High-selectivity magnetic dye adsorbent and preparation method thereof

Abstract

The invention discloses a high-selectivity magnetic dye adsorbent and a preparation method thereof. The preparation method comprises the following steps: preparation of magnetic nano-Fe3O4; preparation of nano-Fe3O4-SiO2; surface amino modification of nano-Fe3O4-SiO2; bromination modification of nano-Fe3O4-SiO2-NH2; preparation of nano-Fe3O4-SiO2-PGMA (polyglycidyl methacrylate); and Lysine modification of nano-Fe3O4-SiO2-PGMA. The adsorbent is larger in specific surface area and rich in bisexual activated adsorption sites; high-selectivity separation can be performed on an organic dye such aslemon yellow and methylene blue; the adsorbent is higher in adsorption capacity and high in adsorption rate; due to the characteristic of good magnetic response, cyclic regeneration of a material isensured, and secondary pollution to water bodies can be prevented, and therefore, the adsorbent has a considerable application prospect in the aspect of treatment of water pollution caused by the organic dye.

Description

technical field [0001] The invention relates to a high-selectivity magnetic dye adsorbent and a preparation method thereof, belonging to the field of synthesis of functional polymer materials. Background technique [0002] As an important part of water pollution, dye waste has become one of the deadly threats to the ecosystem. The existence of trace organic dyes is enough to cause obvious coloring of water bodies, thereby reducing the transmittance of sunlight in water, and further affecting the normal operation of water ecosystems including photosynthesis. More seriously, because most organic dyes contain complex structures such as aromatic hydrocarbons, their biodegradation process is relatively slow, and a large number of toxic, pathogenic and teratogenic organic dyes, especially azo dyes, will Accumulates in organisms through the food chain. Considering the severe situation mentioned above, the treatment of water pollution by organic dyes is imminent. [0003] In rece...

AI Technical Summary

Problems solved by technology

However, the disadvantages of traditional adsorbents, such as difficult recovery, limited adsorption capacity, low adsorption rate, and weak selectivity, still limit the widespread practical use of most adsorption methods.

For example, Chinese patent document CN105502564A discloses an adsorbent for selectively removing dyes containing sulfonic acid groups in wastewater and a preparation method thereof, using nanosheet-shaped basic copper nitrate as an adsorbent to remove dyes containing sulfonic acid groups in wastewater group of dyes; although the adsorbent has selectivity and high adsorption capacity for dyes containing sulfonic acid groups, the recovery process of the adsorbent is cumbersome and the recovery cost is high, and the single selectivity cannot be used for other types of dyes in wastewater. Effective adsorption and removal, while it may cause secondary pollution to water bodies

As another example, the Chinese patent document CN105664885A discloses a method for removing dyes using a pH-adjusted magnetic metal-organic framework material, and prepares Fe by co-precipitation 3 o 4 , and then modify its surface to generate silanized magnetic SiO 2 , and combined with metal-organic framework materials, in which metal-organic framework materials are constructed from aluminum and aminoterephthalic acid; by adjusting the pH value, the prepared magnetic metal-organic framework materials can be used as a new type of adsorbent , can adsorb different kinds of dyes; the magnetic metal-organic framework material prepared by this invention has the advantages of large specific surface area, high adsorption capacity, magnetic separation and regeneration, etc., but the adsorption capacity of this invention is limited and the adsorption rate is not good.

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