Jamoussi Bassem, Chakroun Radhouane, Al-Mur Bandar A, Halawani Riyadh F, Aloufi Fahed A, Chaabani Anis, Aljohani Naif S
Department of Environment, Faculty of Environmental Sciences, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
Department of Hydrology and Water Resources Management, Faculty of Environmental Sciences, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
Polymers (Basel). 2023 Sep 21;15(18):3847. doi: 10.3390/polym15183847.
In this study, a novel technique is introduced that involves the combination of an ion-imprinted polymer and solid-phase extraction to selectively adsorb lithium ions from reverse osmosis brine. In the process of synthesizing ion-imprinted polymers, phthalocyanine acrylate acted as the functional monomer responsible for lithium chelation. The structural and morphological characteristics of the molecularly imprinted polymers and non-imprinted polymers were assessed using Fourier transform infrared spectroscopy and scanning electron microscopy. The adsorption data for Li on an ion-imprinted polymer showed an excellent fit to the Langmuir isotherm, with a maximum adsorption capacity (Qm) of 3.2 mg·g. Comprehensive chemical analyses revealed a significant Li concentration with a higher value of 45.36 mg/L. Through the implementation of a central composite design approach, the adsorption and desorption procedures were systematically optimized by varying the pH, temperature, sorbent mass, and elution volume. This systematic approach allowed the identification of the most efficient operating conditions for extracting lithium from seawater reverse osmosis brine using ion-imprinted polymer-solid-phase extraction. The optimum operating conditions for the highest efficiency of adsorbing Li were determined to be a pH of 8.49 and a temperature of 45.5 °C. The efficiency of ion-imprinted polymer regeneration was evaluated through a cycle of the adsorption-desorption process, which resulted in Li recoveries of up to 80%. The recovery of Li from the spiked brine sample obtained from the desalination plant reverse osmosis waste through the ion-imprinted polymer ranged from 62.8% to 71.53%.
在本研究中，引入了一种新技术，该技术涉及离子印迹聚合物与固相萃取相结合，以从反渗透浓盐水中选择性吸附锂离子。在合成离子印迹聚合物的过程中，丙烯酸酞菁作为负责锂螯合的功能单体。使用傅里叶变换红外光谱和扫描电子显微镜评估了分子印迹聚合物和非印迹聚合物的结构和形态特征。离子印迹聚合物对锂的吸附数据与朗缪尔等温线拟合良好，最大吸附容量（Qm）为3.2 mg·g。综合化学分析显示锂浓度显著，较高值为45.36 mg/L。通过实施中心复合设计方法，通过改变pH值、温度、吸附剂质量和洗脱体积，系统地优化了吸附和解吸程序。这种系统方法使得能够确定使用离子印迹聚合物-固相萃取从海水反渗透浓盐水中提取锂的最有效操作条件。吸附锂效率最高的最佳操作条件确定为pH值8.49和温度45.5°C。通过吸附-解吸过程的循环评估了离子印迹聚合物的再生效率，锂回收率高达80%。通过离子印迹聚合物从海水淡化厂反渗透废物获得的加标浓盐水样品中锂的回收率在62.8%至71.53%之间。
