means of pulsed laser deposition for photocatalytic applications
PublicationIn this work the preparation and structure properties of porous thin films of TiO2 were investigated. The films were produced by means of the pulsed laser deposition technique using laser pulses at 266nm (10Hz) and at fluencies of 1-3.5J/cm2. The process was performed in vacuum using O2 buffer gas and films were deposited on the SiO2 glass or Si substrate. X-ray diffraction (XRD) and Raman analysis of the structure and chemical...
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Porowate nanostruktury anatazu wytwarzane z Ti oraz TiO2 metodą PLD
PublicationNiniejsza praca dotyczy wytwarzania cienkich warstw dwutlenku tytanu metodą PLD. Za pomocą technik spektroskopowych zbadany został wpływ wartości ciśnienia gazu osłonowego na otrzymywane struktury krystaliczne w warstwach. Obserwowano także zależność uzyskanych faz krystalicznych od rodzaju odparowywanego materiału.
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Interfacial Charge Transfer Complexes in TiO2-Enediol Hybrids Synthesized by Sol–Gel
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Enhanced Degradation of Ethylene in Thermo-Photocatalytic Process Using TiO2/Nickel Foam
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Effect of UV radiation and chitosan coating on the adsorption-photocatalytic activity of TiO2 particles
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On electrical and photoconductive properties of mixed Nb2O5/TiO2 sol-gel thin films
PublicationPraca prezentuje wyniki przewodnictwa elektrycznego i fotoprzewodnictwa cienkich warstw TiO2 i Nb2O5/TiO2 otrzymanych metodą zol-żel. Pomiary przeprowadzono w funkcji temperatury i natężenia oświetlenia zarówno w próżni jak i w powietrzu. Struktura warstw została zbadana metodami XRD oraz AFM. W pracy zaobserwowano zaobserwowano spadek fotoprzewodnictwa wraz z zawartością Nb2O5
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Photocatalytic Degradation of 4,4′-Isopropylidenebis(2,6-dibromophenol) on Sulfur-Doped Nano TiO2
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Bifunctional catalyst based on molecular structure: Spherical mesoporous TiO2 and gCN for photocatalysis
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Effect of sol composition on the properties of TiO2 powders obtained by the sol-gel method
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Boosting of Antibacterial Performance of Cellulose Based Paper Sheet via TiO2 Nanoparticles
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Effect of brookite on the photocatalytic properties of mixed-phase TiO2 obtained at a higher temperature
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Photocatalytic water disinfection under the artificial solar light by fructose-modified TiO2
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A preliminary study on antifungal effect of TiO2-based paints in natural indoor light
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Silver-doped TiO2 prepared by microemulsion method: surface properties, bio- and photoactivity
PublicationOtrzymane fotokatalizatory typu Ag-TiO2 wykazywały wyższą aktywność w reakcjach fotodegradacji fenolu w obecności promieniowania z zakresu UV oraz światła widzialnego w porównaniu z komercyjnym katalizatorem Degussa P25 oraz czystym niedomieszkowanym TiO2, otrzymanym w mikroemulsji woda-AOT-cykloheksan. Powierzchnia właściwa (BET) otrzymanych katalizatorów wynosiła od 100 do 160 m2/g. Na podstawie analizy rentgenowskiej (XRD) stwierdzono,...
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TiO2 and Reducing Gas: Intricate Relationships to Direct Reduction of Iron Oxide Pellets
PublicationIn response to the imperative for sustainable iron production with reduced CO2 emissions, this study delves into the intricate role of TiO2 in the direct reduction of iron oxide pellets. The TiO2-dependent reducibility of iron oxide pellets utilizing H2 and CO gas across varied temperatures and gas compositions is thoroughly investigated. Our findings unveil the nuanced nature of the TiO2 effect, underscored by its concentration-dependent...
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The effect of gold shape and size on the properties and visiblelight-induced photoactivity of Au-TiO2
PublicationtIn the present investigation, TiO2modified with a different geometry and size of gold particles, suchas nanospheres (NSPs), nanostars (NSTs) and nanorods (NRs), were prepared by the immobilizationmethod. The effect of the gold shape, size and TiO2matrix type (TiO2microspheres or rutile TIO-6 TiO2)were systematically investigated. The obtained photocatalysts were thoroughly characterized by UV–visdiffuse-reflectance spectroscopy...
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The effect of nanoparticles size on photocatalytic and antimicrobial properties of Ag-Pt/TiO2 photocatalysts
PublicationAg-Pt-modified TiO2 nanocomposites were synthesized using the sol–gel method. Bimetallic modified TiO2 nanoparticles exhibited improved photocatalytic activity under visible-light irradiation, better than monometallic Ag/TiO2 and Pt/TiO2 nanoparticles (NPs). All modified powders showed localized surface plasmon resonance (LSPR) in visible region. The photocatalysts’ characteristics by X-ray diffractometry (XRD), scanning transmission...
