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DTU Studieprojekt - Development of photocatalytic pigments for coatings applications using spray-drying technology

Danmarks Tekniske Universitet (DTU)

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Development of photocatalytic pigments for coatings applications using spray-drying technology

Udbyder
Vejleder
Sted
København og omegn

  • Aim of the project
    The purpose of this project is the synthesis and characterization of novel photocatalytic pigments prepared using spray-drying and their further implementation into photocatalytic coatings.

Description of the project

Spray-drying is an established method within coatings technology widely used to produce ordinary powder pigments. It can be used to produce microsized multishelled particles with mesoporous structure with high surface area [4,5]. The use of spray-drying for synthesis of photocatalytic pigments has not been fully explored, but it is conceived that could lead to production of novel photocatalysts, as an alternative to more established nanosized materials, with higher performance and improved sustainability.

However, the performance of these coatings is severely hindered because anatase is only active under UV light, whereas sunlight and most common artificial light sources provide only minor UV contribution [3]. Another drawback for these coatings is the concomitant photodegradation of the film forming agent that compromises the coating stability. The toxicity of nanosized photocatalysts also imposes limitations to many potential applications of photocatalytic coatings.

Background
The state-of-the-art of photocatalytic coatings use titania nanoparticles (~21 nm) in anatase form, which is a wide band gap semiconductor that acts as photocatalyst [1]. Under UV irradiation (

The motivation of this project arises from the multiple applications of the resulting photocatalytic coatings in environmental and health areas, including air purification in highly polluted areas, self-cleaning coatings, and antibacterial coatings.

The photocatalysts are primarily metal oxide semiconductors than confer catalytic functionality to organic-based coatings, as result of their combination with film forming agents, other pigments, solvents and additives.

  • This work will take place within the framework of The Hempel Foundation Coatings Science and Technology Centre (CoaST).

The candidate will be responsible of the laboratory-scale production of photocatalysts using spray-drying technology. The structural, electronic and textural properties of the synthesized materials will be characterized using morphology and spectroscopy analysis techniques, whereas the photocatalytic activity will be asserted by studying the kinetics of model reactions in artificial irradiation experiments.

Optimization of spray-drying process parameters for photocatalysts production will be based on the outcome of the structure and performance evaluation, which will allow identifying structure-activity relationships. Finally, the most promising photocatalysts will be ultimately used for formulation, characterization and testing of photocatalytic coatings.

References
[1] Fujishima and Honda. Nature 238 (1972) 37.

[2] T. Maggos, J.G. Bartzis, M. Liakou, C. Gobin. J. Hazard. Mater. 146 (2007) 668.

[3] Galenda, F. Visentin, R. Gerbasi, M. Favaro, A. Bernardi, N. El Habra. Appl. Catal. B Environ. 232 (2018) 194.

[4] Z. Padashbarmchi, A.H. Hamidian, H. Zhang, L. Zhou, N. Khorasani, M. Kazemzad, C. Yu. RSC Adv. 5 (2015) 10304.

[5] H. Ren, R. Yu, J. Qi, L. Zhang, Q. Jin, D. Wang. Adv. Mater. 31 (2019) 1805754.

Forudsætninger
Relevant BSc degree, with emphasis on physical chemistry and material science. Experience in laboratory synthesis and characterization of inorganic materials is an advantage.

Emneord

  • Bioteknologi og biokemi
  • Fysik
  • Informationsteknologi
  • Kemi
  • Matematik
  • Transport og logistik
  • Teknisk kemi
  • Sundhed og sygdomme
Kontakt
Virksomhed/organisation
DTU Kemiteknik

Navn
Amado Andrés Velázquez-Palenzuela

Stilling
Forsker

Mail
aavp@kt.dtu.dk

Vejleder-info
Kandidatuddannelsen i Kemisk og Biokemisk Teknologi
Vejleder
Amado Andrés Velázquez-Palenzuela

Medvejledere
Sara Golbarg, Jakob Munkholt Christensen, Kim Dam-Johansen

ECTS-point
25 - 35

Type
Kandidatspeciale

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Danmarks Tekniske Universitet (DTU) - hurtigt overblik


Danmarks Tekniske Universitet (DTU)
Danmarks Tekniske Universitet (DTU)
DTU er et teknisk eliteuniversitet med international rækkevidde og standard. Vores mission er at udvikle og nyttiggøre naturvidenskab og teknisk videnskab til gavn for samfundet. 11.200 studerende uddanner sig her til fremtiden, og 6.000 medarbejdere har hver dag fokus på uddannelse, forskning, myndighedsrådgivning og innovation, som bidrager til øget vækst og velfærd.

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