{"id":108141,"date":"2022-04-27T07:10:00","date_gmt":"2022-04-27T05:10:00","guid":{"rendered":"https:\/\/renewable-carbon.eu\/news\/?p=108141"},"modified":"2022-04-20T11:41:43","modified_gmt":"2022-04-20T09:41:43","slug":"method-efficiently-breaks-down-plastic-bottles-into-component-parts","status":"publish","type":"post","link":"https:\/\/renewable-carbon.eu\/news\/method-efficiently-breaks-down-plastic-bottles-into-component-parts\/","title":{"rendered":"Method efficiently breaks down plastic bottles into component parts"},"content":{"rendered":"\n\n\n

What if the life cycle of the plastic bottle was circular? Where a used plastic bottle was returned to its original components, ready to be made into a new plastic bottle instead of possibly ending up in a landfill.  <\/strong><\/p>\n\n\n\n

\"\"
Plastic bottle waste \u00a9 Northwestern University<\/figcaption><\/figure><\/div>\n\n\n\n

A Northwestern University research team is the first to demonstrate that a material called a metal-organic framework (MOF) is a stable and selective catalyst for breaking down polyester-based plastic into its component parts. <\/p>\n\n\n\n

Only three things are needed: plastic, hydrogen and the catalyst. An important bonus is that one of the component parts the plastic is broken down into is terephthalic acid, a chemical used to produce plastic. With the Northwestern method, it isn\u2019t necessary to go all the way back to oil and the expensive and energy-intensive production and separation of xylenes. <\/p>\n\n\n\n

\u201cWe can do a lot better than starting from scratch when making plastic bottles,\u201d said Omar Farha<\/a>, a professor of chemistry in the Weinberg College of Arts and Sciences<\/a>. He is the corresponding author of the study. \u201cOur process is much cleaner.\u201d<\/p><\/blockquote>\n\n\n\n

The work\u00a0was published recently<\/a>\u00a0in the\u00a0journal\u00a0Angewandte Chemie<\/em>.<\/p>\n\n\n\n

The researchers chose a\u00a0zirconium-based MOF called\u00a0UiO-66 because it is easy to make, scalable and inexpensive. Yufang Wu, the study\u2019s first author and a visiting graduate student in Farha\u2019s group, used the plastic that was most handy: the plastic water bottles her colleagues in the lab had discarded. She chopped them up, heated the plastic and applied the catalyst.<\/p>\n\n\n\n

\u201cThe MOF performed even better than we anticipated,\u201d Farha<\/strong> said. \u201cWe found the catalyst to be very selective and robust. Neither the color of the plastic bottle or the different plastic the bottle caps were made from affected the efficiency of the catalyst. And the method doesn\u2019t require organic solvents, which is a plus.\u201d<\/p><\/blockquote>\n\n\n\n

What are MOFs?<\/h3>\n\n\n\n

A class of nano-sized materials, MOFs have been widely investigated because of their highly ordered structures. Farha has studied MOFs for more than a decade and previously showed<\/a> they can be used to destroy toxic nerve agents. In the current study, Farha said, MOFs act in much the same way \u2014 breaking an ester bond to degrade polyethylene terephthalate (PET).  This plastic is one of the most popular consumer plastics worldwide.<\/p>\n\n\n\n

\u201cWe\u2019ve been using zirconium MOFs to degrade nerve agents for years,\u201d Farha<\/strong> said. \u201cThe team then wondered if these MOFs could also degrade plastic even though the reactions and mechanism are different. That curiosity led to our recent findings.\u201d<\/p>

\u201cThis research helps to address long-standing challenges associated with plastic waste and opens up new areas and applications for MOFs,\u201d Farha<\/strong> said.<\/p><\/blockquote>\n\n\n\n

Envision Tinkertoys<\/h3>\n\n\n\n

MOFs are made of organic molecules and metal ions or clusters which self-assemble to form multidimensional, highly crystalline, porous frameworks. To picture the structure of a MOF, Farha said, envision a set of Tinkertoys in which the metal ions or clusters are the circular or square nodes and the organic molecules are the rods holding the nodes together.<\/p>\n\n\n\n

In addition to being easy to make, scalable and inexpensive, another advantage of UiO-66 is that the MOF\u2019s organic linker, terephthalic acid (TA), is what you get when breaking down plastic.<\/p>\n\n\n\n

Structural characterization studies revealed that during the degradation process, UiO-66 undergoes an interesting transformation into another zirconium-based MOF called MIL-140A. This MOF also showed great catalytic activity toward PET degradation.<\/p>\n\n\n\n

Farha also is a member of Northwestern\u2019s International Institute for Nanotechnology<\/a>.<\/p>\n\n\n\n

The research was supported by the Inorganometallic Catalyst Design Center, an Energy Frontier Research Center funded by the Department of Energy, Office of Basic Energy Sciences (DE-SC0012702) and the National Science Foundation\u2019s Materials Research Science and Engineering Centersprogram (grant number NSF DMR-1720139).<\/p>\n\n\n\n

 The title of the paper is \u201cCatalytic Degradation of Polyethylene Terephthalate Using a Phase-Transitional Zirconium-Based Metal-Organic Framework<\/a>.\u201d <\/p>\n","protected":false},"excerpt":{"rendered":"

What if the life cycle of the plastic bottle was circular? Where a used plastic bottle was returned to its original components, ready to be made into a new plastic bottle instead of possibly ending up in a landfill.   A Northwestern University research team is the first to demonstrate that a material called a […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"none","nova_meta_subtitle":"Researchers first to demonstrate use of metal-organic frameworks to degrade plastics","footnotes":""},"categories":[17143],"tags":[15152,10416,11966,10453],"supplier":[1144,3930],"class_list":["post-108141","post","type-post","status-publish","format-standard","hentry","category-recycling","tag-catalyst","tag-circulareconomy","tag-plastics","tag-recycling","supplier-national-science-foundation-usa","supplier-northwestern-university"],"_links":{"self":[{"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/posts\/108141","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/comments?post=108141"}],"version-history":[{"count":0,"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/posts\/108141\/revisions"}],"wp:attachment":[{"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/media?parent=108141"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/categories?post=108141"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/tags?post=108141"},{"taxonomy":"supplier","embeddable":true,"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/supplier?post=108141"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}