Nanocellulose-based polyurethane foam adsorbent for pressure-driven dye-contaminated water purification

Area of Science:

• Materials Science
• Environmental Science
• Chemical Engineering

Background:

• Dye contamination poses a significant global threat to aquatic ecosystems and human health.
• Effective and sustainable methods for dye removal from wastewater are urgently needed.

Purpose of the Study:

• To develop a bioinspired pressure-driven foam adsorbent (PFA) for efficient dye removal.
• To investigate the adsorption capacity and performance of PFA for methyl orange (MO) and crystal violet (CV) dyes.

Main Methods:

• A one-step synthesis method was employed to prepare PFA using nanocellulose (NC), amino-functionalized ZIF-8 (ZIF-8-NH2), and polyurethane foam (PUF).
• The PFA's performance was evaluated for removing MO and CV dyes from contaminated water solutions under varying pH conditions.
• Adsorption capacities and removal efficiencies were determined, and the material's reusability was assessed over multiple cycles.

Main Results:

• The PFA exhibited maximum adsorption capacities of 225.9 mg/g for MO (at pH 2) and 41.6 mg/g for CV (at pH 10).
• High removal efficiencies for both dyes were achieved in various river water samples.
• The PFA demonstrated good reusability, with removal efficiencies decreasing only slightly after five cycles.

Conclusions:

• The developed PFA is a highly effective adsorbent for removing common dyes from contaminated water.
• The pressure-driven mechanism allows for efficient water purification under low pressure.
• This bioinspired material presents a viable and sustainable approach to wastewater treatment.