Block-structured N/S-TiO2 material as well as preparation method and application thereof

Abstract

The invention provides a blocky structure N / S-TiO2 material, which is prepared by the following steps of: preparing a mixed solvent from N, N-dimethylformamide and methanol according to a ratio, heating 2-aminoterephthalic acid and tetrabutyl titanate serving as raw materials at 120-160 DEG C for 20-24 hours to synthesize a metal organic framework Ti8O8 (OH) 4 (C8H3O4-NH2) 6, mixing the metal organic framework Ti8O8 (OH) 4 (C8H3O4-NH2) 6 with inorganic sulfur powder according to a ratio, calcining at 500-700 DEG C, and drying to obtain the blocky structure N / S-TiO2 material. The nitrogen and sulfur doped nanoscale titanium dioxide material is obtained, and the nitrogen and sulfur doped nanoscale titanium dioxide material is expressed as N / S-TiO2. The material has a square microstructure of a precursor Ti8O8 (OH) 4 (C8H3O4-NH2) 6, the length and width of a square block are 400-600 nm, the height of the square block is 200-300 nm, the square structure is complete, and particle protrusions are slightly shown on the surface of the square structure. The material has excellent catalytic performance when being used as a catalyst for photocatalytic degradation of formaldehyde.

Description

technical field [0001] The invention belongs to the field of photocatalytic degradation of air pollutants, and in particular relates to a block-shaped nano-photocatalyst and a preparation method and application thereof. Background technique [0002] Formaldehyde is an easily accessible volatile organic pollutant that is widely used in furniture, sheet metal, paint, and adhesives, which leads to the constant risk of formaldehyde in the indoor environment. Formaldehyde has been identified by the World Health Organization as a carcinogenic and teratogenic substance, especially for children's eyes, respiratory system and even intelligence. [0003] Among the many treatment methods, the photocatalytic method stands out due to its advantages of clean energy, efficient degradation ability and no secondary pollution, and has made great achievements in the field of air pollution treatment. As a classic photocatalyst, titanium dioxide has the advantages of low cost, stable physical a...

AI Technical Summary

Problems solved by technology

As a classic photocatalyst, titanium dioxide has the advantages of low cost, stable physical and chemical properties, and ideal optical performance. However, there are also defects such as easy aggregation and deactivation of small molecular particles, and serious coincidence of active photogenerated carriers, which inhibits its broad application prospects.

[0005] CN101301606A discloses a kind of preparation technology of doped titanium dioxide photocatalyst, has prepared doping ion as Sn by microemulsion-hydrothermal method 4+ 、Cr 3+ 、Ag + 、Au + , Pb 2+ 、Pt 2+ , La 3+ 、Ce 4+ Doped titanium dioxide, the doping elements used in this method are mostly heavy metals or noble metals, the cost is high and may not be environmentally degradable, the synthesis process is relatively complicated and the prepared titanium dioxide particles may be seriously agglomerated

However, observing the electron microscope shows that the small particles are seriously agglomerated, and the final removal rate is only about 30%, the poor performance may be attributed to the agglomerated small particles covering a large number of active sites

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