Antimicrobial activity of geopolymers ion-exchanged with copper ions

Geopolymers made from metakaolin and an alkali solution were immersed in a 0.1mol/L copper chloride solution for 24h. After the solution treatment, the surface color of the geopolymers changed to green to a depth of 900μm due to ion exchange with copper ions. To evaluate the antimicrobial activity o...

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Bibliographic Details
Published in:Ceramics international 2015-12, Vol.41 (10), p.13788-13792
Main Authors: Hashimoto, Shinobu, Machino, Tatsuya, Takeda, Hayami, Daiko, Yusuke, Honda, Sawao, Iwamoto, Yuji
Format: Article
Language:English
Subjects:
Antimicrobial activity
Copper ions
Geopolymers
Oyster mushroom
Rot fungi
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Summary:Geopolymers made from metakaolin and an alkali solution were immersed in a 0.1mol/L copper chloride solution for 24h. After the solution treatment, the surface color of the geopolymers changed to green to a depth of 900μm due to ion exchange with copper ions. To evaluate the antimicrobial activity of the colored portion of the geopolymer, it was ground into 500μm particles and mixed with a 10:1 mass ratio of oyster mushroom (a wood-rot fungus) and sawtooth oak sawdust. This mixture was placed in a glass bottle at room temperature and 100% relative humidity for one week. The results revealed that the geopolymer ion-exchanged with copper ions suppressed the growth of oyster mushrooms in sawtooth oak sawdust, indicating antimicrobial activity.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2015.08.061