Abstract
Different percentages of CuO and ZnO were added into a local kaolin ceramic-based powder (DD3) with and without ZrO2. The modified powders were first characterized, then, a test for the photocatalytic degradation of dyes with orange II (OII) was carried out. The DD3 powders that were obtained with the addition of ZrO2, ZnO, and CuO, were prepared by two different methods and have shown a large and very fast photocatalytic activity. Discoloration ratios of about 93.6% and 100% were reached after 15 min and 45 min, for CuO and ZnO respectively. Finally, an alternative photocatalysis mechanism, based purely on chemical reaction processes, is proposed. The photocatalysis results with modified powders are compared with the results obtained with thin films, made with the same materials.
Highlights
In recent years, the world has seen a large population growth and an increase in huge modern industries
Many works have already been published for valorizing these native raw materials for the production of ceramic membranes [3,4,5]
Since ceramic filters are generally constituted of a thick support (2000 μm) with mono or multi thin membranes, the replacement of the more expensive base materials, mentioned above, by other cheaper raw materials used in supports, is significantly important
Summary
The world has seen a large population growth and an increase in huge modern industries. The value of the pore sizes changed from 50 nm (without ZrO2 addition) to 292 nm (with ZrO2 addition) The addition of both zinc and copper oxides into the two types of ceramics has contributed significantly to the increase in the percentage of pores within the granules and induced the capture of a larger number of impurities in the dye. These two oxides changed the morphology of the DD3Z material and led them to become similar to flake-like structures with more pores, compared to raw DD3.
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