Highly Efficient Methylene Blue Dye Removal by Nickel Molybdate Nanosorbent

Area of Science:

• Materials Science
• Environmental Chemistry
• Nanotechnology

Background:

• Methylene blue (MB) is a common pollutant in industrial wastewater.
• Effective and economical methods for MB removal are crucial for environmental protection.

Purpose of the Study:

• To synthesize and evaluate nickel molybdate (α-NiMoO₄) as a novel adsorbent for MB removal.
• To investigate the adsorption mechanism and performance of α-NiMoO₄ under various conditions.

Main Methods:

• α-NiMoO₄ nanoparticles were synthesized using a simple, rapid, and cost-effective method.
• Adsorption experiments were conducted by varying pH, adsorbent dose, temperature, contact time, and initial MB concentration.
• Adsorption kinetics, thermodynamics, and regeneration efficiency were studied. Material characterization was performed using FTIR and SEM.

Main Results:

• α-NiMoO₄ demonstrated high efficiency in removing MB, achieving 99% removal at pH 11 for concentrations up to 160 ppm.
• Adsorption followed pseudo-second-order kinetics and was favorable, spontaneous, and endothermic.
• The maximum adsorption capacity reached 16,863 mg/g (Langmuir model), and the adsorbent retained high efficiency after three regeneration cycles (11,608 mg/g).

Conclusions:

• α-NiMoO₄ is a highly effective, reusable, and cost-efficient adsorbent for methylene blue removal from aqueous solutions.
• The material shows excellent potential for industrial wastewater treatment applications.
• FTIR and SEM analyses confirmed the adsorption and regeneration processes.