A filter for environmental remediation


Seaweed-like sodium titanate mat for Co2+ removal

Osaka, Japan - A team of researchers at Osaka University has developed a nanopowder shaped like seaweed for a water filter to help remove toxic metal ions (Fig. 1). Made of layered sodium titanate, the randomly oriented nanofibers increase the efficacy of cobalt-II (Co2+) ion capture. This work might lead to cheaper and more effective solutions for filtering water that is currently unusable due to hazardous heavy metals or radioactive fallout.


As the global population continues to increase, so will the need for drinkable water. Sadly, many water sources have become contaminated with heavy metals, such as cobalt, from industrial waste or radioactive runoff. Sodium titanate has been widely used to filter out these toxic substances, but its efficiency is not enough. Sodium titanate is generally a two-dimensional layered material, but its crystal structure can vary based on the chemical composition and preparation method. To effectively capture radioactive and/or heavy metal ions, the morphological control of the sodium titanate is very important.


Now, researchers from the Institute of Scientific and Industrial Research at Osaka University have developed a new method to create highly efficient sodium titanate filters. "We used a template-free alkaline hydrothermal process to produce the mats," first author Yoshifumi Kondo says. The researchers found that increasing the hydrothermal synthesis time caused the initially round crystals to become elongated and fibrous, and to form the seaweed-shaped mats consisting of the randomly oriented nanofibers (Fig. 2). This seaweed-like nanoscale morphology increased the surface area of the mats, which improved the removal efficiency of Co2+ during sorption tests.


"Due to the progress of global warming and serious environmental pollution, the need for safe ways to remove radioactive materials and heavy metals from water resources has become even more critical," senior author Tomoyo Goto says. Compared with a commercially available material, the nanostructured sodium titanate mats showed improved performance for capturing Co2+ ions. The method is expected to be applied for other purification systems that remove heavy metals and radionuclides from wastewater (Fig. 3).


Reference

Sorption capacity of seaweed-like sodium titanate mats for Co2+removal

Yoshifumi Kondo, Tomoyo Goto and Tohru Sekino

https://doi.org/10.1039/D0RA06662A


Contact

Tomoyo Goto

The Institute of Scientific and Industrial Research (ISIR)

Osaka University

goto@sanken.osaka-u.ac.jp

 

STAY CURRENT WITH THE NWA NEWSLETTER DELIVERED TO YOUR INBOX.

FOUNDING MEMBERS

NTU Singapore develops oral insulin nanoparticles that could be an alternative to jabs

How does your computer smell?

As hard as a diamond and as deformable as metal

Clocking the movement of electrons inside an atom

In lab study, nanoparticle shows promising results for treating severe allergies

Pivotal discovery in quantum and classical information processing

Flashing plastic ash completes recycling