Binding of heavy metal ions by chemically modified woods

✍ Scribed by Mitsuhiro Morita; Mitsuo Higuchi; Isao Sakata

• Publisher: John Wiley and Sons
• Year: 1987
• Tongue: English
• Weight: 548 KB
• Volume: 34
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1987.070340312

✦ Synopsis

Three chemically modified woods were prepared and used for the binding of heavy metal ions.

Wood-polyethylenimine composite (wood-PEI) was found to be effective for the adsorption of heavy metal ions such as Hg2+, Cu2+, and other metal ions which tend to form stable ammine complexes. Adsorption of metal ions on a wood-PEI derivative containing dithiocarbamate group (DTC-wood) was higher than that by wood-PEI. Especially, the reactivity of DTC-wood with Hg2+ was quite high and the binding capacity of about 5 mmol/g was easily attainable. The rate of adsorption on these wood-based adsorbents was very high, and adsorption of about 70% of total binding capacity was accomplished in the first 1 h. This may be due to a highly porous structure and a hydrophilic nature of the wood which constitutes the skeleton of the adsorbents. Amidoximated wood (AO-wood) prepared by the reaction of cyanoethylated wood with hydroxylamine showed selective adsorptivity for uranium in sea water. More than 531 of uranium in the sea water used was adsorbed by the AO-wood.