4.6 Article

Active microlignins derived from formic acid fractionation for adsorption of Pb(II)

Journal

MATERIALS LETTERS
Volume 333, Issue -, Pages -

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ELSEVIER
DOI: 10.1016/j.matlet.2022.133639

Keywords

Lignin; LMP; Lead; Adsorption; Metal ion

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This study demonstrates the preparation of lignin with abundant phenolic hydroxyls through formic acid fractionation and its application as an adsorbent for Pb(II). The resulting LMP had a mean size of 723.6 nm and exhibited a high adsorption capacity of 96.18 mg/g, surpassing other lignin-based adsorbents. It can be easily obtained from the black liquor of formic acid fractionation, indicating its potential for toxic metal ions adsorption.
This study reports the preparation of a lignin with abundant phenolic hydroxyls through formic acid fraction-ation and applied it to adsorb the Pb(II). It was found that the resultant LMP (lignin micro particle) had a mean size of 723.6 nm (polydispersity index = 0.956). The adsorption capacity of LMP to Pb(II) at equilibrium reached 96.18 mg/g, which was much higher than other origin lignin and even the modified lignin-based adsorbents. Besides, the LMP could be easily prepared from the black liquor of formic acid fractionation. These findings indicate that the formic acid LMP has a great potential to be used as adsorbents for toxic metal ions.

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