Deeper Insights into the Bohart-Adams Model in a Fixed-Bed Column

Area of Science:

• Environmental Chemistry
• Chemical Engineering
• Adsorption Science

Background:

• The Bohart-Adams model is a standard for column breakthrough curve analysis.
• It often fails to accurately model asymmetric breakthrough curves.
• Improved modeling is crucial for optimizing adsorption processes.

Purpose of the Study:

• To develop and validate novel Bohart-Adams models for asymmetric breakthrough curves.
• To introduce the n-order Bohart-Adams and fractal-like Bohart-Adams models.
• To compare their performance against the traditional Bohart-Adams model.

Main Methods:

• Mathematical formulation of the n-order and fractal-like Bohart-Adams models.
• Experimental validation using norfloxacin and Cu(II) adsorption in fixed-bed columns.
• Statistical analysis of model fitting using R² and χ² values.

Main Results:

• The n-order model captures nonlinear decay, while the fractal-like model addresses diffusion on heterogeneous surfaces.
• Both new models demonstrated superior fitting performance compared to the original Bohart-Adams model.
• The fractal-like Bohart-Adams and modified dose-response models achieved excellent fits for Cu(II) and norfloxacin, respectively.

Conclusions:

• The proposed n-order and fractal-like Bohart-Adams models provide enhanced accuracy for asymmetric breakthrough curve modeling.
• These models offer a more practical approach for predicting adsorption behavior in column systems.
• The findings contribute to better design and operation of adsorption-based separation and purification processes.