New method can remove dyes from wastewater

North Carolina State University researchers have demonstrated that a synthetic polymer can remove certain dyes from water and that the polymer can be recovered and reused.

North Carolina State University researchers have demonstrated that a synthetic polymer can remove certain dyes from water and that the polymer can be recovered and reused.

The findings offer a new potential method for cleaning wastewater after use by textiles, cosmetics or other industries.

“Dyes are used everywhere, including in the textile industry, as well as in pharmaceuticals, cosmetics, paper, leather and even in medicines,” said Januka Budhathoki-Uprety, lead author of a paper on the work and an assistant professor of textile engineering, chemistry and science at NC State. “If these contaminants aren’t properly removed from wastewater after dyeing and finishing, they can be a significant source of environmental pollution and pose risks for human health.”

In the study published in ACS Applied Polymer Materials, researchers made a synthetic polymer called polycarbodiimide. The researchers then tested the material’s ability to clean wastewater. They started by dissolving it in a solvent and mixing it with water contaminated with dyes. They tested the polymer solution against a series of 20 anionic dyes, also called acid dyes, used in the textile industry. The researchers did a visual test with the naked eye for initial assessments to see if the polymer worked. The researchers later quantified how well the polymer removed the colourant using UV-Vis spectroscopy.

Polymer can remove dyes before recovering and reusing the polymer

“We mixed the polymer solution and dye-contaminated water so the polymer in the solution can grab onto the dye. This is a two-phase solution, just like oil and water. The polymer part of the solution grabs onto the dyes,” Budhathoki-Uprety said. “We could easily separate the clean water from the contaminated solution mixture by draining it out. It is similar to the separation of water from a mixture of oil and water.”

The polymer solution removed all but four of the 20 acid dyes they tested. In addition, they found it was easy to recover the polymer within minutes. They found characteristics of the dyes—related to their molecular structures—that contributed to whether the polymer worked or not.

“We found that the polymer solution can remove dyes from contaminated water, and we can recover the polymer and use it to remove dye from contaminated water again,” Budhathoki-Uprety said.

In future studies, researchers are planning to develop a library of polymers that would have the potential to work with more types of dyes. In addition, they want to build a more practical mechanism for using polycarbodiimide to clean wastewater.

“We are working to develop materials that can do the same work without having to use the polymer in the solution phase,” Budhathoki-Uprety said. “If you have dye spill, you don’t want to use a flammable solution. You want a solid material that is easier to handle.”

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