Characterization and Surface Study of Volcanic Ashes from Popocatépetl

Area of Science:

• Environmental Science
• Materials Science
• Chemistry

Background:

• Puebla City, Mexico, faces pollution from volcanic ash.
• Volcanic ash characterization is crucial for understanding its properties.

Purpose of the Study:

• To investigate the potential of Popocatépetl volcanic ash as an adsorbent for methylene blue removal.
• To characterize the volcanic ash and analyze its adsorption behavior.

Main Methods:

• Spectroscopic characterization (IR, ESR, SEM, X-ray diffraction).
• Batch adsorption experiments with varying dye concentrations and contact times.
• Adsorption isotherm modeling (Langmuir and Freundlich).
• Kinetic studies using pseudo-first-order model.

Main Results:

• Volcanic ash demonstrated effective adsorption of methylene blue.
• Langmuir model showed a maximum adsorption capacity (qmax) of 3.46 mg/g.
• Pseudo-first-order kinetics yielded a rate constant (k) of 8.02 × 10⁻³ min⁻¹.
• Specific surface area (SSA) was 0.7245 m²/g.

Conclusions:

• Popocatépetl volcanic ash is a viable, natural adsorbent for methylene blue.
• Adsorption capacity is comparable to some activated carbon products.
• Volcanic ash requires no pre-treatment, offering an advantage over current adsorbents.