Ozone is formed when nitrogen oxide from exhausts is irradiated with UV light and releases an oxygen atom, which reacts with an oxygen molecule (O2) to form an ozone molecule (O3). A number of electrical devices, such as photocopiers and laser printers, also release this unhealthy gas.
In the journal Angewandte Chemie, a team led by Thomas Mathew and Kenichirou Suzuki at Toyota Central R&D Labs Inc. (Japan) report how they have now developed an iron oxide containing material that could lead to a new generation of ozone filters.
Ozone (O3) is a very dangerous air pollutant, irritating the airway and eyes as well as causing headaches. It also hinders plant growth and is believed to play a role in the die-off of forests. The typical “ozone smell” when using older photocopiers and laser printers is not the ozone itself: it is reaction products from the ozone. Most newer devices are equipped with filters that convert the ozone. Removal of O3 is essential for aircraft applications because O3 is an unavoidable pollutant at high altitude and can be introduced into the aircraft cabins during the flight.
Previous materials for the elimination of ozone have a number of disadvantages: for example, some require organic additives, others do not work without expensive metals, some are far from environmentally friendly, and most are not flexible enough for wide use in a variety of applications. The Japanese team has now reported a new, highly promising ozone trap: two-line ferrihydrite, a mineral composed of iron, oxygen, and water. The researchers produce it by a self-assembly process using various additives and solvents. The resulting highly porous material consists of tiny aggregated nanocrystals and its name is derived from the fact that when examined by X-ray diffraction, a technique for structure analysis, it shows two lines.
Why is two-line ferrihydrite such a good ozone catcher? Thanks to its pores and arrangement of nanoparticles, this material has a large and accessible inner surface. In comparison to other iron oxide materials, it has a particularly high proportion of unsaturated and thus reactive iron centers on its surface. These have fewer oxygen atoms as near neighbors than the iron atoms in the interior of the mineral. Such isolated iron oxide units absorb ozone especially well. Once bound to the iron, the ozone splits into an oxygen molecule (O2) and a highly reactive oxygen atom (O), which can react with a second lone oxygen atom to form O2.
This material could replace conventional ozone filters in electrostatic devices and aircraft applications. It can also be used for air-cleaner devices or as a filter in ventilation or air-conditioning ducts in offices and houses. In ozone processes for water cleaning and odor removal, e.g. smoke from vehicle interiors, it could catch the unreacted O3.
Angewandte Chemie International Edition 2011, 50, No. 32, Permalink to the article: http://dx.doi.org/10.1002/anie.201102007
Newly designed molecule binds nitrogen
23.02.2018 | Julius-Maximilians-Universität Würzburg
Atomic Design by Water
23.02.2018 | Max-Planck-Institut für Eisenforschung GmbH
A newly developed laser technology has enabled physicists in the Laboratory for Attosecond Physics (jointly run by LMU Munich and the Max Planck Institute of Quantum Optics) to generate attosecond bursts of high-energy photons of unprecedented intensity. This has made it possible to observe the interaction of multiple photons in a single such pulse with electrons in the inner orbital shell of an atom.
In order to observe the ultrafast electron motion in the inner shells of atoms with short light pulses, the pulses must not only be ultrashort, but very...
A group of researchers led by Andrea Cavalleri at the Max Planck Institute for Structure and Dynamics of Matter (MPSD) in Hamburg has demonstrated a new method enabling precise measurements of the interatomic forces that hold crystalline solids together. The paper Probing the Interatomic Potential of Solids by Strong-Field Nonlinear Phononics, published online in Nature, explains how a terahertz-frequency laser pulse can drive very large deformations of the crystal.
By measuring the highly unusual atomic trajectories under extreme electromagnetic transients, the MPSD group could reconstruct how rigid the atomic bonds are...
Quantum computers may one day solve algorithmic problems which even the biggest supercomputers today can’t manage. But how do you test a quantum computer to...
For the first time, a team of researchers at the Max-Planck Institute (MPI) for Polymer Research in Mainz, Germany, has succeeded in making an integrated circuit (IC) from just a monolayer of a semiconducting polymer via a bottom-up, self-assembly approach.
In the self-assembly process, the semiconducting polymer arranges itself into an ordered monolayer in a transistor. The transistors are binary switches used...
Breakthrough provides a new concept of the design of molecular motors, sensors and electricity generators at nanoscale
Researchers from the Institute of Organic Chemistry and Biochemistry of the CAS (IOCB Prague), Institute of Physics of the CAS (IP CAS) and Palacký University...
15.02.2018 | Event News
13.02.2018 | Event News
12.02.2018 | Event News
23.02.2018 | Physics and Astronomy
23.02.2018 | Health and Medicine
23.02.2018 | Physics and Astronomy