Chemistry 2011.org
Chemistry2011.org
All About Chemistry... 2011 and beyond

Related Stories

New decontamination tool expected to help Fukushima cleanup

An inexpensive and highly durable new material, it is hoped that Catenaccio PA will prove effective for treating contaminated water at the Fukushima Daiichi plant.

The Research Institute for Sustainable and Environmental Technology of Waseda University (RISET; Shinjuku Ward, Tokyo; Director: Prof. Masahiko Matsukata) and AZMEC Inc. (Headquarters: Mino City, Gifu Prefecture; President: Takenori Shoda) have successfully developed a new material for adsorbing radioactive elements such as cesium and strontium. An inexpensive and highly durable adsorbent, Catenaccio PA is a huge innovation over existing materials. With the Fukushima Daiichi Nuclear Power Station still facing the question of how to tackle the heavily contaminated discharge water at the plant, this highly versatile adsorbent, which is not only able to treat large volumes of contaminated water but which can also be used in other applications such as interim storage facilities for radioactive waste, is expected to have a far-reaching impact.

Traditional adsorbents for radioactive elements have been extremely expensive (costing tens of thousands of yen per kilogram); natural zeolite, by contrast, is low in cost but its adsorption performance is poor, and it also has been known to break down and lose effectiveness in highly alkaline environments such as ash. Catenaccio PA, however, is an inorganic polymer-based adsorbent made from silica and aluminum. As its raw materials are extremely low in cost (around 600 yen per kilogram) it is very easy to manufacture. It also has excellent acid resistance and alkali resistance. In addition, it can be used in interim storage facilities for long periods of time, lasting for at least 30 years before replacement is necessary.

RISET developed this material after its attention was drawn to the cation exchange capacity (CEC) of geopolymer, an inorganic substance which is used as a substitute for cement. Noting the material's CEC level, the researchers decided to make use of this feature. Catenaccio PA is expected to make a significant contribution towards improved safety not only through its use in the treatment of contaminated water from nuclear power plants but also in preventing radiation leaks from interim waste storage facilities currently being planned.

Test method: A liquid solution containing cations 0.1mol/L was prepared for each type. The inorganic polymer-based adsorbent was then added at a liquid-to-solid ratio of 500:1. After three hours, the solution was stirred and an adsorbency test performed. After the solids had been collected through filtration and cleaned with purified water, an EDS analysis was done to investigate the post-adsorbency test composition.

Story Source:

The above story is based on materials provided by Waseda University. Note: Materials may be edited for content and length.

Share this story with your friends!

Social Networking

Please recommend us on Facebook, Twitter and more:

Other social media tools

Global Partners
Feedback

Tell us what you think of Chemistry 2011 -- we welcome both positive and negative comments. Have any problems using the site? Questions?

About us

Chemistry2011 is an informational resource for students, educators and the self-taught in the field of chemistry. We offer resources such as course materials, chemistry department listings, activities, events, projects and more along with current news releases.

Events & Activities

Are you interested in listing an event or sharing an activity or idea? Perhaps you are coordinating an event and are in need of additional resources? Within our site you will find a variety of activities and projects your peers have previously submitted or which have been freely shared through creative commons licenses. Here are some highlights: Featured Idea 1, Featured Idea 2.

About you

Ready to get involved? The first step is to sign up by following the link: Join Here. Also don’t forget to fill out your profile including any professional designations.

Global Partners