Robledo-Peralta Adriana, García-Quiñonez Linda Viviana, Rodríguez-Beltrán René I, Reynoso-Cuevas Liliana
Department of Sustainable Engineering, Advanced Materials Research Center (CIMAV-Durango), CIMAV 110 Street, Ejido Arroyo Seco, Durango C.P. 34147, Durango, Mexico.
CONACYT-Centro de Investigación Científica y de Educación Superior de Ensenada, Unidad Foránea Monterrey, Alianza Centro 504, PIIT, Apodaca C.P. 66629, Nuevo León, Mexico.
Polymers (Basel). 2022 Apr 12;14(8):1575. doi: 10.3390/polym14081575.
The development of biocomposite materials used as adsorbents to remove ions in aqueous media has become an attractive option. The biomasses (base materials) are chemically treated and impregnated with metal cations, becoming competitive for fluoride-capture capacity. In this research, Valence orange () and Red Delicious apple () peels were modified by alkaline treatment, carboxylation, and impregnation with zirconium (Zr). These materials were characterized morphologically and structurally to understand the modifications in the treated biomasses and the mechanism of fluoride adsorption. The results show changes in surface area and composition, most notably, an increment in roughness and Zr impregnation of the bioadsorbents. After batch experimentation, the maximum capacity of the materials was determined to be 4.854 and 5.627 mg/g for the orange and apple peel bioadsorbent, respectively, at pH 3.5. The experimental data fitted the Langmuir model, suggesting that chemisorption occurs in monolayers. Finally, the characterization of the bioadsorbents in contact with fluoride allowed the replacement of OH species by fluoride or the formation of hydrogen bonds between them as an adsorption mechanism. Therefore, these bioadsorbents are considered viable and can be studied in a continuous system.
用作吸附剂以去除水介质中离子的生物复合材料的开发已成为一个有吸引力的选择。生物质（基础材料）经过化学处理并用金属阳离子浸渍，在氟捕获能力方面具有竞争力。在本研究中，通过碱处理、羧基化和用锆（Zr）浸渍对脐橙（Valencia orange）和红元帅苹果（Red Delicious apple）果皮进行了改性。对这些材料进行了形态和结构表征，以了解处理后生物质的改性情况以及氟吸附机制。结果显示了表面积和组成的变化，最显著的是生物吸附剂的粗糙度增加和Zr浸渍。经过批量实验，在pH 3.5时，橙子皮和苹果皮生物吸附剂的材料最大容量分别确定为4.854和5.627 mg/g。实验数据符合朗缪尔模型，表明化学吸附以单层形式发生。最后，对与氟接触的生物吸附剂的表征表明，氟可取代OH物种或在它们之间形成氢键作为吸附机制。因此，这些生物吸附剂被认为是可行的，并且可以在连续系统中进行研究。
