Membrane separation combined with photocatalytic degradation has been proposed to tackle pollutants in wastewater, especially pharmaceutical micropollutants with low concentrations. TiO2 is one of the commonly used photocatalysts. However, due to its large band gap of around 3.20 eV only the small UV fraction of solar light, about 3% in energy, can be utilized. Therefore, novel photocatalysts which are active in visible light have been studied recently.
This work will focus on inkjet printing of a visible-light-active photocatalyst β- SnWO4. The first step of this work is the development of a suitable ink for the printing process and the adaption of the printing process itself. The catalyst will be firstly coated on glass substrate. Its reaction activity will be characterized by degradation of methyl orange with white LED light and compared with previous results of other catalysts. Then the catalyst has to be coated on ceramic nanofiltration membranes.
This work includes following tasks:
- Literature research on photocatalysis theory, visible light-driven photocatalytic degradation of pollutants, inkjet printing;
- Preparation of suitable inks with β- SnWO4 and development of suitable printing parameters;
- Characterization of the reactivity of the coated films by the model reaction of methyl orange degradation;
- Coating of the catalyst on ceramic nanofiltration membranes;
- Studying the hydraulic permeability and rejection of a model pollutant with coated nanofiltration membranes
The progress of this work will be regularly discussed within the two-weekly meeting of the group “catalytically active coatings”. The results of the work are to be presented within the seminar at IMVT (20 minutes oral presentation) and by a written thesis not exceeding 40 pages (excluding appendix).
Bonus: This work can be part of a paper to be submitted to a peer-reviewed journal (depending on the results).
Knowledge in chemical engineering.
Duration: 3 months
Language: English or German
Examiner: Prof. Dr. Roland Dittmeyer
Supervisor: M.Sc. Xiang Zhan
+49 721 608-26817