Specialty Fabrics Review November 2022 - 13

Polymer can remove dyes from wastewater
N
orth 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 results offer a new 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, " says Januka Budhathoki-Uprety, lead researcher
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. "
Researchers made a synthetic polymer and tested its 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.
" The polymer part of the solution grabs onto the dyes, " Budhathoki-Uprety says. " Then
we were able to easily separate the clean water from the contaminated solution mixture. "
The polymer solution removed all but four of the 20 acid dyes tested. In addition, researchers
found it was easy to recover the polymer to use again.
The left vial shows dye
solution in water (blue)
and the right vial shows
clear water after the
dye was removed from
the solution by the
polymer. Photo: Januka
Budhathoki-Uprety
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Specialty Fabrics Review November 2022

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Specialty Fabrics Review November 2022 - Cover1
Specialty Fabrics Review November 2022 - Cover2
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