Search results for: TIO2 SURFACE STRUCTURE

• Exploring of electronic structure of nitrogen-modified TiO2 photocatalysts through photocurrent and surface photovoltage studies

  Publication

  • R. Beranek
  • B. Neumann
  • S. Sakthivel
  • M. Janczarek
  • T. Dittrich
  • H. Tributsch
  • H. Kisch

  - CHEMICAL PHYSICS - Year 2007

  Przeprowadzono 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

• The interplay between dopant and a surface structure of the photocatalyst – The case study of Nb-doped faceted TiO2

  Publication

  • S. Dudziak
  • E. Kowalska
  • K. Wang
  • J. Karczewski
  • M. Sawczak
  • B. Ohtani
  • A. Zielińska-Jurek

  - APPLIED CATALYSIS B-ENVIRONMENTAL - Year 2023

  Anatase nanoparticles, exposing the majority of the {0 0 1}, {1 0 0} and {1 0 1} facets were synthesized and doped with different niobium amount to investigate the self-trapping of the excess electrons and resulting photocatalytic activity. Photocatalyst structure and presence of excess electrons inside the obtained Nb-doped anatase samples was confirmed by the combination of structural and spectroscopic analyses. Only for the...

  Full text available to download

• The effect of preparation route on structure and photocatalytic properties of bimetallic nanoparticles (Au/Pd, and Au/Pt) deposited at TiO2 surface

  Publication

  • A. Zaleska-Medynska
  • A. Gołąbiewska
  • A. Malankowska
  • M. Pohl
  • J. W. Sobczak
  • A. Zielińska-Jurek
  • A. Bruckner

  - Year 2014

  Noble metal nanoparticles have often been used to enhance the photocatalytic activity of TiO2 and to extend the absorption wavelength from the ultraviolet to visible region. Bimetallic nanoparticles, composed of two different metal elements, can exhibit peculiar electronic, optical, and catalytic or photocatalytic properties that are absent in the corresponding monometallic nanoparticles. In this work we show the effect kind and...

• Visible light photoactivity and structure of doped TiO2

  Publication

  • A. Zaleska-Medynska
  • P. Górska
  • E. Grabowska
  • J. W. Sobczak
  • M. Gazda
  • J. Hupka

  - Year 2008

  Omówiono strukturą i właściwości TiO2 domieszkowanego siarką, węglem oraz borem. Aktywność fotokatalityczna zbadano w reakcji degradacji fenolu pod wpływem światła z zakresu widzialnego (l > 400 nm). Aktywność fotokatalizatorów odniesiono do ich właściwości takich jak powierzchnia właściwa, struktura krystaliczna oraz charakter chemiczny domieszki. Stwierdzono, że fotokatalizatory o najwyższej aktywności mają strukturę anatazu...

• The effect of microemulsion composition on the morphology of Pd nanoparticles deposited at the surface of TiO2 and photoactivity of Pd-TiO2

  Publication

  • M. Długokęcka
  • J. Łuczak
  • Ż. Polkowska
  • A. Zaleska-Medynska

  - APPLIED SURFACE SCIENCE - Year 2017

  A series of microemulsion (ME) system, constituted by different water to surfactant molar ratios (Wo) and oil to surfactant mass ratios (S), have been applied for Pd-TiO2 preparation. The effect of ME properties on the morphology of Pd nanoparticles formed at TiO2 surface and an effect of Pd size and distribution on the surface and photocatalytic properties of Pd-TiO2 were investigated. Microemulsion systems were characterized...

  Full text to download in external service

• TiO2-based magnetic nanocomposites with core-shell structure

  Publication

  • Z. Bielan

  - Year 2020

  The main aim of the doctoral dissertation was preparation and characterization of photocatalysts, with particular emphasis on modified titanium (IV) oxide photocatalysts, which can be applied for the degradation of organic pollutants not susceptible to biodegradation. A particularly important aspect of the work was the development of preparation method of nanocomposites with the magnetic core-shell and photocatalyst shell (TiO2)...

  Full text available to download

• Au-RE-TiO2 nanocomposites: Surface characteristics and photoactivity

  Publication

  • A. Krukowska
  • J. Reszczyńska
  • A. Zaleska-Medynska

  - Physicochemical Problems of Mineral Processing - Year 2014

  The photocatalysts based on TiO2 co-doped with rare earth metal (RE) and gold nanoparticles have been prepared using a sol-gel method and followed by gold reduction. Specific surface areas of the modified photocatalysts were calculated by the Brunauer-Emmett-Teller method (BET). Diffuse reflectance spectra of the obtained photocatalysts were recorded in a UV-Vis spectrophotometer (DRS UV-Vis). The influence of the type of rare...

  Full text available to download

• FTIR Studies of the Surface of TiO2, Fe-TiO2 and Fe-C-TiO2 Photocatalysts in Phenol Oxidation Via the Photo-Fenton Process

  Publication

  • B. A. Tryba
  • M. Inagaki
  • M. Toyoda
  • A. Morawski

  - JOURNAL OF ADVANCED OXIDATION TECHNOLOGIES - Year 2007

  Full text to download in external service

• The inflence of TiO2 structure on the complete decomposition of acetaldehyde gas

  Publication

  • B. Tryba
  • P. Rychtowski
  • J. Srenscek-Nazzal
  • J. Przepiorski
  • P. Rychtowski
  • B. Tryba

  - Materials Research Bulletin - Year 2020

  Full text to download in external service

• Surface Structure of Components Created by Stereolitography

  Publication

  • S. Dzionk

  - Solid State Phenomena - Year 2013

  Stereolithography is an additive rapid prototyping method. This method is based on the principle of solidifying a liquid photopolymer (resin) by laser radiation. Models obtained with this method are characterized by a specific surface structure called “stairstep effect”. It causes that, the surface should be processed by additional finishing (postprocessing). To minimize the additional machining process, the model should be set...