用提取的壳聚糖与新醛基形成席夫碱，快速吸附一些重金属。

Rapid adsorption of some heavy metals using extracted chitosan anchored with new aldehyde to form a schiff base.

机构信息

Department of Chemistry, College of Education, Salahuddin University-Erbil, Erbil, Iraq.

出版信息

PLoS One. 2022 Sep 9;17(9):e0274123. doi: 10.1371/journal.pone.0274123. eCollection 2022.

A new aldehyde 2,2'-[propane-1,3-diylbis(oxy)] dibenzaldehyde was synthesized from refluxing 2-hydroxy acetophenone and 2-hydroxy 1,3-dichloropropanean in an alcoholic medium. The compositions and properties of the new aldehyde compound were characterized by elemental analysis, FTIR, and nuclear magnetic resonance spectroscopy studies. The extracted chitosan was made to react with a new aldehyde to form a Schiff base by a suitable method. The effects of initial concentration of metal ions, exposure time, imine weight, and pH on the adsorption of Cu(II), Cr(III), and Zn(II) metal ions were examined. An adsorption batch experiment was conducted. The adsorption process followed a second-order reaction and Langmuir model with qe 25 mg/g, 121 mg/g, and 26.31 mg/g for Cu(II), Zn(II), and Cr(III) respectively. The Gibbs free energy showed a negative value and the adsorption/desorption tests provided a high value 5 times.

一种新型醛 2,2'-[丙烷-1,3-二基双(氧基)]二苯甲醛，是通过回流 2-羟基苯乙酮和 2-羟基-1,3-二氯丙烷在醇介质中合成的。新醛化合物的组成和性质通过元素分析、FTIR 和核磁共振波谱研究进行了表征。通过适当的方法，使提取的壳聚糖与新型醛反应形成席夫碱。考察了初始金属离子浓度、暴露时间、亚胺重量和 pH 值对 Cu(II)、Cr(III)和 Zn(II)金属离子吸附的影响。进行了吸附批量实验。吸附过程遵循二级反应和 Langmuir 模型，对于 Cu(II)、Zn(II)和 Cr(III)，qe 分别为 25 mg/g、121 mg/g 和 26.31 mg/g。吉布斯自由能呈负值，吸附/解吸测试提供了 5 倍的高值。