Cestari Antonio R, Vieira Eunice F S, Dos Santos Aline G P, Mota Jackeline A, de Almeida Vanessa P
Laboratory of Materials and Calorimetry, Departamento de Química/CCET, Universidade Federal de Sergipe, CEP 49000-000, São Cristovão, Sergipe, Brazil.
J Colloid Interface Sci. 2004 Dec 15;280(2):380-6. doi: 10.1016/j.jcis.2004.08.007.
In this work, chitosan beads were synthesized in acidic medium and cross-linked in 1% glutaraldehyde solution. The characterization of the materials using TG/DTG, XRD, and BET surface areas showed that the beads did not modify their characteristics after the cross-linking reaction. The cross-linked beads were utilized as adsorbents for the removal of the yellow-, blue-, and red-anionic reactive dyes from aqueous solutions at pH 2.0. Adsorption of the yellow-dye increased from 25 to 50 degrees C. However, adsorption of the blue-dye decreased from 25 to 50 degrees C. Interestingly, the adsorption of the red-dye decreased from 25 to 35 degrees C and increased from 45 to 50 degrees C. The kinetic data were evaluated using an Avrami kinetic model, where the parameter n was related to the determination of changes in the adsorption mechanisms. Adsorption data of the dyes in relation to the contact time, the chemical structures of the dyes, and temperature were presented and were discussed.
在本研究中，壳聚糖珠在酸性介质中合成，并在1%戊二醛溶液中交联。使用TG/DTG、XRD和BET表面积对材料进行表征，结果表明交联反应后珠子的特性未发生改变。交联后的珠子用作吸附剂，用于在pH 2.0条件下从水溶液中去除黄色、蓝色和红色阴离子活性染料。黄色染料的吸附量在25至50℃范围内增加。然而，蓝色染料的吸附量在25至50℃范围内减少。有趣的是，红色染料的吸附量在25至35℃范围内减少，在45至50℃范围内增加。使用Avrami动力学模型评估动力学数据，其中参数n与吸附机制变化的确定有关。给出并讨论了染料的吸附数据与接触时间、染料化学结构和温度的关系。
