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Simultaneously-efficient electro-sorption of Pb(Ⅱ), Cu(Ⅱ) and Cd(Ⅱ) by Cu2+ modified superactive carbons

[Display omitted] •The Cu2+-modified activated carbon (0.2-Cu-SAC) showed excellent adsorption performance for multiple heavy metal ions (Pb2+, Cu2+, and Cd2+) simultaneously.•The ion removal percentage was 95.2 %, 93.9 %, and 92.1 % in 70 mg/L of PbCl2, CuCl2 and CdCl2 solutions, respectively.•The...

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Published in:Separation and purification technology 2024-06, Vol.338, p.126604, Article 126604
Main Authors: Zhang, Zongbo, Li, Jin, Meng, Nan, Song, Shiliang, Zhu, Qingqing, Li, Dawei, Gong, Liang, Ding, Yan, Zhang, Rui, Shi, Xiaoxu
Format: Article
Language:English
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Summary:[Display omitted] •The Cu2+-modified activated carbon (0.2-Cu-SAC) showed excellent adsorption performance for multiple heavy metal ions (Pb2+, Cu2+, and Cd2+) simultaneously.•The ion removal percentage was 95.2 %, 93.9 %, and 92.1 % in 70 mg/L of PbCl2, CuCl2 and CdCl2 solutions, respectively.•The saturated adsorption capacities were 412 mg/g, 368 mg/g, and 345 mg/g in 70 mg/L of PbCl2, CuCl2 and CdCl2 solutions, respectively.•0.2-Cu-SAC displayed excellent cycling stability, with nearly 100% original adsorption capacity retention after 20 cycles.•The adsorption selectivity of 0.2-Cu-SAC for the ions followed the order of Pb2+ > Cu2+ > Cd2+. Capacitive deionization (CDI) is promising for deeply removing heavy metal ions from polluted water. The performance of CDI is largely determined by electrode material. Activated carbon (AC) as electrode material has many advantages, but no reported ACs display high adsorption performance for multiple heavy-metal ions simultaneously. In this study, a novel Cu2+-modified AC was prepared and used to remove ions from single or multiple heavy-metal-ion solutions. In single heavy-metal-ion solution, the ion removal percentage was 95.2%, 93.9%, and 92.1% in 70 mg/L of PbCl2, CuCl2, and CdCl2 solutions, respectively, exceeding the corresponding values reported for carbon electrode materials. This is mainly attributed to its developed pore structure (SBET = 3287 m2/g, Vtot = 2.38 cm3/g, and Vmic = 1.05 cm3/g) and abundant O-containing functional groups. The saturated adsorption capacities for Pb2+, Cu2+, and Cd2+ were 412 mg/g, 368 mg/g, and 345 mg/g, respectively. The carbon also displayed excellent cycling stability, with nearly 100% adsorption capacity retention after 20 cycles. In multiple heavy-metal-ion solution, the adsorption capacity and adsorption selectivity followed the order of Pb2+ (59.92 mg/g) > Cu2+ (32.94 mg/g) > Cd2+ (25.12 mg/g). This study provides a carbon with unique properties for simultaneously-efficient removing Pb2+, Cu2+, and Cd2+.
ISSN:1383-5866
1873-3794
DOI:10.1016/j.seppur.2024.126604