School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China.
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China; Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Normal University, Wuhu 241002, Anhui, China.
J Hazard Mater. 2023 Jan 5;441:129917. doi: 10.1016/j.jhazmat.2022.129917. Epub 2022 Sep 8.
Quick and precise recovery of palladium (Pd) from electronic waste remains a serious task, owing to the strong acid and complexity of chemical compounds in leachate. Here, bioinspired construction of magnetic nano stirring rod with radially aligned dual mesopores and abundant 8-aminoquinoline (MNSR-DM-AQ) is proposed for selective and rapid extraction of Pd(II) from highly acidic sample solutions. Benefit from the unique dual mesoporous (12.4 nm and 3.6 nm) and the stirring motion under an external magnetic field, MNSR-DM-AQ possesses enhanced adsorption capacity and kinetics, achieving 11.62 mg g (97.2 % of the maximum adsorption capacity) in 15 min. Distribution coefficient (K = 299.0 mL g), separation factor (α above 25.54) and concentration factor (CF = 230.2 mL g) reveal the excellent selectivity of MNSR-DM-AQ towards Pd(II) when comparing with the coexisting ions (Ca(II), Co(II), Cu(II), Fe(II), Mg(II), Ni(II), Pb(II), Zn(II)). The adsorption mechanisms of MNSR-DM-AQ are ion exchange and chelation due to a strong affinity between Pd(II) and N. Meanwhile, 96.82 % of the captured Pd(II) can be easily eluted within 15 min, and the adsorption capacity remains stable after five adsorption-desorption cycles. It is worthwhile to mention that MNSR-DM-AQ exhibits a high adsorption capacity of 8.39 mg g from leachate of abandoned high-voltage patch capacitor, which is greatly desired in Pd(II) extraction from electronic waste.
从电子废物中快速准确地回收钯（Pd）仍然是一项艰巨的任务，这是由于浸出液中存在强酸和复杂的化合物。在这里，提出了一种受生物启发的构建具有径向排列的双介孔和丰富 8-氨基喹啉（MNSR-DM-AQ）的磁性纳米搅拌棒的方法，用于从高酸度样品溶液中选择性和快速提取 Pd(II)。受益于独特的双介孔（12.4nm 和 3.6nm）和在外磁场下的搅拌运动，MNSR-DM-AQ 具有增强的吸附能力和动力学，在 15 分钟内达到 11.62mg g（最大吸附容量的 97.2%）。分配系数（K=299.0 mL g）、分离因子（α大于 25.54）和浓缩因子（CF=230.2 mL g）表明，与共存离子（Ca(II)、Co(II)、Cu(II)、Fe(II)、Mg(II)、Ni(II)、Pb(II)、Zn(II)）相比，MNSR-DM-AQ 对 Pd(II)具有优异的选择性。MNSR-DM-AQ 的吸附机制是离子交换和螯合，因为 Pd(II)和 N 之间具有很强的亲和力。同时，96.82%的捕获的 Pd(II)可以在 15 分钟内轻松洗脱，并且在五次吸附-解吸循环后吸附容量保持稳定。值得一提的是，MNSR-DM-AQ 从废弃高压贴片电容器的浸出液中表现出 8.39mg g 的高吸附容量，这在从电子废物中提取 Pd(II)方面是非常理想的。
