Adsorption of Metal Ions on Crosslinked Lignosulphonic Acid

INOUE Katsutoshi, OHTO Keisuke, OSHIMA Tatsuya, ONISHI Sayaka, MAKINO Kenjiro

doi:10.1252/kakoronbunshu.30.822

Adsorption gel was prepared by using formaldehyde to crosslink lignosulphonic acid, which is generated in the production of pulp as a by-product of low value or nearly waste. The amount of cation-exchangeable hydrogen ion contained in the gel was measured by titration as 4.83 mol/kg-dry gel, the majority of which was considered to be attributed to hydroxyl groups of phenol moiety of the gel.<br>Batchwise adsorption tests were carried out to elucidate the pH dependency of the adsorption of some metal ions and adsorption isotherms. Adsorption occurred at pH greater than 2 and increased with increasing pH, suggesting that cationic metal ions are adsorbed on the gel by a cation exchange mechanism. The order of the selectivity was as follows: La(III)>Pb(II)∼Fe(III)>Fe(II)∼Cu(II)∼Al(III)>Cd(II)∼Ni(II)>Mn(II)∼Zn(II). The adsorption isotherms were of the Langmuir-type, and the maximum adsorption capacity was evaluated as 0.86, 0.76 and 0.47 mol/kg-dry gel for copper(II), lead(II) and lanthanum(III).<br>With a view to practical use of this gel, the separation of lead(II) from zinc(II) was examined using a column packed with the gel. Satisfactory separation was achieved, suggesting the feasibility of applying the gel to, for example, the removal of lead impurity from a zinc plating bath.

Adsorption of Metal Ions on Crosslinked Lignosulphonic Acid

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