In her PhD thesis, Silvia Larumbe-Abuin has developed nanostructures that assist in the process to decontaminate water.
The nanostructures (particles of a microscopic size of between 1 and 100 nanometres) are coated in titanium oxide to which nitrogen has been added. This allows sunlight, rather than ultraviolet radiation, to trigger the process involving the chemical reaction and destruction of contaminants.
Dissolution process of organic particles through nanoparticles
Nafarroako Unibertsitate Publikoa.
What is more, thanks to the magnetic nucleus of the particles, once the process has been carried out, they can be retrieved and reused. Silvia Larumbe’s thesis is entitled: “Síntesis, caracterización y aplicaciones de nanoestructuras basadas en óxidos de metales de transición” [Synthesis, characterisation and applications of nanostructures based on transition metal oxides].
The basis of the research conducted is the phenomenon known as photocatalysis: when light affects a substance that acts as a catalyst, the speed of the chemical reaction is increased. In this case, the light activates the titanium oxide and different oxidizing radicals are formed; the latter destroy the organic contaminants in the water, which could be colouring agents, solvents, detergents, etc.
As the author of the work explained, "it is a sustainable system that could be used as an alternative to different treatments used traditionally in waste water treatment and, specifically, to eliminate certain organic contaminants".
One of the advantages of this development is the possibility of using sunlight instead of ultraviolet light. “Since nitrogen is added to the coating of the particles, the mechanism that will trigger the process can be sunlight rather than ultraviolet radiation, which means a more accessible, less expensive alternative that poses fewer risks.”
The fact that structures of a nanometric size are used also improves photocatalytic capability since the surface of the photocatalyst is greater. Another advantage is the reuse of the catalysing component; since the nanostructures are formed using a magnetic nucleus, they can be retrieved by applying an external magnetic field.
Silvia Larumbe graduated in Chemistry at the University of Navarre, did a Master’s in Chemical Science and Technology at the UNED (Open University) and obtained her PhD in the Department of Physics of the NUP/UPNA. She has participated in over twenty or so national and international conferences, is the co-author of twelve research papers, and has participated in various research projects.
Oihane Lakar | Eurek Alert!
First evidence on the source of extragalactic particles
13.07.2018 | Technische Universität München
Simpler interferometer can fine tune even the quickest pulses of light
12.07.2018 | University of Rochester
For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.
To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...
For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.
Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...
Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.
A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...
Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.
"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....
Ultra-short, high-intensity X-ray flashes open the door to the foundations of chemical reactions. Free-electron lasers generate these kinds of pulses, but there is a catch: the pulses vary in duration and energy. An international research team has now presented a solution: Using a ring of 16 detectors and a circularly polarized laser beam, they can determine both factors with attosecond accuracy.
Free-electron lasers (FELs) generate extremely short and intense X-ray flashes. Researchers can use these flashes to resolve structures with diameters on the...
13.07.2018 | Event News
12.07.2018 | Event News
03.07.2018 | Event News
13.07.2018 | Event News
13.07.2018 | Materials Sciences
13.07.2018 | Life Sciences