Use of a floating adsorbent to remove dyes from water: A novel efficient surface separation method

Area of Science:

• Materials Science
• Environmental Chemistry
• Nanotechnology

Background:

• Wastewater contamination by cationic dyes poses environmental and health risks.
• Conventional dye removal methods often involve complex separation processes and adsorbent recovery challenges.
• Development of efficient, easily separable adsorbents is crucial for sustainable water treatment.

Purpose of the Study:

• To synthesize and characterize a novel floating adsorbent material for cationic dye removal.
• To investigate the adsorption mechanism and capacity of the developed adsorbent for various cationic dyes.
• To evaluate the recyclability and practical applicability of the adsorbent in water purification.

Main Methods:

• Grafting of 2-acrylamido-2-methylpropane sulfonic acid (AMPS) onto hollow glass microspheres (HGM).
• Characterization of the AMPS-grafted floating adsorbent (AFA) using techniques like SEM, EDX, XPS, FTIR, BET, TGA, and XRD.
• Adsorption experiments to determine the capacity for methylene blue, malachite green, basic fuchsin, and crystal violet.
• Evaluation of adsorbent recyclability over multiple adsorption-desorption cycles.

Main Results:

• Successful synthesis of AMPS-grafted floating adsorbent (AFA) with stable self-floating ability.
• AFA exhibits strong electrostatic interaction for efficient adsorption of cationic dyes.
• High adsorption capacities were achieved: 436.8 mg/g for methylene blue, 637.6 mg/g for malachite green, 457.8 mg/g for basic fuchsin, and 399.4 mg/g for crystal violet.
• The adsorbent demonstrated excellent recyclability, maintaining its capacity after 6 cycles.

Conclusions:

• The developed AFA is a highly efficient and easily separable adsorbent for cationic dyes.
• The electrostatic interaction and unique shell structure contribute to its superior performance.
• AFA offers a promising solution for sustainable and cost-effective wastewater treatment.