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Electrospun niobium oxide 1D nanostructures and their applications in textile industry wastewater treatment

Zaborowska Marta, Smok Weronika, Tański Tomasz

Bulletin of the Polish Academy of Sciences. Technical Sciences

2023

Vol. 71, nr 2

art. no. e144941

Textile industry emits daily huge amounts of sewage rich in non-biodegradable organic compounds, especially in textile dyes. Such contaminants are highly soluble in water, which makes their removal difficult. Other studies suggest their carcinogenicity, toxicity and mutagenicity. A promising chemical treatment of textile wastewater is the photodegradation of dye molecules in the process of photocatalysis in the presence of a photocatalyst. One-dimensional nanostructures exhibit a high surface-to-volume ratio and a quantum confinement effect, making them ideal candidates for nanophotocatalyst material. Nb2O5 is, among other metal oxides with a wide band gap, gaining popularity in optical applications, and electrospun niobium oxide nanostructures, despite their ease and low cost, can increase the chemical removal of textile dyes from wastewater. Facile synthesis of electrospun one-dimensional niobium oxide nanofibers is presented. The nanophotocatalysts morphology, structure, chemical bonds and optical properties were examined. Based on photodegradation of aqueous solutions (ph=6) of methylene blue and rhodamine B, the photocatalytic activity was established. The photocatalytic efficiency after 180 minutes of ultraviolet irradiation in the presence of Nb2O5 nanofibers was as follows: 84.9% and 31.8% for methylene blue and rhodamine B decolorization, respectively.

Annealing and hot deformation of Al-based composite hardened with niobium oxide dispersions.

Blaz L., Kaneko J., Sugamata M., Sierpiński Z., Tumidajewicz M.

Archives of Materials Science

2005

Vol. 26, nr 1-2

73-78

A brief review of structural investigation and results of mechanical tests for mechanically alloyed Al-based composites is presented. As an example, the effect of annealing temperature on the structure and properties of Al-Nb2O5 composite was discussed. It was found that chemical reaction between components during aging at 873 K resulted in an increase of material porosity. Opposite effect of the local volume increase due to intermetallic grain growth was not efficient enough to eliminate the porosity of the annealed material. Annealing of the composite at 873 K was found to result in material hardening. The hardness maximum was observed for samples annealed for 12 h at 873 K. Following softening at prolonged annealing time was ascribed to the grain coarsening and increased porosity of the composite. High strength of the composite, suspected from highly refined structure of the material, was proved by hot deformation tests at 623-903 K.