Fast and highly efficient adsorption of cationic dyes by phytic acid crosslinked β-cyclodextrin

Area of Science:

• Materials Science
• Environmental Chemistry
• Water Treatment

Background:

• Industrial wastewater often contains cationic dyes, posing environmental risks.
• Effective removal of these dyes requires efficient and selective adsorbents.

Purpose of the Study:

• To synthesize and characterize a novel adsorbent material for cationic dye removal.
• To evaluate the adsorption capacity, kinetics, and selectivity of the new adsorbent.
• To assess the adsorbent's reusability for sustainable wastewater treatment.

Main Methods:

• Poly-condensation reaction of phytic acid (PA) and β-cyclodextrin (β-CD) to create PA-β-CD.
• Adsorption experiments using methylene blue, basic green 4, astrazon pink FG, and crystal violet.
• Analysis of adsorption kinetics using pseudo-second-order model and isotherms using Langmuir model.
• Testing adsorbent selectivity in a cationic/anionic dye mixture and evaluating regeneration efficiency.

Main Results:

• PA-β-CD exhibited high adsorption capacities for cationic dyes, reaching up to 2005.58 mg/g.
• Adsorption was rapid, with most dye removal occurring within the first 2 minutes.
• The adsorbent demonstrated selective removal of cationic dyes from mixed dye solutions.
• Adsorption followed pseudo-second-order kinetics and Langmuir isotherm models.
• Regeneration efficiency remained above 90% after five cycles.

Conclusions:

• PA-β-CD is a highly efficient and fast adsorbent for cationic dyes.
• The material shows excellent selectivity and reusability, making it suitable for dye wastewater treatment.
• PA-β-CD holds significant potential for practical applications in environmental remediation.