School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou, 221116, People's Republic of China.
School of Chemical Engineering, The University of Queensland, St. Lucia, QLD, 4072, Australia.
Environ Sci Pollut Res Int. 2019 Apr;26(11):10987-10999. doi: 10.1007/s11356-019-04436-3. Epub 2019 Feb 20.
Removal of the heavy metal ions in aqueous solution is an important technology for waste water treatment. The effects of using ultrasonic and microwave on synthesizing Pb, Zn, and Cu imprinted mesoporous adsorbents (Pb-IMA-UM, Zn-IMA-UM, and Cu-IMA-UM) and their dynamic adsorption properties were studied. The microstructure and composition of the ion-imprinted mesoporous adsorbents were discussed in detail by TEM, FTIR, N adsorption-desorption, XRD, and EDS. The pore sizes of mesoporous absorbents were improved more uniformly by using ultrasonic agitation than magnetic stirring. The elution efficiency of imprinting ions can be enhanced by microwave elution. Prepared Pb-IMA-UM, Zn-IMA-UM, and Cu-IMA-UM were used for dynamic adsorption study of heavy metals. The detected optimal feed rate was 20.0 mL/min and the influent concentration was 60 mg/L; the equilibrium adsorption capacities of Pb-IMA-UM, Cu-IMA-UM, and Zn-IMA-UM could reach 198 mg/g, 51.5 mg/g, and 57.3 mg/g, respectively. The dynamic regeneration performance of the adsorbent was also investigated with the Cu-IMA-UM sample. The adsorption rate remained above 89% after five dynamic regeneration experiments. At last, the actual wastewater from an electroplating industry was used as the research object. Three groups of dynamic adsorption coefficient contours of Pb-IMA-UM, Zn-IMA-UM, and Cu-IMA-UM were obtained when influents flowed into three adsorption columns separately. The experimental results showed that an ion-imprinted adsorbent had a much better adsorption capacity of imprinted ions under the various metals mixed conditions.
去除水溶液中的重金属离子是废水处理的一项重要技术。研究了超声和微波对合成 Pb、Zn 和 Cu 印迹介孔吸附剂（Pb-IMA-UM、Zn-IMA-UM 和 Cu-IMA-UM）及其动态吸附性能的影响。通过 TEM、FTIR、N 吸附-解吸、XRD 和 EDS 详细讨论了离子印迹介孔吸附剂的微观结构和组成。与磁搅拌相比，超声搅拌更均匀地提高了介孔吸附剂的孔径。微波洗脱可以提高印迹离子的洗脱效率。制备的 Pb-IMA-UM、Zn-IMA-UM 和 Cu-IMA-UM 用于重金属的动态吸附研究。检测到的最佳进料速率为 20.0 mL/min，进水浓度为 60 mg/L；Pb-IMA-UM、Cu-IMA-UM 和 Zn-IMA-UM 的平衡吸附容量分别可达 198 mg/g、51.5 mg/g 和 57.3 mg/g。还研究了吸附剂的动态再生性能，Cu-IMA-UM 样品在五次动态再生实验后吸附率仍保持在 89%以上。最后，将电镀工业的实际废水作为研究对象。当进水分别流入三个吸附柱时，获得了三组 Pb-IMA-UM、Zn-IMA-UM 和 Cu-IMA-UM 的动态吸附系数轮廓。实验结果表明，在各种金属混合条件下，印迹吸附剂对印迹离子具有更好的吸附能力。
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