a Self-cleaning fabrics decorated with titanium dioxide (TiO 2 ) nanoparticles (NPs) have garnered worldwide attention due to their outstanding ultraviolet (UV) light-shielding, anti-bacterial properties and other characteristics. Numerous techniques to construct super-antiwetting surfaces have been investigated for both fundamental research and practical application. A facile and eco-friendly way by a combination of UV irradiation and ultrasonic bath method has been developed to prepare a novel self-cleaning hybrid polyamine 6/nano TiO 2 (PA6/nano TiO 2 ) fabric with superhydrophobic and durable photocatalytic properties. To evaluate the fabric's reusability, hybrid PA6/nano TiO 2 fabrics were subjected to five consecutive cycles of the photocatalytic degradation of the methyl orange (MO) dye. The results indicated that TiO 2 NPs were firmly fixed on the fiber surface. The UV-blocking and anti-microbial properties of these hybrid fabrics were also tested. For PA6 immobilized by commercial nano TiO 2 -P25 (P25-PA6) and PA6 immobilized by prepared visible-light photocatalyst PVA D -TiO 2 (PVA D -PA6) fabrics, the UV protection factors (UPFs) of the samples were 56 and 1123, respectively. The anti-microbial efficacies of the two samples were both 99%. The water contact angles were 151.7 and 154.6 , respectively, indicating surface superhydrophobicity. These results showed that this novel fabric has great potential for indoor environmental purification and outdoor protection applications.

Al2O3 binders of various particle sizes were used to formulate a zeolite Y-based catalyst, and the acidity of catalysts increases with decreasing Al2O3 particle size. Characterization results showed that the amount and location of Al migration are related to the Al2O3 particle size, thus influencing the catalysts’ acidity and activity. In the proposed Al2O3–zeolites interaction scheme, the contact area increases with the decreasing Al2O3 particle size, which would increase the possibility of Al migration. Compared with microscale Al2O3, nanoscale Al2O3 particle is more likely to migrate to zeolites due to its great diffusivity into the zeolite. Catalysts formulated by nanoscale Al2O3 have better alkylation performance than those formulated by microscale Al2O3 because of their higher acidity. The research on zeolites–binder interaction would give inspirations to zeolite-based catalysts design and industrial application.

Increasing the SiO2 amount in the Al2O3 binder increased the Al migration from the binder into the zeolite, modifying the catalysts' acidic properties.