Universidad de Santiago de Chile (USACH), Facultad de Química y Biología, Santiago, Chile.
Universidad Católica de la Santísima Concepción/Facultad de Ciencias, Departamento de Química Ambiental, Chile.
Int J Biol Macromol. 2024 Oct;278(Pt 2):134697. doi: 10.1016/j.ijbiomac.2024.134697. Epub 2024 Aug 13.
In this study, lignin derived from corncobs was chemically modified by substituting the hydroxyl groups present in its structure with methacrylate groups through a catalytic reaction using methacrylic anhydride, resulting in methacrylated lignin (ML). These MLs were incorporated in polymerization reaction of the monomer 2-[(acryloyloxy)ethyl trimethylammonium] chloride (Cl-AETA) and Cl-AETA, Cl-AETA/ML polymers were obtained, characterized (spectroscopic, thermal and microscopic analysis), and evaluated for removing Cr (VI) and As (V) from aqueous media in function of pH, contact time, initial metal concentrations and adsorbent amount. The Cl-AETA/ML polymers followed the Langmuir adsorption model for the evaluated metal anions and were able to remove up to 91 % of Cr (VI) with a q (maximum adsorption capacity) of 201 mg/g, while for As (V), up to 60 % could be removed with a q of 58 mg/g. The results demonstrate that simple modifications in lignin enhance its functionalization and properties, making it suitable for removing contaminants from aqueous media, showing promising results for potential future applications.
在这项研究中，通过使用甲基丙烯酰酐在催化反应中将存在于玉米芯衍生的木质素结构中的羟基用甲基丙烯酰基取代，从而对木质素进行化学修饰，得到甲基丙烯酰化木质素（ML）。将这些 ML 掺入单体 2-[(丙烯酰氧基)乙基三甲基氯化铵]（Cl-AETA）的聚合反应中，得到 Cl-AETA/ML 聚合物，对其进行了（光谱、热和微观分析）表征，并评估了它们在不同 pH 值、接触时间、初始金属浓度和吸附剂用量条件下从水溶液中去除 Cr(VI)和 As(V)的性能。Cl-AETA/ML 聚合物对评估的金属阴离子遵循 Langmuir 吸附模型，对 Cr(VI)的最大吸附容量 q 可达 201mg/g，去除率高达 91%；而对 As(V)的最大吸附容量 q 可达 58mg/g，去除率高达 60%。结果表明，对木质素进行简单的修饰可以增强其功能化和性能，使其适用于从水溶液中去除污染物，为未来的潜在应用展示了有希望的结果。
