Kinetic studies on sorption of basic dye using Eichhornia crassipes

Area of Science:

• Environmental Science
• Water Treatment Technologies
• Bioremediation

Background:

• Wastewater contamination by synthetic dyes poses significant environmental challenges.
• Eichhornia crassipes (water hyacinth) is an abundant aquatic plant with potential biosorbent properties.
• Basic aurophine-o is a common dye requiring efficient removal methods.

Purpose of the Study:

• To evaluate the sorption capacity of different Eichhornia crassipes parts for basic aurophine-o dye.
• To compare the effectiveness of root, rhizome, lamina, and petiole as biosorbents.
• To develop and validate shortcut equations for predicting dye uptake.

Main Methods:

• Batch sorption experiments were conducted using various parts of Eichhornia crassipes.
• Equilibrium uptake capacity was determined for each plant part.
• Intra-particle diffusion coefficient (K(i)) and effective diffusion coefficient (D(i)) were calculated.
• Shortcut equations were developed to model the sorption process.

Main Results:

• The root part of Eichhornia crassipes exhibited the highest equilibrium dye uptake capacity (13.65 mg/g).
• Roots showed greater sorption capacity than lamina (13.5 mg/g), rhizome (12.9 mg/g), and petiole (12.75 mg/g).
• Higher intra-particle diffusion and effective diffusion coefficients were observed for the root compared to other parts.

Conclusions:

• Eichhornia crassipes roots are an effective biosorbent for basic aurophine-o dye removal.
• The developed shortcut equations accurately predict dye uptake and can guide future research.
• This study highlights the potential of water hyacinth for sustainable wastewater treatment.