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PREPARATION AND CHARACTERIZATION OF CoFe2O4/TiO2-PANI HYBRID NANOCOMPOSITE WITH MAGNETIC AND PHOYOCATALYTIC ACTIVITY
PublicationHybrid nanocomposites consisting of inorganic component and organic conducting polymer are promising materials, which can be applied in heterogeneous photocatalysis. Titanium(IV) oxide is widely used photocatalysts due to its non-toxicity, low cost and chemical stability. The main disadvantage of TiO2 is low photocatalytic activity under visible light. Conducting polymers, also known as conjugated polymers are polymer materials...
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Preparation and characterization of Pt–N/TiO2 photocatalysts and their efficiency in degradation of recalcitrant chemicals
PublicationSeries of Pt–N/TiO2 photocatalysts were synthesized using the sol–gel method. The photocatalysts’ characteristics by X-ray diffractometry (XRD), scanning transmission electron microscopy (STEM), diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS) showed that sample with the molar ratio Ti:N equal 1:4 and platinum nanoparticles size of about 3 nm had anatase structure, about 94 m2/g specific surface area...
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Novel decahedral TiO2 photocatalysts modified with Ru or Rh NPs: Insight into the mechanism
PublicationNovel decahedral TiO2 modified with Ru or Rh NPs were successfully synthesized by hydrothermal method. The effect of metal type as well as amount of noble metal precursor (0.05, 0.1, 0.2, 0.3 and 0.5 wt.%) on the photocatalytic activity were investigated. Decahedral TiO2 decorated by Ru and Rh nanoparticles was prepared by photodeposition method, whereas Rh doped TiO2 was obtained by onestep hydrothermal method with introduction...
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Optical properties of thin TiO2 film deposited on the fiber optic sensor head
PublicationThe presented study was focused on investigation of the titanium dioxide (TiO2) thin film deposited on the fiber tip. The intention of this investigation was using TiO2 film in the construction of the optical fiber sensor head. In the demonstrated construction TiO2 thin layer was deposited on the tip of a commonly used telecommunication single mode optical fiber (SMF-28) by means of the Atomic Layer Deposition (ALD). Thickness...
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Protective properties of Al2O3 + TiO2 coating produced by the electrostatic spray deposition method
PublicationMechanical resistance of Al2O3 + TiO2 nanocomposite ceramic coating deposited by electrostatic spray deposition method onto X10CrAlSi18 steel to thermal and slurry tests was investigated. The coating was produced from colloidal suspension of TiO2 nanoparticles dispersed in 3 wt% solution of Al2(NO3)3, as Al2O3 precursor, in ethanol. TiO2 nanoparticles of two sizes, 15 nm and 32 nm, were used in the experiments. After deposition,...
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Preparation of TiO2-based catalysts modified with thioacetamide and thiourea for visible light photocatalysis
PublicationZa pomocą dwóch różnych metod preparatyki przygotowano aktywne w świetle widzialnym katalizatory tytanowe modyfikowane tioacetamidem i tiomocznikiem. Aktywność fotokatalityczną otrzymanych proszków zbadano w reakcji degradacji fenolu w roztworze wodnym w obecności światła widzialnego. Zbadano wpływ ilości zastosowanej w trakcie syntezy domieszki organicznej na aktywność fotokatalityczną otrzymanych katalizatorów. Wybrane próbki...
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Exploring of electronic structure of nitrogen-modified TiO2 photocatalysts through photocurrent and surface photovoltage studies
PublicationPrzeprowadzono pomiary fotonapięcia powierzchniowego i fotoprądu w obecności różnych reduktorów celem otrzymania eksperymentalnego potwierdzenia położenia pasma walencyjnego w strukturze elektronowej tlenku tytanu(IV) modyfikowanego azotem. Zaobserwowano silne sprzężenie poziomów N 2p i O 2p, którego konsekwencją jest powstanie nowego pasma walencyjnego
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Various types of semiconductor photocatalysts modified by CdTe QDs and Pt NPs for toluene photooxidation in the gas phase under visible light
PublicationA novel synthesis process was used to prepare TiO2 microspheres, TiO2 P-25, SrTiO3 and KTaO3 decorated by CdTe QDs and/or Pt NPs. The effect of semiconductor matrix, presence of CdTe QDs and/or Pt NPs on the semiconductor surface as well as deposition technique of Pt NPs (photodeposition or radiolysis) on the photocatalytic activity were investigated. The as-prepared samples were characterized by X-ray powder diffractometry (XRD),...
