Humic acid desorption from a positively charged nanocellulose surface

Area of Science:

• Materials Science
• Environmental Science
• Biochemistry

Background:

• Positively charged cellulose nanofibers (CNF) are effective biobased sorbent materials.
• Understanding sorption and desorption is crucial for material applications.

Purpose of the Study:

• Investigate humic acid (HA) desorption from CNF.
• Determine factors influencing HA desorption kinetics and extent.
• Assess the potential for CNF filter regeneration.

Main Methods:

• Batch and continuous filtration experiments were conducted.
• Desorption was studied across various pH and ionic strengths.
• Humic acid coverage on CNF was systematically varied.

Main Results:

• Increased pH and ionic strength enhanced HA desorption.
• Higher CNF coverage with HA and presence of free HA influenced desorption.
• Desorption kinetics were faster under specific conditions.

Conclusions:

• Humic acid desorption from CNF is pH and ionic strength dependent.
• Insights gained facilitate the regeneration of CNF filters.
• This work advances understanding of interactions with permanently charged surfaces.