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Fast dye removal from water by starch-based nanocomposites
Raelle F Gomes1, Antonio C Neto de Azevedo1, Antonio G B Pereira2
1Coordenação de Química, Universidade Estadual Vale do Acaraú (UVA), Campus da Betânia, 62040-370 Sobral, CE, Brazil.
Journal of Colloid and Interface Science
|June 4, 2015
Summary
A novel starch/cellulose nanowhiskers hydrogel composite efficiently removes methylene blue (MB) dye from wastewater. This biodegradable adsorbent shows high capacity, fast kinetics, and reusability for effective water remediation.
Area of Science:
- Materials Science
- Environmental Science
- Polymer Chemistry
Background:
- Methylene blue (MB) is a common dye pollutant in industrial wastewater.
- Developing efficient and sustainable adsorbents for dye removal is crucial for environmental protection.
Purpose of the Study:
- To synthesize and characterize a starch/cellulose nanowhiskers hydrogel composite for MB adsorption.
- To evaluate the adsorption capacity, kinetics, and reusability of the composite for MB removal.
Main Methods:
- Preparation of a hydrogel composite from starch and cellulose nanowhiskers.
- MB adsorption experiments were conducted at various initial concentrations and pH levels.
- Adsorption kinetics and isotherms were analyzed using pseudo-second order and Langmuir models, respectively.
- Desorption and reusability tests were performed.
Main Results:
- The composite exhibited a maximum MB adsorption capacity of approximately 2050 mg/g.
- Optimal adsorption occurred at pH 5, with ca. 90% MB removal across tested concentrations.
- Adsorption followed pseudo-second order kinetics and Langmuir isotherm, indicating monolayer chemisorption.
- The adsorbent demonstrated good reusability with 60% MB desorption at pH 1.
Conclusions:
- The starch/cellulose nanowhiskers hydrogel composite is a highly efficient and biodegradable adsorbent for MB removal.
- Its fast adsorption kinetics and reusability make it a promising material for wastewater treatment.
- This adsorbent offers a sustainable solution for methylene blue contaminated water remediation.
