{"id":118950,"date":"2024-10-27T12:51:48","date_gmt":"2024-10-27T05:51:48","guid":{"rendered":"https:\/\/hotvideos24.online\/?p=118950"},"modified":"2024-10-27T12:51:48","modified_gmt":"2024-10-27T05:51:48","slug":"graphene-oxide-and-chitosan-sponge-found-to-be-ten-times-more-efficient-at-removing-gold-from-e-waste","status":"publish","type":"post","link":"https:\/\/hotvideos24.online\/?p=118950","title":{"rendered":"Graphene oxide and chitosan sponge found to be ten times more efficient at removing gold from e-waste"},"content":{"rendered":"<p> <script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-3711241968723425\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-layout-key=\"-fb+5w+4e-db+86\"\r\n     data-ad-client=\"ca-pub-3711241968723425\"\r\n     data-ad-slot=\"7910942971\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><br \/>\n<\/p>\n<div>\n<div class=\"article-gallery lightGallery\">\n<div data-thumb=\"https:\/\/scx1.b-cdn.net\/csz\/news\/tmb\/2024\/graphene-oxide-and-chi.jpg\" data-src=\"https:\/\/scx2.b-cdn.net\/gfx\/news\/hires\/2024\/graphene-oxide-and-chi.jpg\" data-sub-html=\"SEM image of Au&lt;sup&gt;3+&lt;\/sup&gt; extraction and reduction by GO\/Chitosan sponge; Au&lt;sup&gt;3+&lt;\/sup&gt; is shown in yellow. Credit: Kou Yang\">\n<figure class=\"article-img\">\n            <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/scx1.b-cdn.net\/csz\/news\/800a\/2024\/graphene-oxide-and-chi.jpg\" alt=\"Graphene oxide and chitosan sponge found to be ten times more efficient at removing gold from e-waste\" title=\"SEM image of Au3+ extraction and reduction by GO\/Chitosan sponge; Au3+ is shown in yellow. Credit: Kou Yang\" width=\"800\" height=\"529\"\/><figcaption class=\"text-darken text-low-up text-truncate-js text-truncate mt-3\">\n                SEM image of Au<sup>3+<\/sup> extraction and reduction by GO\/Chitosan sponge; Au<sup>3+<\/sup> is shown in yellow. Credit: Kou Yang<br \/>\n            <\/figcaption><\/figure>\n<\/p><\/div>\n<\/div>\n<p>A team of chemists and materials scientists at the National University of Singapore, working with colleagues from Manchester University, in the U.K., and Guangdong University of Technology, in China, has developed a type of sponge made of graphene oxide and chitosan, that can be used to extract gold from electronic waste.<\/p>\n<p>In their paper <a href=\"https:\/\/pnas.org\/doi\/10.1073\/pnas.2414449121\" target=\"_blank\" rel=\"noopener\">published<\/a> in the <i>Proceedings of the National Academy of Sciences<\/i>, the group describes how they made their sponge and how well it worked during testing.<\/p>\n<p>Prior research has shown that removing <a href=\"https:\/\/phys.org\/tags\/gold\/\" rel=\"tag\" class=\"textTag\">gold<\/a>, silver and other metals from <a href=\"https:\/\/phys.org\/tags\/electronic+equipment\/\" rel=\"tag\" class=\"textTag\">electronic equipment<\/a> that is no longer useful, as a way to recycle such materials, is a difficult and often dirty business. Quite often it results in low yields and the generation of a variety of toxic pollutants.<\/p>\n<p>In this new study, the research team has found a way to remove the gold in a way that is cheaper and cleaner than conventional methods and much more efficient as well.<\/p>\n<p>The research team chose their materials purposely\u2014both have been used to extract gold from other materials. Also, graphene has a demonstrated ability to absorb <a href=\"https:\/\/phys.org\/tags\/ions\/\" rel=\"tag\" class=\"textTag\">ions<\/a>, and chitosan (a natural biopolymer) is a well-known reducing agent, which in this case was used to catalytically convert gold ions into their solid form.<\/p>\n<p>The two materials were made into a composite by allowing the chitosan to self-assemble on two-dimensional graphene flakes\u2014a process that also resulted in the formation of sites on the material that could bind to gold ions. After the gold ions are absorbed into the graphene, the chitosan converts them into their solid gold state, allowing for easy collection\u2014a process the research team describes as highly efficient.