Disperse dye is a category of synthetic dye intended for polyester and related hydrophobic fibers. Disperse dyes are polar molecules containing anthraquinone or azo groups. It is estimated that 85% of disperse dyes are azo or anthraquinone dyes.
The disperse dyes cause a risk of sensitization and elicitation to the body when colored clothes contact the body. However, during its manufacturing and dyeing also causes various environmental hazards.
As we all know, the world textile industry seriously discharges industrial wastewater from dye synthesis to printing and dyeing. Most of the dyes used in these fields are synthetic dyes; many toxic and harmful organic solvents are often used in the dyes’ synthesis processes. Meanwhile, a large amount of wastewater generated in the printing and dyeing processes is discharged into the environment, which causes severe environmental pollution. To reduce the environmental burden of the disperse dyes, researchers have introduced a new method using supercritical carbon dioxide.
The realization of synchronous synthesis and dyeing fabrics for fluorescent dyes in scCO2 is an effective way to prevent environmental pollution brought by the processes of synthesis and dyeing. Thus, the constructing and dyeing strategy of fluorescent dyes will benefit the sustainable development of the environment.
In this research work, three coumarin and 1,8-naphthalimide fluorescent dyes (DAMC, NP-NH, and NP-dimethyl) were successfully constructed based on the Au/titanium dioxide (Au/TiO2) catalytic reduction of nitro in scCO2.
Thus, this research paper could be a way to improve the dye manufacturing method and its application for a green environment.
