{"id":4346,"date":"2007-03-05T22:40:01","date_gmt":"2007-03-05T22:40:01","guid":{"rendered":"http:\/\/blogs.thesocialmedia.com\/leblogenergie\/2007\/03\/05\/photosynthse-ar\/"},"modified":"2012-07-12T09:51:43","modified_gmt":"2012-07-12T09:51:43","slug":"photosynthse-ar","status":"publish","type":"post","link":"https:\/\/blogs.thesocialmedia.com\/leblogenergie\/2007\/03\/05\/photosynthse-ar\/","title":{"rendered":"Photosynth\u00e8se artificielle"},"content":{"rendered":"<p><span class=\"style95\"><a href=\"http:\/\/blogs.thesocialmedia.com\/leblogenergie\/files\/2012\/07\/300pxleaf_1_web1.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"250\" height=\"187\"  src=\"http:\/\/blogs.thesocialmedia.com\/leblogenergie\/files\/2012\/07\/300pxleaf_1_web.jpg\" alt=\"300pxleaf_1_web\" style=\"margin: 0px 5px 5px 0px;float: left\" \/><\/a> Une \u00e9quipe de chercheurs de l&rsquo;universit\u00e9 de Kyoto a d\u00e9velopp\u00e9 un mat\u00e9riau qui pourrait \u00eatre utilis\u00e9 pour reproduire \u00e0 bas co\u00fbt la photosynth\u00e8se.<br \/>A grande \u00e9chelle, il y a donc possibilit\u00e9 de recr\u00e9er ce que fait la nature (les plantes): transformer le CO2 de l&rsquo;Air en sucres, \u00e0 l&rsquo;aide de la lumi\u00e8re. Ce la permettrait donc par exemple:<br \/>1. absorber le CO2. Il faudra donc placer ce syst\u00e8me proche des sources importantes de CO2 (qui est un gaz \u00e0 effet de serre). Les lieux privil\u00e9gi\u00e9s sont donc les usines, etc &#8230; o\u00f9 la concentration de CO2 peut \u00eatre importante. L&rsquo;utilisation &quot;embarqu\u00e9e&quot; dans les transports est aussi envisageable.<br \/>2. produire des sucres, transformables facilement en \u00e9thanol par exemple, et donc en carburant.<br \/><\/span><span class=\"style95\"><br \/><\/span><\/p>\n<p><span class=\"style95\">Pour arriver \u00e0 ce r\u00e9sultat, cette \u00e9quipe utilise du dioxyde de mangan\u00e8se tr\u00e8s pur, dispers\u00e9 en particules de taille de plusieurs nanom\u00e8tres, permettant de rendre ce mat\u00e9riaux tr\u00e8s r\u00e9actifs pour la photosynth\u00e8se (jusqu&rsquo;\u00e0 300 fois plus que la photosnth\u00e8se naturelle selon les auteurs).<\/p>\n<p>L&rsquo;utilisation de Mangan\u00e8se a le gros avantage de donner un produit bon march\u00e9, au vu du faible co\u00fbt de la mati\u00e8re premi\u00e8re (quelques EUROS par kg). <br \/>Il reste donc \u00e0 certifier le proc\u00e9d\u00e9 et \u00e0 le rendre op\u00e9rationnel au point de vue industriel.<\/p>\n<p>La d\u00e9couverte est en tous cas tr\u00e8s prometteuse !!<\/p>\n<p><strong>Au point de vue de la toxicit\u00e9 du Mangan\u00e8se:<\/strong><br \/>Ben, oui, il faut bien se poser la question ! <br \/>Le Mangan\u00e8se est un oligo-\u00e9l\u00e9ment n\u00e9cessaire \u00e0 l&rsquo;homme, mais qui peut devenir toxique en trop grande quantit\u00e9.<br \/>&quot;Les besoins journaliers pour un adulte sont de 2 \u00e0 3 mg. La limite de s\u00e9curit\u00e9 d\u00e9finie par l\u2019<a title=\"Afssa\" href=\"http:\/\/www.afssa.fr\/\">Afssa<\/a> (Agence fran\u00e7aise de s\u00e9curit\u00e9 sanitaire) est de 4,2 \u00e0 10 mg par jour. Un exc\u00e8s de mangan\u00e8se se traduit par des troubles du syst\u00e8me nerveux.&quot; (source: wikipedia)<\/span><\/p>\n<p>Il n&rsquo;y a donc pas a priori de toxicit\u00e9, ce qui est un atout tr\u00e8s int\u00e9ressant !<br \/><span class=\"style95\"><br \/> Sources:<br \/> <a href=\"http:\/\/www.bulletins-electroniques.com\/actualites\/41547.htm\">ADIT<\/a><br \/> <a href=\"http:\/\/www.rish.kyoto-u.ac.jp\/W\/LIH\/koyanaka2.html\">page du <\/a><\/span><a href=\"http:\/\/www.rish.kyoto-u.ac.jp\/W\/LIH\/koyanaka2.html\"><span class=\"style85\">Dr. Koyanaka<\/span><\/a> (en Japonais)<br \/> <span class=\"style95\">Wikipedia<br \/> illustration: Free Public Domain Photo Database, <a href=\"http:\/\/pdphoto.org\/PictureDetail.php?mat=pdef&amp;pg=5528\">PD Photo.org<\/a><br \/> <\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Une \u00e9quipe de chercheurs de l&rsquo;universit\u00e9 de Kyoto a d\u00e9velopp\u00e9 un mat\u00e9riau qui pourrait \u00eatre utilis\u00e9 pour reproduire \u00e0 bas co\u00fbt la photosynth\u00e8se.A grande \u00e9chelle, il y a donc possibilit\u00e9 de recr\u00e9er ce que fait la nature (les plantes): transformer le CO2 de l&rsquo;Air en sucres, \u00e0 l&rsquo;aide de la lumi\u00e8re. Ce la permettrait donc [&hellip;]<\/p>\n","protected":false},"author":342,"featured_media":5080,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,335,13,10],"tags":[],"class_list":["post-4346","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","category-recherche","category-science","category-solaire"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Photosynth\u00e8se artificielle - leblogenergie.com<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.thesocialmedia.com\/leblogenergie\/2007\/03\/05\/photosynthse-ar\/\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Photosynth\u00e8se artificielle - leblogenergie.com\" \/>\n<meta name=\"twitter:description\" content=\"Une \u00e9quipe de chercheurs de l&rsquo;universit\u00e9 de Kyoto a d\u00e9velopp\u00e9 un mat\u00e9riau qui pourrait \u00eatre utilis\u00e9 pour reproduire \u00e0 bas co\u00fbt la photosynth\u00e8se.A grande \u00e9chelle, il y a donc possibilit\u00e9 de recr\u00e9er ce que fait la nature (les plantes): transformer le CO2 de l&rsquo;Air en sucres, \u00e0 l&rsquo;aide de la lumi\u00e8re. 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