Department of Chemistry, College of Education, Salahaddin University-Erbil, Erbil, Iraq.
Department of Chemistry, College of Science, University of Raparin, Sulaymaneyah, Iraq.
Int J Biol Macromol. 2023 Jun 1;239:124318. doi: 10.1016/j.ijbiomac.2023.124318. Epub 2023 Apr 2.
The objective of this project is to create a unique type of polymer known as an ion imprinted polymer (IIP) and a non-imprinted polymer (NIP) utilizing natural waste biosorbent materials. One example of this type of waste is Aloe vera, a plant with many medicinal uses that is grown globally. Aloe vera is considered one of the most valuable medicinal plants with a wide range of applications. Extracted Aloe vera was used as functional monomers for the first time to prepare new IIPs, epichlorohydrin, and Cu ion as the cross-linking agent and template, respectively. The NIP was also synthesized for comparison, without the use of the Cu salt. Following polymerization, the IIP particles were cleansed of template ions through a 0.1 M EDTA leaching process, resulting in the formation of cavities within the particles, these cavities in the polymer provide selective linking zones for these specific template ions. The synthesized IIPs were characterized using the most recent identification instruments. The experimental parameters for adsorption, such as pH of a solution, contact time, initial copper concentration, adsorbent dosage, and temperature have been optimized. The most effective conditions for metal adsorption onto the ionic imprinted polymer were found to be a pH of 8.0, a temperature of 30 °C, a concentration of 0.03 g/100 mL, and a contact time of 50 min. Based on the ANOVA statistical value, the adsorption of Cu ion on IIP is significant with very low probability (p) values (<0.001). The Langmuir isotherm model and a second-order reaction were both used in the adsorption process. According to thermodynamic characteristics, Cu adsorption over IIPs and NIP was an endothermic, spontaneous process. Compared to NIP, the imprinted polymer exhibits a significantly better capacity and selectivity for Cu adsorption, the maximum removal percentage of IIPs and NIP was 96.02 % and 74.3 % respectively. Moreover, the research showed that ion imprinting can be a promising technique for preparing selective adsorbents to separate and preconcentrate metal in a medium of multiple competitive metals (Co, Cd, Ni, Zn, Fe, and Pb) The most important point for this new Cu-IIPs was shown superior reusability up to 8 cycles with small decrees in uptake capability.
本项目的目标是利用天然废弃生物吸附材料创建一种独特的聚合物，即离子印迹聚合物 (IIP) 和非印迹聚合物 (NIP)。这种废物的一个例子是芦荟，一种具有多种药用价值且在全球范围内种植的植物。芦荟被认为是最有价值的药用植物之一，具有广泛的应用。首次使用提取的芦荟作为功能单体来制备新型 IIP，分别使用表氯醇和 Cu 离子作为交联剂和模板。还合成了 NIP 进行比较，没有使用 Cu 盐。聚合后，通过 0.1 M EDTA 浸出过程将 IIP 颗粒中的模板离子洗净，导致颗粒内形成空腔，聚合物中的这些空腔为这些特定模板离子提供了选择性连接区域。使用最新的鉴定仪器对合成的 IIP 进行了表征。优化了吸附的实验参数，例如溶液的 pH、接触时间、初始铜浓度、吸附剂用量和温度。发现金属吸附到离子印迹聚合物上的最有效条件是 pH 为 8.0、温度为 30°C、浓度为 0.03 g/100 mL 和接触时间为 50 min。根据方差分析统计值，Cu 离子在 IIP 上的吸附具有显著意义，概率（p）值非常低（<0.001）。吸附过程中使用了 Langmuir 等温线模型和二级反应。根据热力学特性，Cu 在 IIP 上的吸附是一个吸热、自发的过程。与 NIP 相比，印迹聚合物对 Cu 吸附具有更好的容量和选择性，IIP 和 NIP 的最大去除率分别为 96.02%和 74.3%。此外，研究表明，离子印迹技术可能是一种有前途的技术，用于制备选择性吸附剂，以在多种竞争金属（Co、Cd、Ni、Zn、Fe 和 Pb）的介质中分离和预浓缩金属。这种新型 Cu-IIPs 的最重要的一点是显示出高达 8 个循环的优异可重复使用性，并且摄取能力略有下降。
