Department of Chemistry, College of Science, University of Raparin, Sulaymaneyah, Iraq.
Department of Chemistry, College of Education, Salahaddin University, Erbil, Iraq.
Environ Technol. 2024 May;45(12):2335-2347. doi: 10.1080/09593330.2022.2056086. Epub 2022 Apr 7.
The new adsorbent was prepared by mixing cellulose with dicyclohexyl-18- crown-6 via microwave irradiation method and it was used to remove lead ions from aqueous solution. In contrast to the traditional way (in which grafted polymers are produced by using chemical-free radical producers), this method is rapid, reproducible, and gives a high-quality product. Different physicochemical techniques such as FTIR, SEM, and XRD and TGA were used for the characterization of the produced adsorbent. Based on the ANOVA statistical value, the adsorption of Pb ion onto grafted cellulose has been found to be significant, with very low probability () values (<0.001). The pH and initial concentration were observed to be the most significant factors that affected the Pb ion removal from the analysis of variance. Pseudo-second-order and Langmuir equations were applied to the adsorption of Pb ion and under the optimized conditions, the maximum absorption capacity in modified cellulose of Pb was 58.3 mg/g. Various factors which affect metal ion adsorption, including temperature, power of hydrogen, shaking time, adsorbent quantity, and metal ions concentration were studied. More importantly, the adsorbent could be reused by using 0.1 M nitric acid.
新型吸附剂是通过微波辐射法将纤维素与二环己基-18-冠-6 混合制备的，用于从水溶液中去除铅离子。与传统方法（通过使用无自由基引发剂的化学接枝聚合物生产）相比，该方法快速、可重复，且产物质量高。采用 FTIR、SEM、XRD 和 TGA 等不同的物理化学技术对制备的吸附剂进行了表征。基于方差分析（ANOVA）统计值，发现 Pb 离子在接枝纤维素上的吸附具有显著效果，概率（）值非常低（<0.001）。pH 值和初始浓度被观察为影响 Pb 离子去除的最显著因素。对 Pb 离子的吸附应用了伪二阶和朗缪尔方程，在优化条件下，改性纤维素对 Pb 的最大吸附容量为 58.3 mg/g。研究了影响金属离子吸附的各种因素，包括温度、氢离子强度、振荡时间、吸附剂用量和金属离子浓度。更重要的是，吸附剂可以使用 0.1 M 硝酸重复使用。
