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Polydopamine-Modified Cellulose Nanofibril Composite Aerogel: An Effective Dye Adsorbent
Ying Huo1, Yingying Liu1, Jian Yang1
1Tianjin Key Laboratory of Pulp and Paper, School of Light Industry Science and Engineering, Tianjin University of Science & Technology, Tianjin 300457, China.
Langmuir : the ACS Journal of Surfaces and Colloids
|March 28, 2022
Summary
A new polydopamine-coated cellulose nanofibril aerogel (PCNF) shows enhanced adsorption for methylene blue dye. This sustainable material offers potential for effective wastewater treatment with high reusability.
Area of Science:
- Materials Science
- Environmental Science
- Nanotechnology
Background:
- Cellulose nanofibrils (CNF) are promising biomaterials for various applications.
- Developing efficient and sustainable methods for modifying CNF is crucial.
- Mussel-inspired chemistry offers a green approach for material functionalization.
Purpose of the Study:
- To fabricate a novel cellulose nanofibril (CNF) composite aerogel using a mussel-inspired polydopamine (PDA) coating.
- To investigate the structural, mechanical, and adsorption properties of the resulting PDA@CNF (PCNF) composite aerogel.
- To evaluate the potential of PCNF composite aerogels for methylene blue (MB) removal in wastewater treatment.
Main Methods:
- Fabrication of CNF hydrogel crosslinked with calcium ions.
- Surface modification of CNF with dopamine to form polydopamine (PDA) coating, creating PCNF aerogels.
- Characterization of aerogel properties including surface area, density, mechanical strength, and wet resilience.
- Methylene blue (MB) adsorption experiments to determine capacity, kinetics, and isotherm behavior.
- Evaluation of adsorption performance across a range of pH values and assessment of reusability.
Main Results:
- PCNF composite aerogels exhibited high surface area (368.15 m²/g) and low density (27.2 mg/cm³).
- Mechanical properties were significantly improved (nearly threefold increase) compared to bare CNF aerogels, with good wet state resilience.
- Maximum MB adsorption capacity reached 208 mg/g, consistent with Langmuir and pseudo-second-order models.
- Effective MB removal was observed over a wide pH range, with >85% efficiency retained after five reuse cycles.
Conclusions:
- The mussel-inspired coating strategy successfully produced PCNF composite aerogels with enhanced properties.
- PCNF composite aerogels demonstrate excellent adsorption capacity and reusability for methylene blue.
- These findings highlight the potential of PCNF composite aerogels for sustainable and energy-efficient wastewater treatment applications.
