{"id":29214,"date":"2022-08-11T12:37:00","date_gmt":"2022-08-11T16:37:00","guid":{"rendered":"https:\/\/textiles.ncsu.edu\/?p=29214"},"modified":"2022-08-19T11:11:21","modified_gmt":"2022-08-19T15:11:21","slug":"new-method-can-remove-dyes-from-wastewater","status":"publish","type":"post","link":"https:\/\/textiles.ncsu.edu\/news\/2022\/08\/new-method-can-remove-dyes-from-wastewater\/","title":{"rendered":"New Method Can Remove Dyes From Wastewater"},"content":{"rendered":"\n

By Laura Oleniacz <\/p>\n\n\n\n

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.<\/p>\n\n\n\n

\u201cDyes are used everywhere, including in the textile industry, as well as in pharmaceuticals, cosmetics, paper, leather and even in medicines,\u201d said Januka Budhathoki-Uprety<\/a>, lead author of a paper on the work and an assistant professor at the Wilson College of Textiles. \u201cIf these contaminants aren\u2019t properly removed from wastewater after dyeing and finishing, they can be a significant source of environmental pollution and pose risks for human health.\u201d<\/p>\n\n\n\n

In the study, published<\/a> in ACS Applied Polymer Materials<\/em>, researchers made a synthetic polymer called polycarbodiimide. The researchers then tested the material\u2019s 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.<\/p>\n\n\n\n

\u201cWe 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,\u201d Budhathoki-Uprety said. \u201cThen 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.\u201d<\/p>\n\n\n\n

\"Dr.
Budhathoki-Uprety examines samples with the help of an undergraduate student from the department’s Research Experience for Undergraduates. <\/figcaption><\/figure>\n\n\n\n

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 \u2013 related to their molecular structures \u2013 that contributed to whether the polymer worked or not.<\/p>\n\n\n\n

\u201cWe 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,\u201d Budhathoki-Uprety said.<\/p>\n\n\n\n

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.<\/p>\n\n\n\n

\u201cWe are working to develop materials that can do the same work without having to use the polymer in the solution phase,\u201d Budhathoki-Uprety said. \u201cIf you have dye spill, you don\u2019t want to have to use a flammable solution \u2013 you want a solid material that is easier to handle.\u201d<\/p>\n\n\n\n

The study, \u201cPolycarbodiimide for Textile Dye Removal from Contaminated Water,\u201d was published online in ACS Applied Polymer Materials <\/em>on July 22, 2022. Co-authors included Meghan Lord, graduate student in Fiber and Polymer Science Program, and Graham Neve and Mike Keating, undergraduate students in the Textile Engineering, Chemistry and Science Department at NC State. The study was funded by the Textile Engineering, Chemistry and Science Department at NC State. Individual researchers were also supported by the Office of Undergraduate Research Federal Work Study Research Assistant Program at NC State.<\/p>\n\n\n\n

-oleniacz-<\/p>\n\n\n\n

Note to editors<\/strong>: The abstract follows.<\/p>\n\n\n\n

\u201cPolycarbodiimide for Textile Dye Removal from Contaminated Water\u201d<\/strong><\/p>\n\n\n\n

Authors<\/strong>: Meghan Lord, Graham Neve, Mike Keating and Januka Budhathoki-Uprety<\/p>\n\n\n\n

Published<\/em> online July 22, 2022, in ACS Applied Polymer Materials<\/em>.<\/p>\n\n\n\n

DOI: 10.1021\/acsapm.2c00959<\/p>\n\n\n\n

Abstract<\/strong>: Water pollution has been a significant challenge for the environment and human health. Dyes in water resources cause severe water pollution and block sunlight penetration through water, which impairs photosynthesis of aquatic plants as well as causes a significant alteration in ecological conditions of aquatic life. Dye-contaminated water sources can pose serious public health concerns, including toxicity, mutagenicity, and carcinogenicity among other adverse health effects. Therefore, it is imperative to develop efficient methods to remove dye contaminants from water sources. Synthetic polymers, due to their versatile chemical structure, size, and shape, could provide a tunable platform to remove dyes from contaminated sources. Herein, we report a polymer-mediated removal of textile dyes from aqueous solutions. A nitrogen-rich polymer, polycarbodiimide, efficiently removed anionic dyes from a dye-contaminated acidic solution. Upon dye removal, the polymer was regenerated through modulation of the solution pH. Further investigations showed that the polymer\u2019s ability to remove dyes was dependent on solution pH and the topological polar surface area of the dyes. Thus, the molecular mechanism for polymer\u2013dye interactions could be attributed to a combined ionic and hydrophobic interaction. The effects of pH, ionic strength, dye concentration, and composition were also investigated. Removal of dyes from contaminated aqueous resources is important in reducing environmental pollutants and mitigating environmental and health impacts. The findings from this study provide insights into the development of polymeric materials to remove soluble dyes from contaminated water to foster environmental and water sustainability.<\/p>\n\n\n\n

This post was originally published<\/a> in NC State News.<\/em><\/p>\n","protected":false,"raw":"\n\n\n\n\n

