Arsenate Adsorption from Aqueous Solutions Using Chitosan/Fe-Nanoparticles Composite Microspheres

Sandra Manzo Valencia, Dr. Ruth Alfaro Cuevas Villanueva, Dr. Juan Zárate Medina, Dr. María Karina Manzo Valencia, Dr. Rafael Huirache Acuña, Dr. Raúl Cortés Martínez

Te invitamos a leer el artículo "Arsenate Adsorption from Aqueous Solutions Using Chitosan/Fe-Nanoparticles Composite Microspheres"  publicado en ChemistrySelect, en el que colaboró María Karina Manzo Valencia de la Unidad Irapuato.

Autores:

Sandra Manzo Valencia, Dr. Ruth Alfaro Cuevas Villanueva, Dr. Juan Zárate Medina, Dr. María Karina Manzo Valencia, Dr. Rafael Huirache Acuña, Dr. Raúl Cortés Martínez

Resumen:

The adsorption behavior and synthesis of a chitosan microsphere composite with iron nanoparticles (Ch-Fe) for the removal of arsenates [As(V)] from aqueous solutions were investigated. First, the chitosan microspheres (Ch-SD) were obtained using the Spray Dryer volatilization technique (SD), optimizing their particle size. Then, the iron nanoparticles (Fe-NPs) were prepared using the microwave precipitation technique. The composite was characterized, and the arsenate adsorption parameters were determined through batch-type experiments. Significantly fast adsorption rates were observed for both adsorbents. Besides, Ch-Fe and Ch-SD effectively removed arsenates over a wide pH range. The hydroxyl and amino functional groups are involved in removing arsenates. The Pseudo-second order and the Elovich models described arsenate kinetic sorption data for Ch-Fe and Ch-SD, respectively. The As(V) maximum adsorption capacities were 27.46 mg/g and 29.94 mg/g for Ch-SD and Ch-Fe, respectively, increasing significantly at elevated temperatures. The Langmuir-Freundlich model adequately described the isothermal data for both materials, suggesting adsorption heterogeneity. The composite's surface impregnation with Fe-NPs enhanced the Ch-SD adsorption properties. The SD method was suitable for obtaining the chitosan/Fe-NPs microspheres and effectively removed As(V) from aqueous solutions.