Enhanced adsorption performance of polypyrrole composite electrode with ionic liquid doped for low concentration heavy metals in CDI
Enhanced adsorption performance of polypyrrole composite electrode with ionic liquid doped for low concentration heavy metals in CDI
复制标题
离子液体掺杂聚吡咯复合电极增强CDI中低浓度重金属吸附性能
DOI：
10.1016/j.jece.2022.109028
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发表时间：
2022
影响因子：
7.7
通讯作者：
Juanqin Xue
中科院分区：
文献类型：
--
作者：
Yuehan Wang;Yujie Zhang;Ning Cai;Juanqin Xue
近年来，电容去离子(CDI)作为一种节能高效的废水处理技术备受关注，电极材料在其中扮演着重要的角色。本文采用电化学沉积法制备了离子液体(1-乙基-3-甲基咪唑四氟硼酸酯)掺杂复合电极材料(PPy-IL/CS/CNT)，并将其应用于重金属离子废水的吸附。与PPy/CS/CNT相比，由于IL的掺杂，PPy-IL/CS/CNT的比电容和比表面积分别提高了358.76和79.99nm2/g，大大改善了聚吡咯/CS/碳纳米管的团聚现象。经过1000次循环后，比电容衰减率仅为13.51%，说明所制备的材料具有良好的循环稳定性。PPy-IL/CS/CNT对100g/L Cu2+溶液的吸附量可达35.84g/g，是PPy/CS/CNT的近2倍，此外，PPy-IL/CS/CNT对Ag+(26.43g/g)和Fe3+(37.82g/g)的吸附也相当可观。因此，本研究为CDI技术处理重金属离子废水的产业化提供了有效的依据和新的视角。
Recently, capacitance deionization (CDI) has attracted much attention as an energy-saving and high-efficiency wastewater treatment technology, in which electrode materials play a significant role. In this work, ionic liquid (1-ethyl-3-methylimidazole tetrafluoroborate)-doped composite electrode materials (PPy-IL/CS/CNT) were prepared by electrochemical deposition and applied in the heavy metal ions wastewater adsorption. Compared with PPy/CS/CNT, PPy-IL/CS/CNT has improved the specific capacitance (358.76 F/g) and specific surface (79.99 m2/g) because of the doping of IL, which substantially improves the agglomeration phenomenon in the morphology. After 1000 cycles of CV, the specific capacitance decay is only 13.51%, which shows that the prepared material has excellent cycling stability. The adsorption of PPy-IL/CS/CNT can reach 35.84 mg/g for 100 mg/L Cu2+solution, which is nearly 2 times as much as PPy/CS/CNT, in addition, the adsorption of Ag+(26.43 mg/g) and Fe3+(37.82 mg/g) by PPy-IL/CS/CNT is also pretty impressive. Therefore, this study presents an effective basis and new sight into the industrialization of CDI technology for the treatment of heavy metal ion wastewater.