Synthetic polymer can remove dyes from wastewater
North Carolina State University researchers have demonstrated that a reusable synthetic polymer can remove dyes from water.
Water and Wastewater Insights
- Researchers from NC State found that using a new synthetic polymer to clean wastewater resulted in the successful removal of dyes. The polymer solution was able to remove most of the dyes found in the contaminated water during testing and it can be recollected from the clean water and reused.
- Dyes are used across multiple industries, and are a known source of pollution and health risks for humans. Equated to oil and water, researchers performed visual tests to study the synthetic polymer, and discovered that it grabs onto the dyes and then is later able to be separated through a draining process.
- Researchers plan to create a library of polymers, and work towards using more practical and non-flammable solutions.
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 first by dissolving it in a solvent, and then mixing it with water contaminated with dyes. They tested the polymer solution against a series of 20 anionic dyes, also called acid dyes, which are used in the textile industry. For initial assessments, the researchers did a visual test with the naked eye to see if the polymer worked. The researchers later quantified how well the polymer removed the colorant using UV-Vis spectroscopy.
“We mixed the polymer solution and dye-contaminated water so the polymer in the solution can grab on to 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. “Then we were able to easily separate the clean water from the contaminated solution mixture by draining it out, similar to 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 develop 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 have to use a flammable solution – you want a solid material that is easier to handle.”
– Edited by Morgan Green, associate editor, CFE Media and Technology, email@example.com.