Study on the synthesis and fading behavior of azo dyes containing carboxyl ortho aromatic primary amine
To develop a new formaldehyde indicator elimination agent with high water solubility and strong formaldehyde elimination ability,the introduction of carboxyl groups was used to improve water solubility.An ortho aromatic primary amine azo dye C1 with carboxyl pyrazolone structure was designed and synthesized,and the molecular structure of the synthesized dye was determined by characterization methods such as mass spectrometry,infrared spectroscopy,and nuclear magnetic resonance spectroscopy.The article explored the influence of different pH values and temperature environmental conditions on the color fading reaction between C1 and formaldehyde,studied the selectivity of the color fading reaction between C1 and formaldehyde,and established a quantitative detection method for formaldehyde through the relationship curve between formaldehyde concentration and the absorbance of the dye solution after C1 color fading.The results show that at pH 2,C1 had the fastest fading reaction;within the range of 30～60 ℃,increasing the temperature can increase the rate of color fading reaction;C1 has good decolorization selectivity for formaldehyde.After decolorization,the absorbance of the dye solution shows a good linear relationship with formaldehyde concentration,and can quantitatively detect formaldehyde with a detection limit of 0.33 μg/mL.The synthesized dye C1 can undergo a sensitive fading reaction with formaldehyde.It also has good water solubility and can be used as an indicator for detecting formaldehyde and an elimination agent for formaldehyde.
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