Fiber catalytic material for purifying formaldehyde gas and preparation method thereof

Abstract

The invention relates to a fiber catalytic material for purifying formaldehyde gas and a preparation method thereof. The fiber catalytic material is in a non-woven fabric shape and is formed after reaction of polyacrylonitrile non-woven fabric modified by hydroxylamine hydrochloride and iron ions, wherein the content of the iron ions is 15-270mg / g. The preparation method comprises the following steps: carrying out modification treatment on the polyacrylonitrile non-woven fabric by adopting the hydroxylamine hydrochloride, then carrying out reaction on the modified polyacrylonitrile non-woven fabric and aqueous solution of ferric chloride, and enabling the iron ions to be loaded on the polyacrylonitrile non-woven fabric by coordination action, thus obtaining the fiber catalytic material for purifying toxic and harmful gases such as the formaldehyde gas. The fiber catalytic material is applicable to a fiber-based filtering material of a core part in an air purifying system; and compared with the traditional nano TiO2 catalyst, the fiber catalytic material has the advantages of strong visible-light absorption, low preparation cost and easy recycling and the like, so that the fiber catalytic material has a potential application value.

Description

Technical field [0001] The invention belongs to the technical field of photocatalysis, and is specifically a fibrous catalytic material used in the field of purification of toxic and harmful gases such as formaldehyde and a preparation method thereof. Background technique [0002] Nano TiO 2 The representative photocatalytic oxidation technology can generate hydroxyl radicals with strong oxidation ability to completely remove toxic and harmful substances, thus becoming the most promising air purification technology. But nano TiO 2 There are still two important problems in the application of photocatalytic degradation of toxic and harmful gases: (1) TiO 2 The band gap is wide, and it can only absorb and utilize the ultraviolet light that accounts for only 3-5% of the sunlight. Although the absorption spectrum can be red-shifted by means such as element doping, it still has complex preparation processes and low visible light utilization. Insufficient; (2) Nano TiO 2 The powder is d...

AI Technical Summary

Problems solved by technology

But nano TiO 2 There are still two important problems in the application of photocatalytic degradation of toxic and harmful gases: (1) TiO 2 The band gap is wide, and it can only absorb and utilize ultraviolet light that only accounts for 3-5% of sunlight. Although the absorption spectrum can be red-shifted by element doping and other means, it still has complex preparation processes and low utilization of visible light. Insufficient; (2) Nano TiO 2 It is difficult to recycle the powder after application, and it has the characteristics of poor compatibility with the carrier when it is loaded on other materials, which may easily cause problems such as low fixation fastness and reduced activity after loading.

Literature [Ishtchenko VV, Huddersman KD, Vitkovskaya RF, Appl Catal A, 2003, 242, 123; Dong YC, Han ZB, Liu CY, Du F, Sci Total Environ, 2010, 408, 2245] and patents [Dong Yongchun, Han Zhenbang , Du Fang, Liu Chunyan, Patent No. CN101362102A] reported the preparation method and photocatalytic performance of polyacrylonitrile fiber-loaded iron complexes, but it is mainly used in the treatment of printing and dyeing wastewater, and does not involve toxic and harmful gas pollutants such as formaldehyde In the field of removal, and the fiber catalytic material used is yarn type, there are shortcomings such as poor mechanical properties, filterability and durability, which inhibits its industrial application in the field of air purification filter materials

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