Journal
APPLIED SURFACE SCIENCE
Volume 457, Issue -, Pages 644-654Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.06.287
Keywords
Titanium dioxide; Metallic mesh; Organic and inorganic additives; Photocatalysis; Contaminants of emerging concern; Nonylphenol ethoxylate
Categories
Funding
- CNPq
- FAPERGS
- FINEP
- CAPES
- CAPG-BA from Brazil [73/14 490]
- ANPCyT
- CONICET
- CAPG-BA [73/14]
- UNL from Argentina
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This contribution describes the influence of the ratio of polyvinyl alcohol (PVA), TiO2 and wire opening of metal meshes for the construction of a structured catalyst with a uniform coating, that present high adherence and photocatalytic activity. The best coating results were observed for a PVA/TiO2 mass ratio of 0.37 and mesh opening of 546 mu m. This coating exhibited a uniform distribution, high adherence and the maintenance of anatase and rutile phases. These aspects can be related to three variables: (i) the structure of the stainless-steel metal mesh, (ii) the thermal pretreatment and (iii) the amount of organic additive (PVA/TiO2 ratio) employed in the suspensions. The most important achievement of this work was the fabrication of a structured catalyst with excellent stability, without losing activity for the degradation of endocrine-disrupting nonylphenol ethoxylate (NP4EO) in synthetic solution, without poisoning of the catalytic surface. In fact, the results showed that even with a real wastewater matrix, a high photocatalytic activity for NP4EO degradation (91%) was obtained, meaning that this structured catalyst can be applied to solve serious environmental problems as the contamination by endocrine-disrupting NP4EO, without subsequent catalyst recovery and recycle steps.
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