| Dyes are widely used,both in daily life and in industrial production,and they have greatly improved our lives.The main use of dyes is to color fabrics.However,these dyes are easily decolorized due to their low color fastness and poor fixation,resulting in serious water pollution.In recent years,these dyes have become the focus of wastewater management.In response to this problem,this paper has done the following aspects of work.(1)Because polymer dyes show higher color fastness than ordinary small molecule dyes,the molecular structure of dyes is changed,and chromophores are introduced into macromolecular chains.Using azo as the chromophore,small molecule functional dye monomers are obtained by reacting with acryloyl chloride,and then copolymerizing with octafluoropentyl methacrylate to obtain azo based polymer dyes;The structure and molecular weight of the prepared polymer dye were characterized,and the molecular weight of the obtained polymer dye was about 35000,with a molecular weight distribution of about 1.2.At the same time,stability tests were conducted on the fabric coated with dyes.Azo polymer dyes not only have their inherent color,but also have many excellent characteristics such as strong polymer stability,difficulty in decolorization,and resistance to acid and alkali.Since azobenzene groups can undergo protonation/deprotonation reaction under the stimulation of TFA/Et3 N,which leads to the visible color change of polymer dyes from light yellow to orange,such dyes also have the function of information storage.Polymer dyes were coated on different substrates,demonstrating stimulus responsiveness and cyclicity under alternating acid-base stimulation,resulting in high-resolution patterns that can be applied to intelligent information coatings for reversible writing.(2)Two polymer dyes with anthraquinone as the main chromophore were prepared.Firstly,1-aminoanthraquinone was used as the chromophore to carry out substitution reaction with acryloyl chloride to obtain functional dye monomer,and the monomer was copolymerized with trifluoroethyl methacrylate to obtain binary polymer dyes.Due to the large steric hindrance of quinone structure,the molecular weight of polymer dyes obtained was small;At the same time,the dyes do not contain affinity substances,which is not conducive to coating on the fabric.In order to improve adhesion,dopamine methylacrylamide with strong affinity was introduced to prepare ternary polymer dyes.The structure of polymer dyes was characterized,and the dyes were adhered to the fabric through a simple impregnation method.The modified fabric obtained has good hydrophobicity,hydrophobicity stability,and acid and alkali resistance.Secondly,a polymer dye with a molecular weight of15000 was prepared by copolymerization of 1-nitroanthraquinone as the chromophore with butyl acrylate.The coated fabric,acid alkali resistance,and washing resistance were tested,and the results showed that the modified dye impregnated fabric had excellent stability and washing resistance.In addition,the polymer dye can also exhibit visual color changes under acid-base stimulation.The dye monomer can change from rose red to purple under acid stimulation,and the polymer dye can change from rose red to yellow under acid stimulation.This color change has been finely characterized through graphical representation.Therefore,this dye can also be applied to reversible erasing intelligent information coatings.(3)Aiming at the water pollution caused by dye decolorization,a composite catalyst Fex O/AC was prepared,which introduced activated carbon based on the photocatalyst iron oxychloride.The high specific surface area and adsorption of activated carbon greatly improved the catalytic efficiency of the composite catalyst;Moreover,a degradation film has been made to greatly improve the secondary pollution caused by the non easy recovery of the catalyst during the degradation process. |
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