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Electrical conductivity of NbN-SiO2 films obtained by ammonolysis of Nb2O5-SiO2 sol-gel derived coatings
PublicationW pracy przedstawiono badania przewodnictwa elektrycznego (w zakresie 5-280K) warstw NbN-SiO2 o grubości 450 nm. Warstwy uzyskano poprzez azotowanie otrzymanych metodą zol-żel warstw Nb2O5-SiO2, o różnym stosunku molowym Nb2O5/SiO2. Azotowanie takich warstw w temperaturze 1200C prowadzi do otrzymania metalicznych granul NbN w amorficznej matrycy SiO2. Struktura warstw była badana mikroskopem sił atomowych (AFM) oraz metodą dyfrakcji...
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Modelling and optimisation of MXene-derived TiO2/Ti3C2 synthesis parameters using Response Surface Methodology based on the Box–Behnken factorial design. Enhanced carbamazepine degradation by the Cu-modified TiO2/Ti3C2 photocatalyst
PublicationIn the present study, a hydrothermal method in a water/ethanol environment was used for the first time to obtain novel Cu/TiO2/Ti3C2 composites with high photocatalytic activity for the degradation of carbamazepine (CBZ) under simulated solar light. The Box–Behnken factorial design was coupled with Response Surface Methodology (RSM) for synthesis parameter optimisation. The effect of different synthesis parameters, including temperature, time...
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Ultrasonic-assisted Electrodeposition of Cu-Sn-TiO2 Nanocomposite Coatings with Enhanced Antibacterial Activity
PublicationCopper-based coatings are known for their high antibacterial activity. In this study, nanocomposite Cu–Sn–TiO2 coatings were obtained by electrodeposition from an oxalic acid bath additionally containing 4 g/dm3 TiO2 with mechanical and ultrasonic agitation. Ultrasound treatment was performed at 26 kHz frequency and 32 W/dm3 power. The influence of agitation mode and the current load on the inclusion and distribution of the TiO2...
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Warstwy tlenkowe TiO2 oraz MoO3 jako fotoanody aktywne w świetle widzialnym
PublicationNiniejsza rozprawa doktorska poświęcona jest opracowaniu metod otrzymywania i charakterystyki warstw elektrodowych dwóch półprzewodników tlenkowych a) TiO2 i b) MoO3, jako potencjalnych fotoanod aktywnych w świetle widzialnym. Zakres pracy doktorskiej obejmuje: a) opracowanie metody wytwarzania nanorurek ditlenku tytanu (TiO2NT) oraz ich modyfikację prowadzącą do zwiększenia fotoaktywności i pojemności elektrycznej, a także charakterystykę...
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Towards spectroscopic monitoring of photoelectrodes: In-situ Raman photoelectrochemistry of a TiO2/prussian blue photoanode
PublicationHere, novel in-situ Raman photoelectrochemical measurements are performed. The obtained results have proved that it is possible to track the progress of a photoelectrochemical reaction that takes place on a semiconducting electrode using the spectroscopic method. As an exemplary system, the Ti/TiO2/Prussian blue electrode is investigated. Since TiO2 is an n-type semiconductor, it cannot act as an efficient anode in dark conditions....
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Microwave-assisted synthesis of a TiO2-CuO heterojunction with enhanced photocatalytic activity against tetracycline
PublicationA microwave method was used for the synthesis of TiO2-CuO oxide systems. A detailed investigation was made of the effect of the molar ratio of components (TiO2:CuO=9:1, 7:3, 5:5, 3:7, 1:9) on the crystalline structure and morphology. Transmission electron microscopy (TEM) confirmed the presence of octahedral and rod-shaped titania particles and sheet copper(II) oxide particles; moreover, HRTEM analysis indicated the presence of...
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SESSILE DROPLET CONTACT ANGLE OF WATER-Al2O3, WATER-TiO2 AND WATER-Cu NANOFLUIDS
PublicationThe goal of the present work was the experimental determination of the contact angle of droplets of three nanofluids on various substrates. Of particular interest was effect of nanoparticle concentration on droplet contact angle.
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Ordered TiO2 nanotubes: the effect of preparation parameters on the photocatalytic activity in air purification process
PublicationVertically ordered TiO2 nanotube arrays were synthesized by anodic oxidation of titanium foil in glycerol, ethylene glycol and water-based electrolytes. The effect of electrolyte composition, anodization voltage, ultrasonic treatment and calcination time on the morphology of the resulting thin films, as well as on their photocatalytic activity in toluene removal, used as a model volatile organic compound, was investigated. Toluene,...