By Laura Oleniacz <\/p>\n\n\n\n

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.<\/p>\n\n\n\n

\u201cDyes are used everywhere, including in the textile industry, as well as in pharmaceuticals, cosmetics, paper, leather and even in medicines,\u201d said Januka Budhathoki-Uprety<\/a>, lead author of a paper on the work and an assistant professor at the Wilson College of Textiles. \u201cIf these contaminants aren\u2019t properly removed from wastewater after dyeing and finishing, they can be a significant source of environmental pollution and pose risks for human health.\u201d<\/p>\n\n\n\n

In the study, published<\/a> in ACS Applied Polymer Materials<\/em>, researchers made a synthetic polymer called polycarbodiimide. The researchers then tested the material\u2019s 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.<\/p>\n\n\n\n

\u201cWe 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,\u201d Budhathoki-Uprety said. \u201cThen 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.\u201d<\/p>\n\n\n\n

\"Dr.
Budhathoki-Uprety examines samples with the help of an undergraduate student from the department's Research Experience for Undergraduates. <\/figcaption><\/figure>\n\n\n\n

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 \u2013 related to their molecular structures \u2013 that contributed to whether the polymer worked or not.<\/p>\n\n\n\n

\u201cWe 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,\u201d Budhathoki-Uprety said.<\/p>\n\n\n\n

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.<\/p>\n\n\n\n

\u201cWe are working to develop materials that can do the same work without having to use the polymer in the solution phase,\u201d Budhathoki-Uprety said. \u201cIf you have dye spill, you don\u2019t want to have to use a flammable solution \u2013 you want a solid material that is easier to handle.\u201d<\/p>\n\n\n\n

The study, \u201cPolycarbodiimide for Textile Dye Removal from Contaminated Water,\u201d was published online in ACS Applied Polymer Materials <\/em>on July 22, 2022. Co-authors included Meghan Lord, graduate student in Fiber and Polymer Science Program, and Graham Neve and Mike Keating, undergraduate students in the Textile Engineering, Chemistry and Science Department at NC State. The study was funded by the Textile Engineering, Chemistry and Science Department at NC State. Individual researchers were also supported by the Office of Undergraduate Research Federal Work Study Research Assistant Program at NC State.<\/p>\n\n\n\n

-oleniacz-<\/p>\n\n\n\n

Note to editors<\/strong>: The abstract follows.<\/p>\n\n\n\n

\u201cPolycarbodiimide for Textile Dye Removal from Contaminated Water\u201d<\/strong><\/p>\n\n\n\n

Authors<\/strong>: Meghan Lord, Graham Neve, Mike Keating and Januka Budhathoki-Uprety<\/p>\n\n\n\n

Published<\/em> online July 22, 2022, in ACS Applied Polymer Materials<\/em>.<\/p>\n\n\n\n

DOI: 10.1021\/acsapm.2c00959<\/p>\n\n\n\n

Abstract<\/strong>: Water pollution has been a significant challenge for the environment and human health. Dyes in water resources cause severe water pollution and block sunlight penetration through water, which impairs photosynthesis of aquatic plants as well as causes a significant alteration in ecological conditions of aquatic life. Dye-contaminated water sources can pose serious public health concerns, including toxicity, mutagenicity, and carcinogenicity among other adverse health effects. Therefore, it is imperative to develop efficient methods to remove dye contaminants from water sources. Synthetic polymers, due to their versatile chemical structure, size, and shape, could provide a tunable platform to remove dyes from contaminated sources. Herein, we report a polymer-mediated removal of textile dyes from aqueous solutions. A nitrogen-rich polymer, polycarbodiimide, efficiently removed anionic dyes from a dye-contaminated acidic solution. Upon dye removal, the polymer was regenerated through modulation of the solution pH. Further investigations showed that the polymer\u2019s ability to remove dyes was dependent on solution pH and the topological polar surface area of the dyes. Thus, the molecular mechanism for polymer\u2013dye interactions could be attributed to a combined ionic and hydrophobic interaction. The effects of pH, ionic strength, dye concentration, and composition were also investigated. Removal of dyes from contaminated aqueous resources is important in reducing environmental pollutants and mitigating environmental and health impacts. The findings from this study provide insights into the development of polymeric materials to remove soluble dyes from contaminated water to foster environmental and water sustainability.<\/p>\n\n\n\n

This post was originally published<\/a> in NC State News.<\/em><\/p>\n"},"excerpt":{"rendered":"

Findings by researchers at the Wilson College of Textiles offer a new potential method for cleaning wastewater after use by textiles, cosmetics or other industries.<\/p>\n","protected":false},"author":12,"featured_media":29218,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"source":"","ncst_custom_author":"","ncst_show_custom_author":false,"ncst_dynamicHeaderBlockName":"ncst\/default-post-header","ncst_dynamicHeaderData":"{\"showAuthor\":true,\"showDate\":true,\"showFeaturedVideo\":false,\"displayCategoryID\":512,\"caption\":\"\"}","ncst_content_audit_freq":"","ncst_content_audit_date":"","footnotes":"","_links_to":"","_links_to_target":""},"categories":[742,512,479],"tags":[1143,504,1382],"displayCategory":{"term_id":512,"name":"Research and Innovation","slug":"research-and-innovation","term_group":0,"term_taxonomy_id":512,"taxonomy":"category","description":"","parent":0,"count":231,"filter":"raw"},"acf":[],"yoast_head":"New Method Can Remove Dyes From Wastewater - 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