Lignin materials for adsorption: Current trend, perspectives and opportunities

Area of Science:

• Biomass valorization and materials science.
• Focus on sustainable and renewable resources.

Background:

• Lignin is an abundant, low-value aromatic biomass residue with underutilized potential.
• Current exploitation of lignin for materials is minimal (5%), indicating significant development opportunities.

Purpose of the Study:

• To review recent advancements in lignin-based adsorbent materials.
• To emphasize lignin modification and derived carbon materials for various applications.

Main Methods:

• Review of research on lignin-derived activated carbons for air pollutant adsorption.
• Analysis of modified lignin materials for removing organic dyes, heavy metals, and recovering noble metals.

Main Results:

• Lignin-derived activated carbons effectively adsorb air pollutants like CO2, SO2, and H2S.
• Modified lignin materials show promise in removing organic dyes, heavy metals (Cu, Zn, Pb, Cd), and recovering noble metals (Pd, Au, Pt).

Conclusions:

• Lignin is a versatile feedstock for developing high-value adsorbent materials.
• Green chemistry approaches can enhance lignin adsorbent development for added-value processes.