Tuning the photoactivity of TiO2 nanoarchitectures doped with cerium or neodymium and application to colour removal from wastewaters. Issue 7 (21st March 2021)
- Record Type:
- Journal Article
- Title:
- Tuning the photoactivity of TiO2 nanoarchitectures doped with cerium or neodymium and application to colour removal from wastewaters. Issue 7 (21st March 2021)
- Main Title:
- Tuning the photoactivity of TiO2 nanoarchitectures doped with cerium or neodymium and application to colour removal from wastewaters
- Authors:
- Vieira, Gabriela Bonfanti
Scaratti, Gidiane
Rodembusch, Fabiano Severo
De Amorim, Suelen Maria
Peterson, Michael
Puma, Gianluca Li
Moreira, Regina De Fátima Peralta Muniz - Abstract:
- ABSTRACT: The impact of cerium (Ce) and neodymium (Nd) rare-earth metal doping of TiO2 prepared by the hydrothermal method was investigated to tailor effective photocatalytic degradation of coloured wastewater under UV or visible illumination. The hydrothermal treatment of TiO2 decreased the pHpzc from 6.3 to 3.1–3.8 favouring the affinity for cationic water contaminants. Doping with Ce and Nd modified the crystallinity and the morphology of the photocatalysts and significantly increased the BET surface area and the adsorption capacity of cationic dyes. The photocatalytic activity under UV light irradiation decreased due to shielding of the catalyst active area by excessive amount of dye adsorbed. Conversely, the photocatalytic activity of the Ce and Nd doped TiO2 increased under visible light irradiation by 1.2 times as a result of the dye photosensitization effect. It was demonstrated that two-steps dark adsorption and photocatalytic reaction or one-step simultaneous adsorption and reaction can produce significantly different results for the photocatalytic degradation of dyes in coloured waters, the rate being controlled by the competitive adsorption of the reacting organics and the H2 O/OH − species. The reaction is driven by the radical oxygen species (ROS) formed on the catalyst surface the nature of which, differs under UV or visible light irradiation. The Ce-doped TiO2 and Nd-doped TiO2 photocatalysts with 0.5% rare-earth content were found to be efficient in theABSTRACT: The impact of cerium (Ce) and neodymium (Nd) rare-earth metal doping of TiO2 prepared by the hydrothermal method was investigated to tailor effective photocatalytic degradation of coloured wastewater under UV or visible illumination. The hydrothermal treatment of TiO2 decreased the pHpzc from 6.3 to 3.1–3.8 favouring the affinity for cationic water contaminants. Doping with Ce and Nd modified the crystallinity and the morphology of the photocatalysts and significantly increased the BET surface area and the adsorption capacity of cationic dyes. The photocatalytic activity under UV light irradiation decreased due to shielding of the catalyst active area by excessive amount of dye adsorbed. Conversely, the photocatalytic activity of the Ce and Nd doped TiO2 increased under visible light irradiation by 1.2 times as a result of the dye photosensitization effect. It was demonstrated that two-steps dark adsorption and photocatalytic reaction or one-step simultaneous adsorption and reaction can produce significantly different results for the photocatalytic degradation of dyes in coloured waters, the rate being controlled by the competitive adsorption of the reacting organics and the H2 O/OH − species. The reaction is driven by the radical oxygen species (ROS) formed on the catalyst surface the nature of which, differs under UV or visible light irradiation. The Ce-doped TiO2 and Nd-doped TiO2 photocatalysts with 0.5% rare-earth content were found to be efficient in the degradation of MB in aqueous solution, removing the colour and reducing the toxicity of wastewaters. GRAPHICAL ABSTRACT: UF0001 … (more)
- Is Part Of:
- Environmental technology. Volume 42:Issue 7(2021)
- Journal:
- Environmental technology
- Issue:
- Volume 42:Issue 7(2021)
- Issue Display:
- Volume 42, Issue 7 (2021)
- Year:
- 2021
- Volume:
- 42
- Issue:
- 7
- Issue Sort Value:
- 2021-0042-0007-0000
- Page Start:
- 1038
- Page End:
- 1052
- Publication Date:
- 2021-03-21
- Subjects:
- Cerium -- neodymium -- colored wastewaters -- adsorption -- photocatalysis
Environmental engineering -- Periodicals
Environmental protection -- Periodicals
628.05 - Journal URLs:
- http://www.tandfonline.com/toc/tent20/current ↗
http://www.tandfonline.com/ ↗ - DOI:
- 10.1080/09593330.2019.1651402 ↗
- Languages:
- English
- ISSNs:
- 0959-3330
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 3791.698800
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 22691.xml