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 Modern genetic sequencing tools give clearer picture of how corals are related
17.08.2017 | University of Washington

nachricht The irresistible fragrance of dying vinegar flies
16.08.2017 | Max-Planck-Institut für chemische Ökologie

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Fizzy soda water could be key to clean manufacture of flat wonder material: Graphene

Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.

As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...

Im Focus: Exotic quantum states made from light: Physicists create optical “wells” for a super-photon

Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.

Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...

Im Focus: Circular RNA linked to brain function

For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.

While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...

Im Focus: RAVAN CubeSat measures Earth's outgoing energy

An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.

The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...

Im Focus: Scientists shine new light on the “other high temperature superconductor”

A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.

Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Call for Papers – ICNFT 2018, 5th International Conference on New Forming Technology

16.08.2017 | Event News

Sustainability is the business model of tomorrow

04.08.2017 | Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

 
Latest News

Gold shines through properties of nano biosensors

17.08.2017 | Physics and Astronomy

Greenland ice flow likely to speed up: New data assert glaciers move over sediment, which gets more slippery as it gets wetter

17.08.2017 | Earth Sciences

Mars 2020 mission to use smart methods to seek signs of past life

17.08.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>