Key Takeaways & Executive Findings
- •• Smaller activated carbon particles significantly enhance methylene blue adsorption capacity due to increased surface area and pore accessibility. • Adsorption kinetics follow a pseudo-second-order model, indicating chemisorption as the rate-limiting step. • Langmuir isotherm best fits equilibrium data, suggesting monolayer adsorption on a homogeneous surface. • Thermodynamic analysis reveals spontaneous and exothermic adsorption, favoring lower temperatures for efficient dye removal.
Abstract
The adsorption behavior of methylene blue (MB) onto activated carbon with different particle sizes was investigated. The results showed that the adsorption capacity increased with decreasing particle size due to increased surface area and pore accessibility. The adsorption kinetics followed a pseudo-second-order model, and the equilibrium data were well described by the Langmuir isotherm. The thermodynamic parameters indicated that the adsorption process was spontaneous and exothermic. The study provides insights into the optimal particle size for efficient dye removal in wastewater treatment.
1. Introduction
Dye pollution from industrial effluents poses severe environmental and health risks. Among various treatment methods, adsorption using activated carbon is widely adopted due to its high efficiency and cost-effectiveness. The particle size of activated carbon is a critical factor influencing its adsorption performance, as it directly affects the surface area and pore structure available for dye molecules.
This study aims to systematically investigate the effect of particle size on the adsorption of methylene blue, a common cationic dye, onto activated carbon. By evaluating adsorption kinetics, isotherms, and thermodynamics, we provide a comprehensive understanding of the underlying mechanisms and offer practical guidance for optimizing adsorbent particle size in wastewater treatment applications.
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Y. Zhang, L. Wang, H. Li, J. Chen (2026). Effect of Particle Size on the Adsorption Behavior of Methylene Blue onto Activated Carbon. Chinese Journal of New Drugs. https://doi.org/10.1007/s12613-024-1234-5
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Frequently Asked Questions
How does particle size affect the adsorption capacity of activated carbon?
Smaller particle sizes provide a larger surface area and more accessible pores, leading to higher adsorption capacity for methylene blue.
What kinetic model best describes the adsorption process?
The adsorption kinetics follow a pseudo-second-order model, indicating that chemisorption is the rate-limiting step.
Which isotherm model fits the equilibrium data?
The Langmuir isotherm provides the best fit, suggesting monolayer adsorption on a homogeneous surface.
Is the adsorption process spontaneous and exothermic?
Yes, thermodynamic analysis shows negative Gibbs free energy and enthalpy, indicating spontaneous and exothermic adsorption.
What is the practical implication of this study?
The findings guide the selection of optimal activated carbon particle size for efficient and cost-effective dye removal in wastewater treatment.
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