Anionic dye uptake via composite using chitosan-polyacrylamide hydrogel as matrix containing TiO₂ nanoparticles;...

Area of Science:

• Materials Science
• Environmental Chemistry
• Nanotechnology

Background:

• Wastewater contamination by synthetic dyes poses significant environmental challenges.
• Developing efficient and reusable adsorbents is crucial for effective dye removal.

Purpose of the Study:

• To synthesize and characterize a novel TiO2-PAM-CS nanocomposite for Sirius Yellow K-CF dye uptake.
• To investigate the adsorption mechanism and optimize removal conditions.

Main Methods:

• In situ synthesis of TiO2 nanoparticles within a chitosan-grafted polyacrylamide matrix.
• Characterization using FE-SEM, TEM, XRD, and FT-IR.
• Batch adsorption experiments to evaluate pH, dose, time, and temperature effects.

Main Results:

• The TiO2-PAM-CS nanocomposite achieved 96.81% dye removal at pH 2 and 40°C.
• Adsorption data fitted well with the Langmuir isotherm (q_m = 1000 mg/g).
• Adsorption was found to be physical, endothermic, spontaneous, and followed pseudo-second-order kinetics.

Conclusions:

• The TiO2-PAM-CS nanocomposite is an effective adsorbent for Sirius Yellow K-CF dye removal.
• Adsorption mechanism involves hydrogen bonding and electrostatic interactions.
• The adsorbent is reusable, indicating potential for practical wastewater treatment applications.