Dyes like Congo red and methyl orange create brightly hued shirts, sweaters and dresses. But these commonly used azo dyes can be toxic, carcinogenic and are hard to remove from wastewater.
David Chem, a University of Arkansas chemical engineering Ph.D. candidate, developed an environmentally friendly solution to remove these dyes using a common byproduct of the pulp and paper industry the University announced in a release Monday.
Azo dyes are used in 60-70% of commercial textile production. The dyes dissolve easily in water and resist biodegradation, which makes them an environmental hazard. The runoff from garment plants has the highest concentration of azo dyes, but they also end up in municipal wastewater from washing clothes.
