{"id":47944,"date":"2019-12-09T21:11:05","date_gmt":"2019-12-09T19:11:05","guid":{"rendered":"https:\/\/www.csregypt.com\/?p=47944"},"modified":"2019-12-09T21:11:05","modified_gmt":"2019-12-09T19:11:05","slug":"cambridge-university-graphene-composite-developed-to-eat-environmental-pollutants","status":"publish","type":"post","link":"https:\/\/csregypt.com\/en\/cambridge-university-graphene-composite-developed-to-eat-environmental-pollutants\/","title":{"rendered":"Cambridge University: Graphene composite developed to “eat” environmental pollutants"},"content":{"rendered":"

Cambridge University said an international group of scientists, including from the University of Cambridge, have developed a graphene composite that can \u2018eat\u2019 common atmospheric pollutants, and could be used as a coating on pavements or buildings.<\/p>\n

Working in collaboration with the Italcementi HeidelbergCement Group and other partners, the Cambridge scientists developed a photocatalyst that degrades up to 70% more atmospheric nitrogen oxides (NOx) than standard titania nanoparticles in tests on real pollutants.<\/p>\n

Atmospheric pollution is a growing problem, particularly in urban areas and in developing countries. According to the World Health Organization,\u00a0one out of every nine deaths<\/a>\u00a0worldwide can be attributed to diseases caused by air pollution. Organic pollutants, such as nitrogen oxides and volatile compounds, are the main cause of this, and they are mostly emitted by vehicle exhausts and industry.<\/p>\n

While researchers are developing new technologies and energy sources that will drastically reduce the volume of pollutants emitted into the atmosphere in the first place, they are also on the hunt for new ways to remove more pollutants from the atmosphere. Photocatalysts such as titania are one way to do this. When titania is exposed to sunlight, it degrades harmful nitrogen oxides and volatile organic compounds present at the surface, oxidising them into inert or harmless products.<\/p>\n

Now, in a study published in the journal\u00a0Nanoscale<\/em>, the researchers demonstrated that a composite of titania and graphene \u2013 a two-dimensional form of carbon – has significantly more powerful photodegradation properties than bare titania.<\/p>\n

Researchers from the Cambridge Graphene Center prepared and tested the composite, confirming its ability to photocatalytically degrade pollutant molecules, then researchers at Italcementi applied the coating to concrete to investigate its potential for environmental remediation.<\/p>\n

\u201cWe decided to couple graphene to the most-used photocatalyst, titania, to boost the photocatalytic action,\u201d said co-author Marco Goisis from Italcementi. \u201cPhotocatalysis is one of the most powerful ways we have to depollute the environment because the process does not consume the photocatalysts. It is a reaction activated by solar light.\u201d<\/p>\n

By performing liquid-phase exfoliation of graphite \u2013 a process that creates graphene \u2013 in the presence of titania nanoparticles, using only water and atmospheric pressure, the scientists created the new graphene-titania nanocomposite.<\/p>\n

They found that it passively removes pollutants from the air when coated on the surface of materials. If applied to concrete on the street or the walls of buildings, the harmless photodegradation products could be washed away by rain or wind, or manually cleaned off.<\/p>\n

To measure the photodegradation effects, the team tested the new photocatalyst against NOx\u00a0and recorded a 70% improvement in photocatalytic degradation of nitrogen oxides compared to standard titania. They also used rhodamine B as a model for volatile organic pollutants, as its molecular structure closely resembles those of pollutants emitted by vehicles, industry and agriculture. They found that 40% more rhodamine B was degraded by the graphene-titania composite than by titania alone, in water under UV irradiation.<\/p>\n

\u201cCoupling graphene to titania gave us excellent results in powder form \u2013 and it could be applied to different materials, of which concrete is a good example for the widespread use, helping us to achieve a healthier environment. It is low-maintenance and environmentally friendly, as it just requires the sun\u2019s energy and no other input,\u201d said Goisis.<\/p>\n

But there are challenges to be addressed before this can be used on a commercial scale. Cheaper methods to mass-produce graphene are needed. Interactions between the catalyst and the host material need to be deepened as well as studies into the long-term stability of the photocatalyst in the outdoor environment.<\/p>\n

\u201cAn ever-increasing number of companies recognize\u00a0the potential for graphene in new and improved technologies,\u201d said Professor Andrea Ferrari, Director of the Cambridge Graphene Center. \u201cThis work has demonstrated a clear application of graphene for the degradation of environmental pollutants. This can not only have commercial benefits but, more importantly, a cleaner and healthier environment.\u201d<\/span><\/p>\n

 <\/p>\n

\"\"<\/p>\n","protected":false},"excerpt":{"rendered":"

Cambridge University said an international group of scientists, including from the University of Cambridge, have developed a graphene composite that can \u2018eat\u2019 common atmospheric pollutants, and could be used as a coating on pavements or buildings. Working in collaboration with the Italcementi HeidelbergCement Group and other partners, the Cambridge scientists developed a photocatalyst that degrades […]<\/p>\n","protected":false},"author":410,"featured_media":47945,"comment_status":"open","ping_status":"open","sticky":true,"template":"","format":"standard","meta":{"footnotes":""},"categories":[984,6030],"tags":[6549,6559,6402],"yoast_head":"\nCambridge University: Graphene composite developed to "eat" environmental pollutants - Csr Egypt<\/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:\/\/csregypt.com\/en\/cambridge-university-graphene-composite-developed-to-eat-environmental-pollutants\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cambridge University: Graphene composite developed to "eat" environmental pollutants - Csr Egypt\" \/>\n<meta property=\"og:description\" content=\"Cambridge University said an international group of scientists, including from the University of Cambridge, have developed a graphene composite that can \u2018eat\u2019 common atmospheric pollutants, and could be used as a coating on pavements or buildings. 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