García-Vargas Miriam, Munguía-Quintero María Fernanda, Alcaraz-Cienfuegos Jorge, Rosas-Aburto Alberto, Valdivia-López María de Los Ángeles, Hernández-Luna Martin Guillermo, Vivaldo-Lima Eduardo
Facultad de Química, Departamento de Ingeniería Química, Universidad Nacional Autónoma de México, 04510 Ciudad de México, Mexico.
Facultad de Química, Departamento de Alimentos y Biotecnología, Universidad Nacional Autónoma de México, 04510 Ciudad de México, México.
Int J Biol Macromol. 2025 Jan;284(Pt 1):137986. doi: 10.1016/j.ijbiomac.2024.137986. Epub 2024 Nov 26.
The synthesis, characterization and evaluation of cellulose-graft-poly(4-vinylpirydine) for heavy metal removal from wastewater, is reported. Cellulose was obtained from a corn cob biomass using a recently developed gas-phase acid pretreatment process (GPAPP). The obtained corn cob cellulose (CCC) was functionalized by partial esterification of the superficial -OH groups with α-bromoisobutyryl bromide (BIBB) under mild conditions (room temperature and dimethyl formamide, DMF as solvent). The functionalized cellulose was characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM)/energy dispersive spectroscopy (EDS), thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS). The BIBB-functionalized CCC was used as initiator for surface-initiated (SI) atom transfer radical polymerization (ATRP) of 4-vinylpyridine (4VP). Grafting of the polymer (p4VP) onto cellulose was confirmed by FTIR, TGA and XPS. The same procedure was carried out with microcrystalline cellulose (MCC) as a reference. The performance of the cellulose copolymers for the removal of lead and iron from water was evaluated. Removal percentages of 83 % in 30 min for lead and 79 % in 180 min for iron were obtained with MCC-g-p4VP. In contrast, removal percentages of 50 % were obtained in 30 min for lead and 30 % for iron in 180 min, respectively, when CCC-g-p4VP was used.
报道了用于从废水中去除重金属的纤维素接枝聚（4-乙烯基吡啶）的合成、表征及评价。纤维素是通过最近开发的气相酸预处理工艺（GPAPP）从玉米芯生物质中获得的。在温和条件下（室温，以二甲基甲酰胺（DMF）为溶剂），用α-溴异丁酰溴（BIBB）对所得玉米芯纤维素（CCC）表面的-OH基团进行部分酯化，从而实现功能化。通过傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）/能谱分析（EDS）、热重分析（TGA）和X射线光电子能谱（XPS）对功能化纤维素进行了表征。将BIBB功能化的CCC用作4-乙烯基吡啶（4VP）表面引发（SI）原子转移自由基聚合（ATRP）的引发剂。通过FTIR、TGA和XPS证实了聚合物（p4VP）接枝到纤维素上。以微晶纤维素（MCC）为参比进行了相同的操作。评价了纤维素共聚物从水中去除铅和铁的性能。MCC-g-p4VP对铅的去除率在30分钟内达到83%，对铁的去除率在180分钟内达到79%。相比之下，使用CCC-g-p4VP时，铅在30分钟内的去除率为50%，铁在180分钟内的去除率为30%。
