High Performance of Al-MCM-41 in Tetracycline Adsorption Using a Fixed-Bed Column

Area of Science:

• Environmental Chemistry
• Materials Science
• Water Treatment

Background:

• Emerging contaminants like tetracycline (TC) pose risks to aquatic ecosystems.
• Developing efficient adsorbents is crucial for sustainable water purification.
• Mesoporous silica materials offer tunable properties for contaminant removal.

Purpose of the Study:

• To evaluate aluminum-modified mesoporous silica (Al-MCM-41) for tetracycline removal.
• To investigate adsorption performance in batch and fixed-bed column systems.
• To assess the material's potential for sustainable water treatment.

Main Methods:

• Synthesis and characterization of Al-MCM-41 using XRD, N2 physisorption, FTIR, and TEM.
• Batch adsorption experiments to determine kinetics and isotherms.
• Fixed-bed column studies to evaluate performance under continuous flow.
• Thermodynamic analysis to understand adsorption mechanisms.

Main Results:

• Al-MCM-41 exhibited a high surface area (~850 m²/g) and ordered hexagonal structure.
• Maximum adsorption capacity in batch mode was 82.74 mg/g, fitting pseudo-second-order kinetics.
• Adsorption process was spontaneous and exothermic (ΔH° = -25.8 kJ/mol).
• Fixed-bed columns achieved 19.1 mg/g capacity, with the Yan model fitting breakthrough curves.

Conclusions:

• Al-MCM-41 demonstrates high efficiency for tetracycline removal from aqueous solutions.
• The material is suitable for continuous-flow water treatment systems.
• Results support the use of Al-MCM-41 in sustainable technologies for emerging contaminant removal.