Key Laboratory for Special Functional Aggregate Materials of Education Ministry, School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, P. R. China.
Monitoring Center for Estuary Ecological Environment of Dongying City Ecological Environment Bureau, Shandong Province, Dongying, 257200, P. R. China.
Environ Sci Pollut Res Int. 2024 Jul;31(33):46038-46051. doi: 10.1007/s11356-024-34209-6. Epub 2024 Jul 9.
Heavy metals are highly toxic and nonbiodegradable, posing a serious threat to the water environment and human beings. Therefore, it is crucial to develop a highly efficient adsorbent that is easy to recover and separate for the removal of heavy metals. In this paper, nitrogen-doped magnetic carbon (NC-67) was prepared by carbonization and hydrochloric acid treatment using cobalt-containing MOF (ZIF-67) as precursor. Then, polyaniline (PANI) was grown directly on NC-67 with high specific surface area by in situ polymerization to prepare polyaniline-coated nitrogen-doped magnetic carbon (NC-67@PANI), which was characterized by XRD, SEM, TEM and VSM, etc. and used for the removal of Cr(VI)from wastewater. The experimental results showed that the adsorption process of Cr(VI) by NC-67@PANI was spontaneous and endothermic, which conformed to the pseudo-second-order model and Freundlich adsorption isotherm model. Due to the synergistic effect of adsorption and reduction, the experimental adsorption capacity of NC-67@PANI for Cr(VI) was 410.2 mg/g. NC-67@PANI maintained a removal efficiency of 65.8% for Cr(VI) after five cycles. In addition, NC-67@PANI had good magnetism and was easy to separate under external magnetic field. The excellent adsorption capacity and easy separation characteristics of NC-67@PANI indicate that it is a promising adsorbent for Cr(VI) removal from wastewater.
重金属具有高毒性和不可生物降解性，对水环境和人类构成严重威胁。因此，开发一种高效的吸附剂，易于回收和分离，对于去除重金属至关重要。本文以含钴 MOF（ZIF-67）为前驱体制备氮掺杂磁性碳（NC-67），经过碳化和盐酸处理。然后，通过原位聚合在具有高比表面积的 NC-67 上直接生长聚苯胺（PANI），制备出具有高比表面积的氮掺杂磁性碳负载聚苯胺（NC-67@PANI），并用 XRD、SEM、TEM 和 VSM 等进行了表征，并用于去除废水中的 Cr(VI)。实验结果表明，NC-67@PANI 对 Cr(VI)的吸附过程是自发和吸热的，符合准二级动力学模型和 Freundlich 吸附等温线模型。由于吸附和还原的协同作用，NC-67@PANI 对 Cr(VI)的实验吸附容量为 410.2 mg/g。NC-67@PANI 在五次循环后仍保持 65.8%的 Cr(VI)去除效率。此外，NC-67@PANI 具有良好的磁性，在外磁场作用下易于分离。NC-67@PANI 具有优异的吸附容量和易于分离的特性，表明它是一种很有前途的去除废水中 Cr(VI)的吸附剂。
