Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Effective Cesium Radioisotope Removal

23.05.2014

Novel vanadosilicate is potential decontamination agent for cesium-tainted water

The Fukushima reactor disaster has been the most recent incident to introduce the public to the concept of “cesium 137”. In the journal Angewandte Chemie, Korean researchers have now introduced a new vanadosilicate that can remove cesium from contaminated coolant water, liquid nuclear waste, and contaminated ground- and seawater more effectively than conventional sorbents.


Cs-137 is among the most dangerous radioactive nuclides. It has a half-life of 30 years, so contaminated areas remain polluted for a long time. The high solubility of cesium salts in water facilitates its dispersal in the environment and its uptake by plants. If humans ingest this contaminated food, the body cannot differentiate the cesium from potassium, so the toxin is stored in muscle tissue. Larger amounts can cause severe radiation sickness; smaller amounts can cause diseases like cancer.

The removal of Cs-137 from contaminated ground- and seawater, as well as liquid nuclear waste from reprocessing and nuclear energy plants is correspondingly critical for public health. The problem is the very high relative concentrations of competing cations like sodium, calcium, magnesium, and potassium ions—which make necessary a highly effective and selective cesium trap. A wide variety of inorganic materials have been developed, although there has been no substantial progress in the last 20 years. To date, titanosilicates have worked best, and these were put into use after the Fukushima reactor disaster.

Kyung Byung Yoon and a team from Sogang University in Seoul, South Korea have now developed a new material named as “Sogang University-45” (or SGU-45 for short) that very effectively binds and immobilizes cesium from groundwater, seawater, and liquid nuclear waste. Under the test conditions used, in concentrations of 10 ppb to 100 ppm, SGU-45 was shown to be superior to all previous materials with regard to selectivity, capacity, and rate of absorption. Strikingly, unlike other materials, the selectivity of K-SGU-4, the variant loaded with potassium ions, to cesium increases as the cesium concentration decreases.

SGU-45 is a special, microporous vanadosilicate with vanadium ions in the 4+ and 5+ oxidation states. K-SGU-45 was best suited for the removal of cesium from contaminated groundwater and seawater, as well as strongly acidic or basic nuclear waste. The cesium ions absorbed replace the potassium ions in K-SGU-45. The framework of SGU-45 already carries non-exchangeable cesium ions which are 16-coordinate, meaning that they have 16 neighboring atoms bonded to cesium. This observation is of academic interest because this is the highest coordination number (the number of nearest neighbors in a crystal lattice or complex) yet observed in chemistry.

About the Author

Dr. Kyung Byung Yoon is Professor of Chemistry at Sogang University, Seoul, Korea. He is also the Director of the Korea Center for Artificial Photosynthesis. He has been working in the area of zeolite research for the last 30 years. He is the recipient of the Korea Science Award and the Academic Award from the National Academy of Science, Korea.

Author: Kyung Byung Yoon, Sogang University, Seoul (Rep. Korea), http://hompi.sogang.ac.kr/zeolite/eyoon.htm

Title: A Novel Vanadosilicate with Hexadeca-Coordinated Cs+ Ions as a Highly Effective Cs+ Remover

Angewandte Chemie International Edition, Permalink to the article: http://dx.doi.org/10.1002/anie.201402778

Dr. Kyung Byung Yoon | Angewandte Chemie

Further reports about: Fukushima cesium concentration concentrations ions materials potassium reactor zeolite

More articles from Life Sciences:

nachricht An evolutionary heads-up – The brain size advantage
22.05.2015 | Veterinärmedizinische Universität Wien

nachricht Endocrine disrupting chemicals in baby teethers
21.05.2015 | Goethe-Universität Frankfurt am Main

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Basel Physicists Develop Efficient Method of Signal Transmission from Nanocomponents

Physicists have developed an innovative method that could enable the efficient use of nanocomponents in electronic circuits. To achieve this, they have developed a layout in which a nanocomponent is connected to two electrical conductors, which uncouple the electrical signal in a highly efficient manner. The scientists at the Department of Physics and the Swiss Nanoscience Institute at the University of Basel have published their results in the scientific journal “Nature Communications” together with their colleagues from ETH Zurich.

Electronic components are becoming smaller and smaller. Components measuring just a few nanometers – the size of around ten atoms – are already being produced...

Im Focus: IoT-based Advanced Automobile Parking Navigation System

Development and implementation of an advanced automobile parking navigation platform for parking services

To fulfill the requirements of the industry, PolyU researchers developed the Advanced Automobile Parking Navigation Platform, which includes smart devices,...

Im Focus: First electrical car ferry in the world in operation in Norway now

  • Siemens delivers electric propulsion system and charging stations with lithium-ion batteries charged from hydro power
  • Ferry only uses 150 kilowatt hours (kWh) per route and reduces cost of fuel by 60 percent
  • Milestone on the road to operating emission-free ferries

The world's first electrical car and passenger ferry powered by batteries has entered service in Norway. The ferry only uses 150 kWh per route, which...

Im Focus: Into the ice – RV Polarstern opens the arctic season by setting course for Spitsbergen

On Tuesday, 19 May 2015 the research icebreaker Polarstern will leave its home port in Bremerhaven, setting a course for the Arctic. Led by Dr Ilka Peeken from the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI) a team of 53 researchers from 11 countries will investigate the effects of climate change in the Arctic, from the surface ice floes down to the seafloor.

RV Polarstern will enter the sea-ice zone north of Spitsbergen. Covering two shallow regions on their way to deeper waters, the scientists on board will focus...

Im Focus: Gel filled with nanosponges cleans up MRSA infections

Nanoengineers at the University of California, San Diego developed a gel filled with toxin-absorbing nanosponges that could lead to an effective treatment for skin and wound infections caused by MRSA (methicillin-resistant Staphylococcus aureus), an antibiotic-resistant bacteria. This "nanosponge-hydrogel" minimized the growth of skin lesions on mice infected with MRSA - without the use of antibiotics. The researchers recently published their findings online in Advanced Materials.

To make the nanosponge-hydrogel, the team mixed nanosponges, which are nanoparticles that absorb dangerous toxins produced by MRSA, E. coli and other...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

International symposium: trends in spatial analysis and modelling for a more sustainable land use

20.05.2015 | Event News

15th conference of the International Association of Colloid and Interface Scientists

18.05.2015 | Event News

EHFG 2015: Securing health in Europe. Balancing priorities, sharing responsibilities

12.05.2015 | Event News

 
Latest News

Mesoporous Particles for the Development of Drug Delivery System Safe to Human Bodies

22.05.2015 | Materials Sciences

Computing at the Speed of Light

22.05.2015 | Information Technology

Development of Gold Nanoparticles That Control Osteogenic Differentiation of Stem Cells

22.05.2015 | Materials Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>