<\/p>\n<p>The team tested their sponge using real e-waste provided by a recycling company. The e-waste came in the form of a solution mixture, which meant it had been ground up with other materials present in the electronic equipment and mixed into a liquid. Measurement prior to treatment showed gold concentrations of 3 ppm.<\/p>\n<p>The newly developed sponge was able to extract approximately 17g\/g of Au<sup>3+<\/sup> ions and a little more than 6 g\/g of Au<sup>+<\/sup>. Such amounts, the team claims, are approximately 10 times that of any other known extraction process.<\/p>\n<div class=\"article-main__more p-4\">\n<p><strong>More information:<\/strong><br \/>\n\t\t\t\t\t\t\t\t\t\t\t\tKou Yang et al, Graphene\/chitosan nanoreactors for ultrafast and precise recovery and catalytic conversion of gold from electronic waste, <i>Proceedings of the National Academy of Sciences<\/i> (2024). <a data-doi=\"1\" href=\"https:\/\/dx.doi.org\/10.1073\/pnas.2414449121\" target=\"_blank\" rel=\"noopener\">DOI: 10.1073\/pnas.2414449121<\/a><\/p>\n<\/p><\/div>\n<p class=\"article-main__note mt-4\">\n\t\t\t\t\t\t\t\t\t\t\t\t  \u00a9 2024 Science X Network\n\t\t\t\t\t\t\t\t\t\t\t <\/p>\n<p>\t\t\t\t\t\t\t\t\t\t<!-- print only --><\/p>\n<div class=\"d-none d-print-block\">\n<p>\n\t\t\t\t\t\t\t\t\t\t\t\t<strong>Citation<\/strong>:<br \/>\n\t\t\t\t\t\t\t\t\t\t\t\tGraphene oxide and chitosan sponge found to be ten times more efficient at removing gold from e-waste (2024, October 26)<br \/>\n\t\t\t\t\t\t\t\t\t\t\t\tretrieved 27 October 2024<br \/>\n\t\t\t\t\t\t\t\t\t\t\t\tfrom https:\/\/phys.org\/news\/2024-10-graphene-oxide-chitosan-sponge-ten.html\n\t\t\t\t\t\t\t\t\t\t\t <\/p>\n<p>\n\t\t\t\t\t\t\t\t\t\t\t This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no<br \/>\n\t\t\t\t\t\t\t\t\t\t\t part may be reproduced without the written permission. The content is provided for information purposes only.\n\t\t\t\t\t\t\t\t\t\t\t <\/p>\n<\/p><\/div>\n<\/p><\/div>\n<p><script id=\"facebook-jssdk\" async=\"\" src=\"https:\/\/connect.facebook.net\/en_US\/sdk.js\"><\/script><br \/>\n<br \/><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-3711241968723425\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-layout-key=\"-fb+5w+4e-db+86\"\r\n     data-ad-client=\"ca-pub-3711241968723425\"\r\n     data-ad-slot=\"7910942971\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><br \/>\n<br \/><div data-type=\"_mgwidget\" data-widget-id=\"1660802\">\r\n<\/div>\r\n<script>(function(w,q){w[q]=w[q]||[];w[q].push([\"_mgc.load\"])})(window,\"_mgq\");\r\n<\/script>\r\n<br \/>\n<br \/><a href=\"https:\/\/phys.org\/news\/2024-10-graphene-oxide-chitosan-sponge-ten.html\">Source link <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>SEM image of Au3+ extraction and reduction by GO\/Chitosan sponge; Au3+ is shown in yellow. Credit: Kou Yang A team of chemists and materials scientists at the National University of &hellip; <a href=\"https:\/\/hotvideos24.online\/?p=118950\" class=\"more-link\">Read More<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8628],"tags":[],"class_list":["post-118950","post","type-post","status-publish","format-standard","hentry","category-science","entry"],"_links":{"self":[{"href":"https:\/\/hotvideos24.online\/index.php?rest_route=\/wp\/v2\/posts\/118950","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hotvideos24.online\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hotvideos24.online\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hotvideos24.online\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/hotvideos24.online\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=118950"}],"version-history":[{"count":0,"href":"https:\/\/hotvideos24.online\/index.php?rest_route=\/wp\/v2\/posts\/118950\/revisions"}],"wp:attachment":[{"href":"https:\/\/hotvideos24.online\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=118950"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hotvideos24.online\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=118950"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hotvideos24.online\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=118950"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}