Chemistry Department, College of Science, Taibah University, Yanbu Branch, Yanbu El-Bahr, Saudi Arabia; Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt.
Department of Chemistry, Faculty of Science, University of Tabuk, Tabuk 71421, Saudi Arabia.
Int J Biol Macromol. 2020 Jul 15;155:795-804. doi: 10.1016/j.ijbiomac.2020.03.215. Epub 2020 Mar 27.
An isatin functionalized chitosan derived ion-imprinted adsorbent (Cu-CIS) was designed by tailoring Cu(II) ions imprinted cavities within the modified polysaccharide network matrix that are able to capture Cu(II) ions selectively in aqueous solution. The chelating power of chitosan toward the Cu(II) ions was first enhanced via isatin functionalization, which was cross-linked using epichlorohydrin (ECH) after loading the Cu(II) ions. The selective metal ions binding sites are then formed by eluting the coordinated Cu(II) ions using EDTA to finally produce the Cu-CIS selective sorbent. The equilibrium isotherms have been utilized to anticipate the maximum capacity of the Cu-CIS sorbent and compare it with that of the blank non-imprinted sorbent NI-CIS. In addition, the significance of inserting the Cu(II) ions recognition cavities within the adsorbent matrix was pointed out by performing the adsorption in a multi-ionic solution mixture containing Co(II), Ni(II), Pb(II), Cd(II) and Cu(II) ions and the obtained selectivity coefficients in case of Cu-CIS revealed remarkable selectivity potentials toward the Cu(II) ions compared to NI-CIS. Moreover, at the consecutive performance of a Cu-CIS absorbent for five cycles, it was found that it still held 97% of its initial capacity enabling promising applications in both water treatment and Cu (II) ions recycling.
通过在修饰后的多糖网络基质内设计 Cu(II) 离子印迹空穴，制备了一种基于色氨酸功能化壳聚糖的离子印迹吸附剂（Cu-CIS），该空穴能够在水溶液中选择性地捕获 Cu(II) 离子。壳聚糖对 Cu(II) 离子的螯合能力首先通过色氨酸功能化得到增强，然后在负载 Cu(II) 离子后使用表氯醇（ECH）进行交联。然后通过使用 EDTA 洗脱配位的 Cu(II) 离子来形成选择性金属离子结合位点，最终生成 Cu-CIS 选择性吸附剂。利用平衡等温线预测了 Cu-CIS 吸附剂的最大容量，并将其与空白非印迹吸附剂 NI-CIS 的容量进行了比较。此外，通过在含有 Co(II)、Ni(II)、Pb(II)、Cd(II)和 Cu(II) 离子的多离子溶液混合物中进行吸附，指出了在吸附剂基质内插入 Cu(II) 离子识别空穴的重要性，并且在 Cu-CIS 的情况下获得的选择性系数表明，与 NI-CIS 相比，Cu-CIS 对 Cu(II) 离子具有显著的选择性潜力。此外，在 Cu-CIS 吸附剂连续进行五轮吸附实验中，发现其仍保持 97%的初始容量，这使其有望在水处理和 Cu(II) 离子回收方面得到应用。
