Optimization of methylene blue using Ca(2+) and Zn(2+) bio-polymer hydrogel beads: A comparative study

Area of Science:

• Environmental Chemistry
• Materials Science

Background:

• Methylene blue poses severe central nervous system toxicity.
• Effective removal of methylene blue from aqueous environments is crucial for environmental safety.

Purpose of the Study:

• To investigate the optimization of methylene blue using modified calcium (Ca2+) and zinc (Zn2+) bio-polymer hydrogel beads.
• To compare the efficiency of these modified hydrogel beads for methylene blue removal.

Main Methods:

• Batch mode studies were conducted varying parameters like time, dye concentration, bio-polymer dose, pH, and temperature.
• Isotherm, kinetic, diffusion, and thermodynamic studies were performed.
• Material characterization using Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscope (SEM), along with Thermogravimetric (TG) and Differential Thermal Analysis (DTA).

Main Results:

• Both Ca2+ and Zn2+ modified hydrogel beads demonstrated effective methylene blue optimization.
• Freundlich and Langmuir isotherms, along with pseudo-first and pseudo-second order kinetics, were used to model the process.
• FTIR and SEM confirmed the presence of Ca2+ and Zn2+ in the beads, and TG/DTA indicated good thermal stability.

Conclusions:

• Modified Ca2+ and Zn2+ bio-polymer hydrogel beads are efficient for methylene blue removal from aqueous solutions.
• The study provides insights into the optimization mechanism and material properties for environmental remediation.
• These hydrogel beads offer a stable and effective solution for dye pollutant removal.