Removal of cationic dye methylene blue (MB) from aqueous solution by Coffee and Peanut husk Modified with Magnetite Iron Oxide Nanoparticles


  • Naereh Besharati
  • Nina Alizadeh university of guilan
  • Shahab Shariati



Methylene blue, Coffee, Peanut husk, Magnetic nanoparticles


Abstract. This study was focused on the adsorption of methylene blue (MB) as a cationic dye on magnetite nanoparticles loaded with coffee (MNLC) and magnetite nanoparticles loaded with peanut husk (MNLPH) as naturally cheap sources of adsorbent. Coffee and Peanut husk were magnetically modified by contact with water-based magnetic fluid. These new type of magnetically natural materials can be easily separated by means of magnetic separators. They were characterized with Fourier transform infrared spectroscopy (FT-IR), powder X-ray diffraction (XRD) and scanning electron microscopy (SEM) instruments. Different parameters affecting MB removal efficiency such as contact time, pH of solution and amount of adsorbents were studied and optimized. Dye adsorption process was studied from both kinetic and equilibrium point. The studies of MB sorption kinetic showed rapid dynamic sorption with second-order kinetic model, suggesting chemisorption mechanism with R2 = 0.9988, qeq=10.28 mg g-1 and R2=0.9967, qeq=128.20 mg g-1, respectively. Equilibrium data were fitted well to the Langmuir isotherm more than Freundlich and Temkin isotherm. The modified adsorbents showed MB removal with 88.49 and 74.62 mg g-1 sorption capacity for MNLC and MNLPH, respectively. This study showed a simple, efficient and reliable method for removal of MB from aqueous solutions with MNLC and MNLPH as efficient adsorbents.


Resumen. Este estudio se centró en la adsorción de azul de metileno (MB) como un colorante catiónico en nanopartículas de magnetita cargadas con café (MNLC) y nanopartículas de magnetita cargadas con cáscara de cacahuete (MNLPH) como fuentes de adsorbente naturalmente económicas. El café y la cáscara de maní se modificaron magnéticamente por contacto con un fluido magnético a base de agua. Este nuevo tipo de materiales magnéticamente naturales se puede separar fácilmente mediante separadores magnéticos. Se caracterizaron con espectroscopia infrarroja de transformada de Fourier (FT-IR), difracción de rayos X en polvo (DRX) y microscopía electrónica de barrido (SEM). Se estudiaron y optimizaron diferentes parámetros que afectan la eficiencia de eliminación de MB, como el tiempo de contacto, el pH de la solución y la cantidad de adsorbentes. Se estudió el proceso de adsorción de tinte desde el punto de equilibrio y cinético. Los estudios de cinética de absorción de MB mostraron una absorción dinámica rápida con un modelo cinético de segundo orden, lo que sugiere un mecanismo de quimiosorción con R2= 0.9988, qeq= 10.28 mg g-1 y R2= 0.9967, qeq= 128.20 mg g-1, respectivamente. Los datos de equilibrio se ajustaron bien a la isoterma de Langmuir más que a la isoterma de Freundlich y Temkin. Los adsorbentes modificados mostraron eliminación de MB con 88.49 y 74.62 mg g-1 de capacidad de absorción para MNLC y MNLPH, respectivamente. Este estudio mostró un método simple, eficiente y confiable para la eliminación de MB de soluciones acuosas con MNLC y MNLPH como adsorbentes eficientes.


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