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:: Volume 16, Issue 2 (summer 2025) ::
j.health 2025, 16(2): 124-137 Back to browse issues page
Efficient Removal of Cationic Dye Methylene Blue from Aqueous Solutions Using Rice Husk: Process Optimization via Box-Behnken Design and Evaluation of Adsorption Isotherms and Kinetics
Asghar Asghari , Mehdi Vosoughi* * , Abdollah Dargahi , Reza Rezapour , Morteza Eyni
Ardabil University of Medical Sciences, Ardabil, Iran
Abstract:   (25 Views)
Background & objectives: Synthetic dyes are among the most persistent and hazardous pollutants in industrial wastewater. Methylene blue (MB), a cationic dye with a complex aromatic structure, is extensively used in the textile industry for dyeing silk, cotton, and wool. Its release into aquatic environments poses significant ecological risks. This study investigates the potential of rice husk—a low-cost, abundant agricultural byproduct—as an effective biosorbent for MB removal. Characterization of rice husk was performed using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and Fourier-transform infrared spectroscopy (FTIR) to elucidate its structural and functional properties.
Methods: The adsorption process was systematically optimized using response surface methodology (RSM) based on the Box-Behnken design. Key operational parameters—solution pH, initial dye concentration, adsorbent dosage, and contact time—were varied to evaluate their influence on MB removal efficiency.
Results: Equilibrium data conformed well to the Langmuir isotherm model, indicating monolayer adsorption with a maximum adsorption capacity (qₘ) of 40.58 mg/g at room temperature. Kinetic analysis revealed that the pseudo-second-order model best described the adsorption behavior, suggesting chemisorption involving surface functional groups. Analysis of variance (ANOVA) identified optimal conditions for maximum dye removal: pH 7, dye concentration 50 mg/L, adsorbent dosage 2 g/L, and contact time 62.5 minutes. Under these conditions, the adsorption efficiency exceeded 89.09%.
Conclusion: Rice husk demonstrates strong potential as a sustainable and eco-friendly adsorbent for the removal of cationic dyes from wastewater. Its high efficiency, low cost, and environmental compatibility make it a promising candidate for large-scale industrial applications.
 
Keywords: Adsorption, Rice Husk, Methylene Blue, Kinetics, Isotherm, Box-Behnken Design
Full-Text [PDF 623 kb]   (11 Downloads)    
Type of Study: Research | Subject: General
Received: 2025/09/16 | Accepted: 2025/09/1 | Published: 2025/09/1
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Asghari A, Vosoughi* M, Dargahi A, Rezapour R, Eyni M. Efficient Removal of Cationic Dye Methylene Blue from Aqueous Solutions Using Rice Husk: Process Optimization via Box-Behnken Design and Evaluation of Adsorption Isotherms and Kinetics. j.health 2025; 16 (2) :124-137
URL: http://healthjournal.arums.ac.ir/article-1-3023-en.html


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Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Volume 16, Issue 2 (summer 2025) Back to browse issues page
مجله سلامت و بهداشت Journal of Health
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