Smog Eating Graphene Compound Developed
Graphene Flagship partners the University of Bologna, Politecnico di Milano, CNR, NEST, Italcementi HeidelbergCement Group, the Israel Institute of Technology, Eindhoven University of Technology, and the University of Cambridge have developed a graphene-titania photocatalyst that degrades up to 70% more atmospheric nitrogen oxides (NOx) than standard titania nanoparticles in tests on real pollutants.
Atmospheric pollution is a growing problem, particularly in urban areas and in less developed countries. According to the World Health Organization, one out of every nine deaths 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.
Credit: Marys_Photos; Pixabay
To address the problem, researchers are continually on the hunt for new ways to remove more pollutants from the atmosphere, and photocatalysts such as titania are a great way to do this. When titania is exposed to sunlight, it degrades nitrogen oxides – which are very harmful to human health – and volatile organic compounds present at the surface, oxidising them into inert or harmless products.
Now, the Graphene Flagship team working on photocatalytic coatings, coordinated by Italcementi, HeidelbergCement Group, Italy, developed a new graphene-titania composite with significantly more powerful photodegradation properties than bare titania.
The photocatalyst degrades up to 70% more atmospheric nitrogen oxides (NOx) than standard titania nanoparticles in tests on real pollutants.
Credit: Italcementi / Heidelberg Cement / Graphene Flagship
By performing liquid-phase exfoliation of graphite – a process that creates graphene – in the presence of titania nanoparticles, using only water and atmospheric pressure, they created a new graphene-titania nanocomposite that can be coated on the surface of materials to passively remove pollutants from the air. If the coating is applied to concrete on the street or on the walls of buildings, the harmless photodegradation products could be washed away by rain or wind, or manually cleaned off.
To measure the photodegradation effects, the team tested the new photocatalyst against NOx and recorded a sound 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.
Ultrafast transient absorption spectroscopy measurements revealed an electron transfer process from titania to the graphene flakes, decreasing the charge recombination rate and increasing the efficiency of reactive species photoproduction – meaning more pollutant molecules could be degraded.
Xinliang Feng, Graphene Flagship Work Package Leader for Functional Foams and Coatings, explains: “Photocatalysis in a cementitious matrix, applied to buildings, could have a large effect to decrease air pollution by reducing NOx and enabling self-cleaning of the surfaces – the so-called “smog-eating” effect. Graphene could help to improve the photocatalytic behaviour of catalysts like titania and enhance the mechanical properties of cement.
Enrico Borgarello, Global Product Innovation Director at Italcementi, part of the HeidelbergCement Group, one of the world’s largest producers of cement, comments: “Integrating graphene into titania to create a new nanocomposite was a success. The nanocomposite showed a strong improvement in the photocatalytic degradation of atmospheric NOx boosting the action of titania. This is a very significant result, and we look forward to the implementation of the photocatalytic nanocomposite for a better quality of air in the near future.”
The reasons to incorporate graphene into concrete do not stop here. Italcementi is also working on another product – an electrically conductive graphene concrete composite, which was showcased at Mobile World Congress in February this year. When included as a layer in flooring, it could release heat when an electrical current is passed through it. Goisis comments: “You could heat your room, or the pavement, without using water from a tank or boiler. This opens the door to innovation for the smart cities of the future – particularly to self-sensing concrete,” which could detect stress or strain in concrete structures and monitor for structural defects, providing warning signals if the structural integrity is close to failure.
Andrea C. Ferrari, Science and Technology Officer of the Graphene Flagship and Chair of its Management Panel, adds: “An ever-increasing number of companies are now partners, or associate members of the Graphene Flagship, since they recognize the potential for new and improved technologies. In this work, Italcementi, leader in Italy in the field of building materials, demonstrated a clear application of graphene for the degradation of environment pollutants. This can not only have commercial benefits, but, most importantly, benefit of society by resulting in a cleaner and healthier environment.”
Contacts and sources:
Citation: Photocatalytic activity of exfoliated graphite–TiO2 nanoparticle composites
Please Help Support BeforeitsNews by trying our Natural Health Products below!
Join our affiliate program and earn extra money by sharing with friends and family or by posting on your social media.
Order by Phone at 888-809-8385 or online at www.mitocopper.com
Get our Free Ebook, "Suppressed Health Secrets" with Natural Cures THEY don't want you to know!
APeX - Far superior to colloidal silver! Destroys Viruses, Bacteria, Pathogens with Oxygen plus Silver!
Supreme Fulvic - Nature's most important supplement! Vivid Dreams again!
Ultimate Curcumin - Natural pain relief, reduce inflammation and so much more.
pathogens and gives you more
energy. (See Blood Video)
Oxy Powder - Natural Colon Cleanser! Cleans out toxic buildup with oxygen!
Organic Hemp Extract (CBD) - Full Spectrum high CBD (3300mg) hemp extract eases stiff joints, relieves stress and more!
Nascent Iodine - Promotes detoxification, mental focus and thyroid health.
Smart Meter Cover - Reduces Smart Meter radiation by 96%! (See Video)
FINAL WARNING! Diseases are EXPLODING! Watch this Video about APeX and You'll THROW AWAY Your Colloidal Silver! APeX destroys Viruses, Bacteria and other Pathogens with the power of Oxygen PLUS Silver! Nobody else has a product like THIS! See why the inventor hasn't been sick in 16 years and why you'll never hear about it on the FAKE NEWS! Get some now and tell your friends about it too so we can reach more people!