Reyes I, Villarroel M, Diez M C, Navia R
Magister en Ciencias de la Ingeniería mención Biotecnología, Universidad de La Frontera, Casilla 54-D, Temuco, Chile.
Bioresour Technol. 2009 Oct;100(20):4676-82. doi: 10.1016/j.biortech.2009.03.080. Epub 2009 May 30.
Adsorption of copper and zinc in lignimerin (an organic material mainly composed by lignin, carbohydrate fragments and some extractives) and its acid derivative (H-lignimerin), recovered from Kraft cellulose mill wastewater was examined. A Box-Behnken experiment design, used to optimize lignimerin recovery process, revealed that the type of solvent used for precipitation is a determining factor in the amount of substance obtained. Conversely, batch adsorption studies at pH 4.0 revealed that the maximum adsorption capacities, modeled by the Langmuir equation, were 666.7 and 370.4 mmol kg(-1) for Cu(II) and Zn(II), respectively in lignimerin and 232.6 and 312.5 mmol kg(-1) for Cu(II) and Zn(II), respectively in H-lignimerin. The adsorption of Cu(II) and Zn(II) through deprotonated hydroxyl and carboxylic groups was the dominant mechanism that may explain the adsorption in both materials. The adsorption capacities indicated that lignimerin, with a molecular mass between 50 and 70 kDa, has a potential use as an organic sorbent for removing copper and zinc from liquid resources.
对从硫酸盐制浆厂废水中回收的木质素（一种主要由木质素、碳水化合物片段和一些提取物组成的有机物质）及其酸衍生物（H-木质素）中铜和锌的吸附进行了研究。用于优化木质素回收工艺的Box-Behnken实验设计表明，用于沉淀的溶剂类型是获得物质数量的决定性因素。相反，在pH 4.0下的批量吸附研究表明，用Langmuir方程建模的最大吸附容量，在木质素中，Cu(II)和Zn(II)分别为666.7和370.4 mmol kg(-1)，在H-木质素中，Cu(II)和Zn(II)分别为232.6和312.5 mmol kg(-1)。通过去质子化的羟基和羧基对Cu(II)和Zn(II)的吸附是可能解释两种材料吸附的主要机制。吸附容量表明，分子量在50至70 kDa之间的木质素具有作为从液体资源中去除铜和锌的有机吸附剂的潜在用途。
