The aim of the presentation is to assess the suitability of used filters from drinking water treatment for the preparation of composite catalyst precursors. These materials can be used as catalysts to remove gaseous pollutants from waste gases. Precursor making, physicochemical analysis and catalytic tests can help assess whether these materials can contribute positively to environmental protection and waste management. In this case, the filters used for tap water - instead of being thrown into the garbage - can be reused. These activities will reduce the amount of garbage in landfills and provide one of the materials to make air purifiers. Comparative tests of physicochemical properties of a new filter, a worn filter and a worn filter subjected to further adsorption under various conditions were carried out. As part of physicochemical tests, the following were performed: sieve analysis, determination of pH of water extract, determination of ash content, determination of methylene number, determination of iodine adsorption number and chlorine leaching. After comparing the results of all samples, it can be concluded that further adsorption of compounds on used filters is possible. This is confirmed by similar results of the adsorption number of iodine consumption filter and samples of the A and B series. An additional advantage is the fact that the pH of the water extraction of the used and new filter differ slightly and is close to the neutral pH, which means that the chemical nature of the filter does not change after its wear. The ash content test showed that the used filter contains a very large amount of inorganic compounds, mainly derived from the adsorption of compounds responsible for boiler scale on ion exchange resin. Due to the fact that these compounds, as well as the entire ion exchange resin, do not participate in the process of creating catalysts, they are superfluous. It is possible to separate activated carbon (it is the main catalyst precursor) from the resin, which was demonstrated by sieve analysis. The above conclusions may confirm the thesis that used water filters are suitable for processing and making catalyst precursors. In the further stage of the research, carbonization and activation of precursors with steam and carbon dioxide were carried out. Then, in order to determine the properties of catalysts, their specific surfaces and porosity were determined. Catalytic tests were carried out. The resulting materials after modification can be used as waste gas purification catalysts.
Audience Takeaway Notes:
- Reuse of water filters can improve environmental protection
- These are studies that can be extended to other types of filters and used for teaching work in the field of catalysis, environmental protection or energy
- Research shows practical solutions to optimize the process of producing catalysts from used filters