TY - JOUR
T1 - Effective removal of trace arsenic from groundwater by capacitive deionization
AU - Cai, Liuke
AU - Xu, Bin
AU - Gan, Yonghai
AU - Liu, Yiqun
AU - Chen, Zhihao
AU - Yang, Wenzhong
AU - Zhang, Jie
AU - Jiang, Kaixiang
N1 - Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2024/2/1
Y1 - 2024/2/1
N2 - In this paper, functionalized CNTs and Fe3O4 were compounded by co-precipitation method and the binder-free capacitive deionization (CDI) electrodes were innovative prepared by electrophoretic deposition (EPD) technique. The effects of applied voltage, flow rate and solution pH on the adsorption capacity of arsenic were investigated. The results confirmed that introduction of different functional groups (–COOH, -SO3H and -PO3H2) and composite transition metal oxide (Fe3O4) led to the materials not only with enhanced hydrophilicity but also with higher capacitance. The CDI test showed that trace arsenic can be effective treated to less 2 μg/L, which satisfied the World Health Organization (WHO) drinking water standard (below 10 μg/L). The CNTs-X@Fe3O4 electrode was found to maintain specific adsorption of arsenic through selectivity experiments. In addition, the combined electro-sorption and chemisorption effectively produce higher adsorption capacity, faster adsorption rate and high selectivity. Therefore, the electrode prepared by EPD has a high prospect of application in arsenic removal by CDI.
AB - In this paper, functionalized CNTs and Fe3O4 were compounded by co-precipitation method and the binder-free capacitive deionization (CDI) electrodes were innovative prepared by electrophoretic deposition (EPD) technique. The effects of applied voltage, flow rate and solution pH on the adsorption capacity of arsenic were investigated. The results confirmed that introduction of different functional groups (–COOH, -SO3H and -PO3H2) and composite transition metal oxide (Fe3O4) led to the materials not only with enhanced hydrophilicity but also with higher capacitance. The CDI test showed that trace arsenic can be effective treated to less 2 μg/L, which satisfied the World Health Organization (WHO) drinking water standard (below 10 μg/L). The CNTs-X@Fe3O4 electrode was found to maintain specific adsorption of arsenic through selectivity experiments. In addition, the combined electro-sorption and chemisorption effectively produce higher adsorption capacity, faster adsorption rate and high selectivity. Therefore, the electrode prepared by EPD has a high prospect of application in arsenic removal by CDI.
KW - Arsenic removal
KW - Binder-free electrode
KW - Capacitive deionization
KW - Carbon nanotubes
KW - Selective adsorption
UR - http://www.scopus.com/inward/record.url?scp=85175551443&partnerID=8YFLogxK
U2 - 10.1016/j.seppur.2023.125419
DO - 10.1016/j.seppur.2023.125419
M3 - 文章
AN - SCOPUS:85175551443
SN - 1383-5866
VL - 330
JO - Separation and Purification Technology
JF - Separation and Purification Technology
M1 - 125419
ER -