open access

https://hdl.handle.net/2115/44073

Adsorption of Heavy Metal Ions to Floc-Type Biosorbents

英語

heavy metals

2002-05-15

Elsevier

Journal of Colloid and Interface Science

249(2)

295-300

Adsorption of cadmium and lead ions to floc-type biosorbents was reported in this work. Two types of biosorbents containing a marine microalga, Heterosigma akashiwo (Hada) Hada or a purple non-sulfur bacterium, Rhodobacter sphaeroides were prepared. The microorganisms inactivated by steam sterilization were immobilized in casein floc and cross-linked with glutaraldehyde. In the present immobilizing method, we obtained the biosorbents comprising as much as 67% of microorganism on a dry-weight basis. Simple metal binding models were applied to explain the adsorption mechanism of bivalent metal ions to the biosorbents. The results showed that casein acted as both the immobilizing material and the adsorbent material. The adsorption of bivalent metal ions to the biosorbents was due to bidentate binding to the acidic sites on casein and monodentate binding to the acidic sites on microorganisms. The metal binding constants and the binding capacities of microorganisms were scarcely influenced by immobilization.

学術雑誌論文

Accepted Manuscript

0021-9797

AA00695804